Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 202 for “"Shear Rate"”.
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The dependence of suspension viscosity on particle size, shear rate, and solvent viscosity
… μm, 51 μm ±4 μm, and 71 μm ±4 μm radii will be sheared at angular velocities of 1.000 rad/s ±0.001 rad/s, 2.000 rad/s ±0.001 rad/s , 3.000 rad/s ±