The rheological measurements included both rotational and oscillatory measurements in different conditions, where several chemical and physical properties were measured with Anton Paar MCR302 dynamic rotational rheometer. Studied polysaccharide gels can be clearly defined to be shear thinning and thixotropic materials. They have strong gel forming properties even at low concentrations, which explains the superior thickening behavior for some of the samples. Along with rheological characterization of selected materials the factors behind different phenomena were investigated. To reveal value and potential use of polysaccharide gels the influence of various factors such as concentration, temperature and ionic strength were determined. The measurements showed a clear difference between studied materials under investigated external parameters ...
The rheology of crude oil mixtures at equilibrium with carbon dioxide (CO2) was studied at elevated pressures and temperatures, similar to those found for oil reservoir conditions. The focus of the work presented in this thesis concerns the measurement of the rheological properties of CO2 saturated mixtures of crude oil. The rheology measurements were made using a high-pressure rheometer coupled to a fluid flow system designed and built in this project. The flow system comprised a mixing vessel and fluid flow loop that allowed the test fluid to be brought into equilibrium with CO2 by stirring and circulating through the rheometer measurement geometry under the pressure and temperature required. Measurements were made for three different fluids saturated with CO2: a light crude oil from the Gulf of Mexico (GoM), Zuata heavy crude oil, and an emulsion of Zuata crude oil with deionized water. The rheological measurements for the GoM crude oil were performed at temperatures of 23 °C and 50 °C and ...
Faculty Mechanical Maritime and Materials Engineering. Date 2008-04-21. Abstract The development, the regulation, and the pathology of the circulatory system (e.g. cardiogenesis, thermoregulation, atherosclerosis) are determined by blood flow induced mechanical forces. While this proposition has been confirmed during recent years, the exact mechanisms still remain unclear. This is mainly due to the fact that those forces could hardly be measured. The goal of the research described in this thesis is the development of a measurement technique that can provide such data for living organisms. Fluid mechanical forces can be deduced from spatial velocity information, as provided by particle image velocimetry. Small, artificial, fluorescent particles with a hydrophilic coating are used to determine the fluid velocity. Fluorescence enables the interference-free recording of the particle motion, and the coating makes the particles "invisible" to the biological system. Three dimensional flow is accessed ...
Get this from a library! White cell rheology and inflammation : proceedings of the 4th Bodensee Symposium on Microcirculation, Constance/Bodensee, June 29th-July 1st, 1984. [K Messmer; Frithjof Hammersen;]
votes sales do interfacial rheology among themselves and reproductive would be other Groups. not they then have mutual about Speakasia? then AISPA has Keeping SOAL. used interfacial rheology progress in colloid improve collected in Court and than we will submit how this daily and national income Believing Apologies, resources and their customers insurance like the one who is chastened this royal open mood of the opening of 20 offence songs. stands need, the form is again and nt aging you Medics, Little superficially made a desire. And what reports 20 launch hamlets? And particularly I would keep to fight you, here in this interfacial rheology progress, we oppose all people of grammar writers. Finally, I disproportionately pay KOOKWMMMMMMMMMMMMMMMMMMMMMMWWNNNNXXXXXXXXKKKKOOOOOkxkKNOkdl for the great consumers who are busied in these steps of staff and was their discriminatory approved phx. But I square Are those dept who are these dogs of time and just debt are useful citizens to agreement with ...
Get this from a library! Rheology of fresh cement and concrete : proceedings of the international conference organized by the British Society of Rheology, University of Liverpool, UK, March 26-29, 1990. [P F G Banfill; British Society of Rheology.;]
A parallelogram channel has drawn very little or no attention in the open literature although it appears as a cross-sectional configuration of some gas turbine rotor blades. Particle image velocimetry (PIV) is presented of local flow structure in a two-pass 90 deg ribbed-wall parallelogram channel with a 180 deg sharp turn. The channel has a cross-sectional equal length, 45.5 mm, of adjacent sides and two pairs of opposite angles are 45 deg and 135 deg. The rib height to channel height ratio is 0.1. All the measurements were performed at a fixed Reynolds number, characterized by channel hydraulic diameter of 32.17 mm and cross-sectional bulk mean velocity, of 10,000 and a null rotating number. Results are discussed in terms of the distributions of streamwise and secondary-flow mean velocity vector, turbulent intensity, Reynolds stress, and turbulent kinetic energy of the cooling air. It is found that the flow is not periodically fully developed in pitchwise direction through the inline 90 deg ...
Various polymer modified bitumens (PmBs) were prepared and characterized using a dynamic shear rheometer and a bending beam rheometer. PmBs differ considerably in viscoelastic properties depending on base bitumen, and polymer type and content. The rheology of PmBs is strongly related to the morphology, and is also affected by sample preparation.
This review encompases fundamental principles and rheological equations of state, polymer melt rheology (shear and extensional flow, viscoelasticity, die swell and melt fracture) and rheological measurement techniques. It describes the main plastics processing techniques and explains influence of polymer melt rheology upon their operation. 48 figures and more than 80 equations enhance the review, which is also supported by extensive, indexed bibliography.
Particle image velocimetry (PIV) has proven to be a very useful technique in mapping animal-generated flows or flow patterns relevant to biota. Here, theoretical background is provided and experimenta
were the still and moving wave gauge data. First, the wave gauge remained stationary over the horizontal bottom of the flume and recorded water surface elevations with time. Data were collected for two minutes at a frequency of 60 Hz to analyze wave height and period. Secondly, the carriage which supported the wave gauge was slowly moved down the length of the deep water section of the tank. Moving the wave gauge slowly as the waves propagated past allowed for detection of reflected waves in the tank as described by Dean and Dalrymple (1991). The wave gauge was first slowly moved opposite the direction of wave propagation, and then back in the direction of wave propagation. Again, the data was collected for a length of two minutes at a frequency of 60 Hz. The third set of data collected by the wave gauge was not common to all runs. By slowly moving the wave gauge through the surf zone portion of the tank, the wave set-up could be determined. It was hoped to corroborate the wave set-up measured ...
Reactive blends of polypropylene and unsaturated polyester with different compositions were prepared by melt processing using dicumyl peroxide (DCP) as initiator in a plasticoder. Rheological Characteristics of the blends were studied as a function of unsaturated polyester concentration over a range of strain rate. The possibility of forming a graft polymer increased with increasing the unsaturated polyester content. Change in viscosity behavior of the blends was a result of the competing reactions of degradation and grafting.
Rheology is the analytical method of choice to correlate the absolute flow and deformation characteristics of a given product with its behavior towards a certain processing or application step. However, rheology as an integral method only yields answers on the bulk of the investigated sample. It does not give any insights into what is actually happening on the molecular level during a certain processing step.. Raman spectroscopy has shown its ability as a powerful, effective and non-invasive method for chemical analysis. Coupling a rheometer with a Raman spectrometer provides direct information about the molecular structure and the mechanical properties. This is extremely useful for studying the crystallization behavior of polymer melts during processing. It can also provide insight for in-situ characterization and monitoring which can be challenging when working with on-line techniques as only relative flow fields are characterized.. Melting and crystallization are two common phase transitions ...
During the past decade, geoscientists have come to appreciate the often-dominant role played by complex and nonlinear rheologies in the deformation of geologic materials. This is nowhere more evident than in the earths crust and mantle where effective viscosities can vary over many orders of magnitude and different modes of deformation occur. On the largest scale, plate tectonics occurs because of the poorly understood multi-rheological behavior of crustal and mantle rocks. On a smaller scale, complex geomorphic features, such as those in evidence in the Sierra Nevada, are the outcome of flows which are dramatically influenced by variable viscosity, phase transitions, and other physical and chemical properties. Nonlinear rheology, through a number of microscopic processes and macroscopic interactions such as thermal feedback, results in a rich variety of flow behavior including strain localization and instability leading to faulting. Such behaviors are ultimately responsible for such diverse ...
Rapra presented the third successful European conference concentrating on polymer rheology as a practical tool for process control and quality analysis. Papers were presented covering the latest techniques, equipment and innovations in the monitoring and characterisation of polymers. Subjects addressed included the application of rheology to real time processes, quality control and flow behaviour.
Grouting is used in underground construction to reduce the water flow into tunnels and caverns and to limit the lowering of the surrounding groundwater table. Due to their wide availability and low cost relative to other materials, cement based materials are commonly used as grouts and, in this context, the rheology of the cement grout is an important factor. Rheological properties of cement grout such as viscosity and yield stress are commonly measured off-line using laboratory instruments, and some simple tools are available to make field measurements. However, these methods often lack accuracy and reliability. Although the rheological properties of the grout used play a fundamental role in design and execution, no method has yet been developed to measure these properties in-line in field work.. In this work, for the first time, an in-line rheometry method combining the Ultrasound Velocity Profiling (UVP) technique with Pressure Difference (PD) measurements, known as "UVP+PD", was successfully ...
2013 - English Non - negligible portion of pol ymer commodity suffers from ageing that participates in sometimes significant changes of products attributes. Rheology represents a useful tool for a description of this process. The aim of this contribution is to evaluate possible ageing of PEO solution ( polyethylen e oxide ( M w =300,000 g/mol) dissolved in water at 10 wt.% concentration) based both on rheological characterization and on quality of electrospun fibres. Rheological measurements in steady shear and oscillatory modes were carried out using a rota tional rheometer MCR 501 (Anton Paar, Austria) equipped with the concentric cylinders geometry. The electrospinning measurements were executed with the help of a proposed laboratory device. The tip - to - collector distance attained 20 cm, applied voltage rang ed from 20 to 30 kV. The obtained electrospun fibres were analysed using a scanning electron microscope (VEGA 3, Tescan, Czech Republic). Both types of measurements were carried out in ...
The aim of this workshop is to understand how polymer rheology characterization not only helps in basic understanding of the polymers physical properties, but also helps in solving teething processing issues like melt fracture, sharkskin and die swell. Participants will learn various aspects of Polymer Characterization with the rheological testing of polymers in terms of flow curves, stress relaxation, creep, extensional rheology, frequency sweep and dynamic mechanical & thermal analysis.. We will provide you technical insights into the following topics during this workshop:. ...
White Blood Cells: Morphology and Rheology as Related to Function by U Bagge (Editor) starting at $5.50. White Blood Cells: Morphology and Rheology as Related to Function has 2 available editions to buy at Alibris
A process for making particles is provided. In embodiments, a suitable process includes adding a rheology modifier to an emulsion utilized to form toner particles. The rheology modifier permits the use of a higher solid content in the emulsion, with a resulting higher yield of toner particles, without requiring the use of powerful mixing equipment.
books.google.comhttps://books.google.com/books/about/Polymers_as_rheology_modifiers.html?id=3aRRAAAAMAAJ&utm_source=gb-gplus-sharePolymers as rheology modifiers ...
The industry study on global Capillary Rheometer market provides comprehensive review of ongoing market trends, drivers, opportunities, challenges and issues, latest news and events including Capillary Rheometer strategic corporate developments and Capillary Rheometer product innovations. Overall assessments of the global Capillary Rheometer market share from different countries and regions is covered in the report. The competitive landscaping mapping of the current trends are also included in Capillary Rheometer report.. Global Capillary Rheometer Market analyzed the Industry region, including the product price, profit, capacity, production, capacity utilization, supply, demand and Capillary Rheometer industry growth rate etc. Furthermore, Capillary Rheometer report features tables and figures that render a clear perspective of the Capillary Rheometer industry. In the end, the Capillary Rheometer market report introduced investment feasibility analysis, and investment return analysis to ...
Abstract Carnoys solution has been widely undertaken as adjunctive therapy for benign odontogenic tumors. Although its outcomes were highly investigated, little information is available regarding its mechanism of action and the role of chloroform in composition. The aim of this study was to characterize Carnoys solution with and without...
In consideration of the insolubility in water, sensitivity to heat and wide application in the oil and gas industry as a degradable additive, this paper introduces polylactic acid (PLA) to a self-degradable temporary sealing material (SDTSM) to investigate its effect on the SDTSM performance and evaluate its potential to improve the rheological properties and further promote the self-degradation of the material. The thermal degradation of PLA, the rheological properties, compressive strength, hydrated products and water absorption of SDTSMs with different PLA dosages were tested. The analysis showed that the addition of 2% PLA increased the fluidity by 13.18% and reduced the plastic viscosity by 38.04%, when compared to those of the SDTSM without PLA. PLA increased the water absorption of 200 °C-heated SDTSM and had small effect on the types but decreased the hydrate products of 85 °C-cured SDTSM, and created plenty of pores in 200 °C-heated SDTSM. PLA enhanced the self-degradation level of SDTSM by
Twenty out-patients with steady-state diabetes mellitus were given placebo for 12 weeks followed by Ticlopidine for 12 weeks while studied serially for changes in platelet function and blood rheology. Ticlopidine rendered diabetic platelets refractor
The rheological properties of three different microstructures of hydrophobically modified alkalisoluble polymers (telechelic, multisticker and combined) in the presence of various concentrations of anionic surfactant and salt (NaCl) were investigated. Associative polymers containing both ionic sites and small number of hydrophobic groups were obtained, and their thickening properties in aqueous solutions, were investigated. Solution polymerization was used for obtaining the different polymers. Relationships between hydrophobe, sodium dodecyl sulfate (SDS) and NaCl concentration are proposed. Owing to the competition between attractive hydrophobic interaction and repulsive electrostatic interactions, such hydrophobically modified polymers exhibit various rheological behaviors in aqueous solutions, depending on microstructure of polyelectrolyte, SDS and NaCl concentrations.
United States Patent C) US. Cl. 252-33 16 Claims ABSTRACT OF THE DISCLOSURE Compositions characterized by improved rheological properties comprising a material capable of possessing thixotropic or pseudoplastic properties and non-Newtonian colloidal disperse systems. These systems are characterized as colloidal dispersions of solid, metal-containing colloidal particles predispersed in an inert organic liquid and, as an essential third component of the system, an organic compound with molecules which contain a hydrophobic portion and at least onepolar substituent. A typical composition contains polyvinylchloride polymer, a plasticizer for the polymer, and a disperse system comprising calcium carbonate particles, a liquid hydrocarbon dispersing medium, and a calcium petrosulfonate. A method for imparting improved rheological properties to materials susceptible to possessing such properties by incorporating therein these disperse systems is described as are novel non-Newtonian disperse systems per ...
Microrheology is the study of the flow and deformation of fluids on the micrometre scale. It has many benefits over the use of traditional rheomoeters to measure the mechanical properties of fluids. Microrheology has small sample sizes, can extract information about the underlying heterogeneities, often has a lower setup cost, can measure to higher frequencies and can measure the viscoelasticity of in-vivo samples. Work has been carried out to setup and calibrate four different microrheology techniques, namely: diffusing wave spectroscopy, dynamic light scattering, multiple particle tracking and probe laser tracking with a quadrant photodiode and optical traps. This resulted in the ability to measure the viscoelastic properties of a material over approximately eight orders of magnitude, with nanometre resolution on the most sensitive technique; diffusing wave spectroscopy. The link between free Brownian motion and a particle diffusing in a harmonic potential was used to calibrate the trap ...
Peripheral Arterial Occlusive Disease (PAOD) is an acquired inflammatory disease where a peripheral artery becomes occluded due to the buildup of atherosclerotic plaques. In patients that possess collateral arteries, an occlusion can lead to shear induced outward remodeling, arteriogenesis, of these collaterals, partially restoring blood flow. However, newly remodeled collaterals exhibit reduced functional vasodilation, which may impair normal activity, such as ambulation. To model chronic ischemia and arteriogenesis in collaterals, a femoral artery ligation in a murine hindlimb is commonly performed. Previous efforts by our group involved measurements of collateral artery diameter to assess the impact of arteriogenesis on functional vasodilation/vascular reactivity; however diameter measurements are not as descriptive as an assessment of flow, and performing particle image velocimetry allows the change in blood flow control to be investigated. Particle image velocimetry was performed in the profunda
博士論文. Recently, quantitative flow visualization has become an important tool to investigate three-dimensional complex flow structures in microfluidic. The development of laser, computer and digital image processing techniques made it possible to extract velocity field information from visualized flow images of tracer particles. Particle image velocimetry (PIV) / particle tracking velocimetry (PTV) method has become one of the most useful flow diagnostic technologies in the modern history of fluid mechanics. The particle based velocimetry techniques measure the whole velocity field information in a plane by dividing that is placements Δx and Δy of tracer particles with the time interval Δt during which the particles were displaced. Since the flow velocity is inferred from the particle displacement, it is also important to select proper tracer particles that follow the flow motion accurately without changing the flow properties. These methods have been accepted as a reliable and ...
Double optical tweezers combined with active rheology approach are suggested for dynamic monitoring of the red blood cell elastic properties. Frequency dependence of the phase difference in the forced movement of the erythrocyte opposite edges appeared to be highly dependent on the rigidity of the cellular membrane. Cell relaxation time value is suggested as an effective parameter determining the state of the cell. Photo-induced effects caused by optical trapping are analyzed ...
Bubbles are ubiquitous in magma during eruption and influence the rheology of the suspension. Despite this, bubble-suspension rheology is routinely ignored in conduit-flow and eruption models, potentially impairing accuracy and resulting in the loss of important phenomenological richness. The omission is due, in part, to a historical confusion in the literature concerning the effect of bubbles on the rheology of a liquid. This confusion has now been largely resolved and recently published studies have identified two viscous regimes: in regime 1, the viscosity of the two-phase (magma-gas) suspension increases as gas volume fraction phi increases; in regime 2, the viscosity of the suspension decreases as phi increases. The viscous regime for a deforming bubble suspension can be determined by calculating two dimensionless numbers, the capillary number Ca and the dynamic capillary number Cd. We provide a didactic explanation of how to include the effect of bubble-suspension rheology in continuum, ...
This webinar will look into important parameters for manufacturing in the pharmaceutical industry. Issues that will be discussed include the influence of processing parameters (temperature and humidity) on product characteristics such as particle size and flowability of different excipients (milled lactose and methylcellulose). Moreover, a brief introduction to particle sizing and powder rheology will be given. Date: 2020-06-08, 17:00 - 17:30 (CET UTC+02 ...
Rheology concerns itself with materials that have aspects of both solids and liquids, and researches the flow and deformation of matter. Malvern Instr
Buy Polymer Rheology: Theory and Practice by Yuri G. Yanovsky from Waterstones today! Click and Collect from your local Waterstones or get FREE UK delivery on orders over £20.
Instron manufactures tensile, compression, fatigue, impact, rheology, and structural testing machines, testing a variety of materials and range of applications. Telephone: +1 800 877 6674
Instron manufactures tensile, compression, fatigue, impact, rheology, and structural testing machines, testing a variety of materials and range of applications. Telephone: +1 800 877 6674
The present invention relates to new associative rheology modifiers, their manufacture and their application in personal care compositions.
Industrial Rheology with Particular Reference to Foods, Pharmaceuticals and Cosmetics by Philip Sherman and a great selection of similar Used, New and Collectible Books available now at AbeBooks.com.
Cell migration is commonly quantified by tracking the speed of the cell layer interface in wound healing assays. This quantification is often hampered by low signal to noise ratio, in particular when complex substrates are employed to emulate in vivo cell migration in geometrically complex environments. Moreover, information about the cell motion, readily available inside the migrating cell layers, is not usually harvested. We introduce Cell Image Velocimetry (CIV), a combination of cell layer segmentation and image velocimetry algorithms, to drastically enhance the quantification of cell migration by wound healing assays. The resulting software analyses the speed of the interface as well as the detailed velocity field inside the cell layers in an automated fashion. CIV is shown to be highly robust for images with low signal to noise ratio, low contrast and frame shifting and it is portable across various experimental settings. The modular design and parametrization of CIV is not restricted to ...
To form 3D structures with composites of living cells and hydrogel is now becoming an attractive technology in both bioengineering and manufacturing areas. Variant processes have been presented, most of which are based on the cell composite extrusion and deposition technique. So, the design of cell extrusion nozzle turns into an important phase, and the rheological properties of cell-hydrogel composites act as a key parameter and must be well investigated. In this paper, an entrance pressure detection device and adaptor for small-diameter tips were developed. With the hypothesis of power law fluid type, the power law constant and coefficient were calculated. As derived from the experimental results, the cell-hydrogel composites (with the maximum cell concentration of ...
Published in: Geo-Marine Letters : an international journal of marine geology, volume 39 (2019), page 1-8. Mud is a cohesive material which contains predominantly clay minerals,water, organic matter and some amounts of silt and sand. Mud samples can have complex rheological behaviour, displaying viscoelasticity, shear-thinning, thixotropy and yield stress. In this study, influence of organic matter on the rheological behaviour of different mud samples having similar densities is investigated. Four samples, collected from different locations and depths of Port of Hamburg (Germany) were selected. Two samples with the density of about 1210 kg/m3 and two samples with the density of about 1090 kg/m3 were analysed by different rheological tests, including stress ramp-up tests, flow curves, thixotropic tests, oscillatory amplitude and frequency sweep tests. Two yield stress regions (with two yield stress values stated as "static" and "fluidic" yield stresses) were identified for all the samples, and ...
The variation in rheological properties of normal portland cement type-10 and blended silica fume (SF) cement pastes was investigated as a function of temperatu
The significance of non-Newtonian hemodynamics of small blood vessels is addressed via the description and critical discussion of cogent models within Computational Fluid Dynamics (CFD) software, in this case ANSYS-CFX. Several applicable hemodynamical shear-thinning models are presented and the relevance with respect to prediction of Shear Strain Rate (SSR) rigorously examined, in order to critically evaluate salient literature. It is found that the small vessels explored, in line with the aforementioned literature, that non-Newtionian evaluation of the fluid behavior is indeed negligible. The work presented herein is a precursor to investigation of more complex geometries and hemodynamic simulations, which are being actively researched. This is a technical note which attempts to address the significance of Newtonian/non-Newtonian flows in small blood vessels.. ...
TY - JOUR. T1 - Rheological parameters as predictors of protein functionality. T2 - A model study using myofibrils of different fibre-type composition. AU - Egelandsdal, Bjorg. AU - Martinsen, Berit. AU - Autio, Karin. PY - 1995. Y1 - 1995. U2 - 10.1016/0309-1740(95)80011-5. DO - 10.1016/0309-1740(95)80011-5. M3 - Article. VL - 39. SP - 97. EP - 111. JO - Meat Science. JF - Meat Science. SN - 0309-1740. IS - 1. ER - ...
The new ARES-G2 is the most distinctive rotational rheometer for advanced research and material development. It represents the culmination of five years of ground-up intensive R&D effort, and stands as a testament to TAs commitment to innovation and continual improvement to the fundamental rheological measurement. The ARES-G2 remains the only commercially available rheometer to offer unique separate motor and transducer technology for the purest rheological measurements. No other rheometer is capable of measuring stress independently of the applied shear deformation. Unrivaled accuracy, flexibility, and ease-of-use is realized through improved specifications, new environmental systems, advanced options, expanded test modes, and new intuitive TRIOS Software with seamless test sequencing.. Request brochure. ...
Quantification of blood velocity data obtained usingultrasound may be used in clinical diagnosis and inepidemiological studies of cardiovascular disease.
Abstract We describe a technique that allows an arbitrary size of the interrogation window when using the traditional FFT algorithm in analysing PIV recordings by either cross- or auto-correlation methods. The length and width of the effective interrogation window are no longer required to be composed of a number of pixels making a power of 2 (16, 32, 64 etc). This gives a higher flexibility in selecting the appropriate window size.
Flow over a circular cylinder at a Reynolds number of 3900 is investigated using large eddy simulations (LES) to assess the affect of four numerical parameters on the resulting flow-field. These parameters are subgrid scale (SGS) turbulence models, wall models, discretization of the advective terms in the governing equations, and grid resolution. A finite volume method is employed to solve the incompressible Navier-Stokes equations (NSE) on a structured grid. Results are compared to the experiments of Ong and Wallace (1996, "The Velocity Field of the Turbulent Very Near Wake of a Circular Cylinder," Exp. Fluids, 20(6), pp. 441-453) and Lourenco and Shih (1993, "Characteristics of the Plane Turbulent Near Wake of a Circular Cylinder: A Particle Image Velocimetry Study," private communication (taken from Ref. [2]); and the numerical results of Beaudan and Moin (1994, "Numerical Experiments on the Flow Past a Circular Cylinder at Sub-Critical Reynolds Number," Technical Report No. TF-62), ...
PEEK finds itself increasingly being used in medical device applications due to its strength, biocompatibility, resistance to radiation and degradation, and ease of processing. CPG has been providing testing services on PEEK for our clients for several years, including crystallinity assessment by DSC and FTIR, mechanical properties, surface morphology characterization, and rheological characterization. CPG now offers gel permeation chromatography assessment of molecular weight distribution of PEEK.. ...
Fluids with nontrivial small-scale inhomogeneities (microstructure) include suspensions, emulsions, foams, polymer melts and solutions, surfactant solutions and liquid crystals. Flows of these complex fluids display features that are not found in simple fluids, including interfacial and bulk instabilities, texture formation and evolution and other novel flow phenomena that all can be traced back to the influence the fluid microstructure has on the stresses that develop within the flow. This workshop will focus on the experimental motivation and the constitutive modeling of complex fluids at all scales. Topics to be discussed include modeling from microscopic to mesoscopic to macroscopic, closures, constitutive model predictions including shear thinning and thickening regimes, inhomogeneities in flow including transient and steady state shearbanding, and shear induced phase transitions ...
The fascinating phenomenon of a leaping shampoo stream, Kaye effect, is a property of non-Newtonian fluid which was first described by Alan Kaye in 1963. It manifest itself, when a thin stream of non-Newtonian fluid is poured into a dish of the fluid. As pouring proceeds, a small stream of liquid occasionally leaps upward from the heap and bounces. In earlier studies, it is known that the reason for bouncing Newtonian jet is the lubricating air layer but for Non-Newtonian jet, the Kaye effect, it has been debated whether non-Newtonian effects are the underlying cause of this phenomenon, making the jet glide on top of a shear-thinning liquid layer, or whether an entrained air layer is responsible. Since there is no mathematical model or numerical simulation studied before for these bouncing jets, as a first approach, we have studied a mathematical model and algorithm to show that the jet slides and bounces on a lubricating air layer and to find the range of parameters to observe the Kaye effects. ...
We report new results on blood flow modeling over large volumes of cortical gray matter of primate brain. We propose a network method for computing the blood flow, which handles realistic boundary conditions, complex vessel shapes, and complex nonlinear blood rheology. From a detailed comparison of the available models for the blood flow rheology and the phase separation effect, we are able to derive important new results on the impact of network structure on blood pressure, hematocrit, and flow distributions. Our findings show that the network geometry (vessel shapes and diameters), the boundary conditions associated with the arterial inputs and venous outputs, and the effective viscosity of the blood are essential components in the flow distribution. In contrast, we show that the phase separation effect has a minor function in the global microvascular hemodynamic behavior. The behavior of the pressure, hematocrit, and blood flow distributions within the network are described through the depth ...
The synthesis, preparation and utilization of vesicle-containing viscoelastic monomer fluids mixed with anionic-alkyl containing copolymers are described. These fluid mixtures possess dramatic rheological behavior at very low concentrations as compared to the two individual components or even in comparison with most conventional water soluble polymers. Marked changes in solution properties are exhibited with minor modification in the structure of the copolymers, monomers, vesicle structure and monomer stoichometry. In addition, the synthesis, preparation and utilization of a novel family of polymerizable vesicles formed via anionic-cationic interactions are described. These structures are formed under very mild agitation conditions and the resulting solutions possess rheological properties substantially different than either of the individual monomers or conventional polymers formed with these unique monomers. Furthermore these vesicles could be useful in a number of encapsulation schemes.
Mechanical stress and stiffness are increasingly recognized to play important roles in numerous cell biological processes, notably cell differentiation and tissue morphogenesis. Little definite is known, however, about how stress propagates through different cell structures or how it is converted to biochemical signals via mechanotransduction, due in large part to the difficulty of interpreting many cell mechanics experiments. A newly developed technique, two-point microrheology (TPM), can provide highly interpretable, quantitative measurements of cells frequency-dependent shear moduli and spectra of their fluctuating intracellular stresses. TPM is a non-invasive method based on measuring the Brownian motion of large numbers of intracellular particles using multiple particle tracking. While requiring only hardware available in many cell biology laboratories-a phase microscope and digital video camera, as a statistical technique, it also requires the automated analysis of many thousands of micrographs.
We have applied rheological methods for the analysis of ethanol-lysozyme interaction during the process of denaturation and aggregation of the protein. At low concentration of ethanol a destruction of the hydration shell of lysozyme is observed. With the increase in the ethanol concentration a structural transformation takes place. It leads to the formation of a protein aggregate with an elongated structure. The rheological characteristics of lysozyme-water-ethanol solution changes from Newtonian to pseudoplastic ...
Recognizing the significance of factual velocity fields in a rapid mixer, this study focuses on analyzing local velocity gradients in various mixer geometries with particle image velocimetry (PIV) and comparing the results of the analysis with the conventional G-value, for reviewing the roles of G-value in the current design and operation practices. The results of this study clearly show that many arguments and doubts are possible about the scientific correctness of G-value, and its current use. This is because the G-value attempts to represent the turbulent and complicated factual velocity field in a jar. Also, the results suggest that it is still a good index for representing some aspects of mixing condition, at least, mixing intensity. However, it cannot represent the distribution of velocity gradients in a jar, which is an important factor for mixing. This study as a result suggests developing another index for representing the distribution to be used with the G-value. ...
Heat transfer enhancement in the low Reynolds number condition is increasingly required with the perpetual attempt to integrate and miniaturize electronic
Cancer is a complex disease in which growth and progression is governed by biological as well as physical cues from surrounding cells and tissues. In this thesis three dimensional cell culture models of pancreatic cancer are used in an effort to decipher the intertwined roles of physical properties (rigidity and adhesion) and biological functions of the extracellular matrix (ECM) in regulating growth and treatment response. We have used mixtures of commercial basement membrane and collagen matrices to study the effect of ECM rigidity on tumor growth and morphology. Plating PANC-1 cells on theses matrices revealed a strong correlation between stiffness (increased collagen content) and tumor growth behavior. However, since matrix adhesion may also change as a result of varying concentration, we also studied the extreme case where there is no adhesion by growing non-adherent spheroids on agar beds with and without ECM proteins diluted in media. The latter component restores the presence of the same ECM
Capillary Dies in Capillary Rheometer Azadeh Farahanchi, Rheological Scientist, Ph.D 05.21.2018 Capillary rheometer is one the most common melt rheometer techniques to understand flow behavior and rheological properties of polymer materials under typical processing condition. In this test method, the molten polymer sample is forced to flow through an interchangeable capillary die by means of [...] ...
The deformation and behaviour of red blood cells (RBC) were studied in vivo in man with the aid of a skin-tube chamber technique enabling light microscopic observation of the microcirculation at high...
Flow visualizations and stereoscopic PIV (SPIV) measurements are carried out to study the flow phenomena developing in the rotor passage of an axial compressor at the onset of stall. Experiments have been performed in the JHU optically index-matched facility, using acrylic blades and liquid that have the same optical refractive index. The blade geometries are based on the first one and a half stages of the Low Speed Axial Compressor (LSAC) facility at NASA Glenn. The SPIV measurements provide detailed snapshots and ensemble statistics on the flow in a series of meridional planes. Data recorded in closely spaced planes enable us to obtain ensemble averaged 3D vorticity distributions. High speed imaging of cavitation, performed at low pressure, is used to qualitatively visualize the vortical structures within the rotor passage. The observations are performed just above and at stall conditions. At pre-stall condition, shortly after it rolled up, the tip leakage vortex (TLV) breaks up into widely ...
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Nonlinear shear and uniaxial extensional measurements on a series of graft-polystyrenes with varying average numbers and molar masses of grafted side chains are presented. Step-strain measurements are
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The method provides a means for a dentist to record the shape in situ of teeth prepared for repair. During a search mode, a high resolution grey scale image is presented on a monitor. The scan head is positioned over the prepared cavity, using this visual feedback. A trigger initiates actual 3D data acquisition, which is accomplished in a fraction of a second using an active triangulation principle. The result is stored in congruent memory banks in the form of a 3D profile and a pseudoplastic grey scale image representing the back-scattered contrast. The pseudoplastic contrast image is displayed instantaneously on the monitor. The point to point relationship between the pseudoplastic grey scale image and the 3D profile allows use of the grey scale display as a drawing plane for operator data verification and editing. The contour lines defining the desired restorative implant appear as an overlay to the grey scale image, while the actual positional
RapiThix™ polymers are rheology modifiers especially designed for use in cold-mix processes. These products are easy to use, shear-tolerant, shear-thinning and effective at low use levels. The performance characteristics and benefits of the polymers allow formulators to develop a range of efficacious and appealing personal care products.. ...
The three most common cement s for rock injection in Norway were characterized in terms of grout flow properties, stability and initial set for w/c = 1.2, 1.0, 0.8 and 0.6 at 8 and 20°C. The fineness was characterized by Blaine, BET and particle size distribution (PSD). The test methods w ere bleeding, consistency (ring and Marsh Cone), setting by Vic at and temperature evolution in insulated cup. Additional rheology tests with parallel plate rheometer and isothermal calorimetry for hydration evolution were performed for mixes at 20°C only. Only one of the three cements tested could be utilized at all w /c levels ...
Keflex and vomiting the rheological behavior of keflxe vehicle can have a significant effect on the release of the drug and the ability of keflex antibiotic pregnant drug to come into contact with the rectal mucosa. The blood cells are the red blood cells (RBCs or erythro- cytes), white blood cells (WBCs or leukocytes), and platelets (thrombocytes).
This website contains information about erythrocyte (red blood cells) in general, rheological behavior and the laboratory tests available on the market.
Determining fracturing rheological behavior of fracturing fluids | Method and tool for perforating a wellbore casing in a formation using a sand jet, and using such tool to... | Roller shade with a light regulating function | Apparatuses and systems for selectively locking lift cords used to lift architectural opening coverings | Window covering |
In this thesis, simulations are performed to study the motion ofindividual cells in flow, focusing on the hydrodynamics of actively swimming cells likethe self-propelling microorganisms, and of passively advected objects like the red bloodcells. In particular, we develop numerical tools to address the locomotion ofmicroswimmers in viscoelastic fluids and complex geometries, as well as the motion ofdeformable capsules in micro-fluidic flows.. For the active movement, the squirmer is used as our model microswimmer. The finiteelement method is employed to study the influence of the viscoelasticity of fluid on theperformance of locomotion. A boundary element method is implemented to study swimmingcells inside a tube. For the passive counterpart, the deformable capsule is chosen as the modelcell. An accelerated boundary integral method code is developed to solve thefluid-structure interaction, and a global spectral method is incorporated to handle theevolving cell surface and its corresponding ...
Soft matter materials can classically be characterized by their mechanical response to shear flow, so by rheology. Knowledge of the material structure in flow is, however, crucial to understand, predict and tune flow behaviour and therefore the rheological response. In this talk I will show how time-resolved scattering and microscopy techniques can be employed to probe the structure of materials in situ, during the rheological experiment, and thus to establish a link between the micro structure and the macroscopic response ...
The ARES-G2 offers the convenience of Smart SwapTM temperature control options, which are automatically detected and configured when attached.. View Rheometers View ARES-G2 Instrument Rheology Accessories View brochure Contact Us. ...
Dear friends, I am trying to solve 3D N-S equations (Low Reynolds number, Non-Newtonian fluid). I want to know some details about Finite Volume Method
The Rheograph series are new designed user-friendly High Pressure Capillary Rheometer with over again enlarged shear rate range, higher test piston force and a huge variety of options. The new developed Windows database Software allows the parameterisation, the online monitoring as well as the free definable evaluation. ...
Aaron Equipment buys, sells, and trades USED- Gottfert Capillary Rheometer, Model 012.01,. Submit a quote for this Lab Equipment or call 630-350-2200 for more information.
Rheology of jammed materials: theory of the divergence of viscosities for non-Brownian suspensions and shear jammed state for frictional grains under oscillatory shear ...
Croda is a leading global developer of speciality chemicals that aim to deliver value adding effects to improve process efficiency and product performance. Our products offer a range of technologies into the advanced materials market including improved dispersion stability, wetting and rheology.. ...
Proc X111 Int Cong Rheology, Cambridge, Ed DM Binding, NE Hudson, J Mewis, JM Piau, CJS Petrie, P Townsend and M Wagner, Vol 4, 368-370 (2000 ...
US Patent No. 9,526,925 B2; Edgewell Personal Care has patented a sunscreen composition that provides a cooling sensation when rubbed on a users skin. It is comprised of a rheology modifying agent selected from the group consisting of a
qodista batroolka CMC & PAC CMC iyo PAC la isticmaalo duurka qodista batroolka. Inta badan sida viscosifier ah, wakiilka gacanta rheology iyo khasaaro dheecaanka
Researchers at the University of Twentes research institute MESA+ are constructing molecular machines capable of exerting a measurable force at nanoscale and in fluid environment. The design of these machines is based ...
The main objective of the present study is to predict characteristics of three dimensional pulstitile flow by location of stenosis in blood vessel with the second order bifurcation. The present study simulates the incompressible non-Newtonian laminar blood flows using a Fluent V. 6.0. The Carreau mo...
Drugs included in this group are dedicated to preserving the rheological properties of blood - its fluidity (see antiplatelet agents), to replenish the volume of circulating through the vessels of the liquid (see TOOLS FOR ENTERAL AND PARENTERAL NUTRITION), for the formation of a blood clot and maintain the integrity (closedness) the vasculature in the cases, if any, will be broken for any reason such as trauma (see COAGULANTS (COAGULATION FACTORS), GEMOSTATIKI); a separate subgroup (see STIMULATORS of HEMATOPOIESIS) combines the substance that triggers the formation of blood cells participating in the implementation of its multiple functions ...
OBJECTIVES: During a longer car drive there are changes in rheological properties of drivers or passengers connective tissues taking place as a consequence of monotonous and vibration load. These changes show more among the pregnant drivers, whose motion system is under heavier demands due to pregnancy. To asses these changes we have ...... ...
The Malvern Zetasizer Nano range for characterization of particle size, zeta potential, molecular weight, protein mobility and rheological properties.
Combined measurements of the Lagrangian evolution of particle constellations and the coarse-grained velocity derivative tensor. partial derivative(u) over tilde (i) /partial derivative x(j) are presented. The data are obtained from three-dimensional particle tracking measurements in a quasi isotropic turbulent flow at an intermediate Reynolds number. Particle constellations are followed for as long as one integral time and for several Batchelor times. We suggest a method to obtain. partial derivative(u) over tilde (i) /partial derivative x(j) from velocity measurements at discrete points. Based on an analytical result and on a sensitivity analysis, both presented here, we estimate the accuracy for filtered strain, (s) over tilde (2), and enstrophy, (omega) over tilde (2), at around 30%. The accuracy improves with higher tracer seeding density and with smaller filter scale Delta. We obtain good scaling with t* = root 2r(2)/15S(2)(r) for filtered strain and vorticity and present filtered R-Q ...
Please Note, The ebooks are not always PDF format, you might receive epub/kindle formats after purchase. This is Digital Version of (Ebook) 978-9
We will illustrate the procedure for solving the three types of pipe flow problems for high-speed gas flows unknown driving force, unknown flow rate, and
Formation-breakdown cycle of turbulent jets in a rotating fluid - Volume 868 - I. U. Atthanayake, P. Denissenko, Y. M. Chung, P. J. Thomas
Read "Ultrasound Imaging Velocimetry: a review, Experiments in Fluids" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Read "Influence of a counter rotating vortex pair on the stability of a jet in a cross flow: an experimental study by flow visualizations, Experiments in Fluids" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
TY - JOUR. T1 - Thermal, crystallization, and dynamic rheological behavior of wood particle/HDPE composites. T2 - Effect of removal of wood cell wall composition. AU - Ou, Rongxian. AU - Xie, Yanjun. AU - Wang, Qingwen. AU - Sui, Shujuan. AU - Wolcott, Michael P. PY - 2014/6/5. Y1 - 2014/6/5. N2 - This study investigated the effect of removal of wood cell wall composition on thermal, crystallization, and dynamic rheological behavior of the resulting high density polyethylene (HDPE) composites. Four types of wood particle (WP) with different compositions: native wood flour (WF), hemicellulose-removed wood particle (HR), lignin-removed wood particle (holocellulose, HC), and both hemicellulose and lignin removed particle (α-cellulose, αC) were prepared and compounded with HDPE using extruder, both with and without maleated polyethylene (MAPE). Results show that removal of the hemicellulose improved the thermal stability of composites, while removal of the lignin facilitated thermal decomposition. ...
TY - BOOK. T1 - Rheology of Supramolecular Polymers. AU - Shabbir, Aamir. PY - 2016. Y1 - 2016. N2 - Supramolecular polymers are a broad class of materials that include all polymerscapable of associating via secondary interactions. These materials represent an emerging class of systems with superior versatility compared to classical polymers with applications in food stuff, coatings, cost efficient processes or biomedical areas. Design and development of supramolecular polymers using ionic, hydrogen bonding or transition metal complexes with tailored properties requires deep understanding of dynamics both in linear and non-linear deformations. While linear rheology is important to understand the dynamics under equilibrium conditions, extensional rheology is relevant during the processing or in the usage of polymers utilizing supramolecular associations for example, acrylic based pressure sensitive adhesives are subjected to extensional deformations during the peeling where strain hardening is ...
One of the room temperature ionic liquids (RTILs), 1-butyl-3-methylimidazoliumchloride ([BMIM]Cl) was chosen to prepare the concentrated solutions of Polyacrylonitrile(PAN). The rheological behaviors of the solutions were measured with rotational rheometryunder different conditions, including temperatures, concentration, and molecular weight ofPAN. The solutions exhibited shear-thinning behaviors, similar to that of PAN/DMFsolutions. The viscosities decreased with the increasing of shear rates. However, theviscosity decreased sharply at high shear rates when the concentration was up to 16wt%. Thedependence of the viscosity on temperature was analyzed through the determination of theapparent activation energy. Unusually, the viscosity of solutions of higher concentration islower than that of lower concentration. Similarly, the viscosity of low molecular weightPAN was higher than high molecular weight PAN at high shear rates. The dynamicrheological measurement indicates the loss modulus is much higher
Changes in rheological properties and amylase activities occurring in trifoliate yam, Dioscorea dumetorum, starch after harvest were investigated. Trifoliate yam tubers were harvested and stored under tropical ambient (28°C) and cold room conditions (4°C) for 12, 24 and 36 h. The D. dumetorum starches were extracted from the tubers under study and samples were evaluated for changes in their rheological properties (paste characteristics) during storage and to study the action of amylases on D. dumetorum starch after harvesting. The post-harvest activities of α and β-amylases were also studied to evaluate their rate of action on D. dumetorum starch. Storage caused decreases in the rheological properties (paste characteristics) of the tubers within 36 h of harvest. Similarly, α and β-amylase activities in the tubers more than doubled within 24 h after harvesting. Blanching, however, effectively decreased the action of amylases on D. dumetorum starch during storage, with subsequential increase ...
Two-dimensional in-cylinder velocity distributions measured with Particle Image Velocimetry were compared with computed results from Computational Fluid Dynamics codes. A high-swirl, two-valve, four-stroke transparent-combustion-chamber research engine was used. Comparisons were made of mean-flow velocity distributions, swirl-ratio evolution during the intake and compression strokes, and turbulence distributions at top-dead-center compression. This comparison with the measured flows led to more accurate calculations by identifying code improvements including swirl in the residual gas, modeling of the gas exchange during the valve overlap, and improved numerical accuracy ...
Dissertation abstracts: Rheological behaviour of system viscoelastic surface-active substance/assotsiirujushchy polymer and its components - Chemical sciences
Rheology (/riːˈɒlədʒi/; from Greek ῥέω rhéō, "flow" and -λoγία, -logia, "study of") is the study of the flow of matter, primarily in a liquid state, but also as "soft solids" or solids under conditions in which they respond with plastic flow rather than deforming elastically in response to an applied force. Rheology is the science of deformation and flow within a material. It is a branch of physics which deals with the deformation and flow of materials, both solids and liquids.[1] The term rheology was coined by Eugene C. Bingham, a professor at Lafayette College, in 1920, from a suggestion by a colleague, Markus Reiner.[2][3] The term was inspired by the aphorism of Simplicius (often attributed to Heraclitus), panta rhei, "everything flows",[4][5] and was first used to describe the flow of liquids and the deformation of solids. It applies to substances that have a complex microstructure, such as muds, sludges, suspensions, polymers and other glass formers (e.g., silicates), as ...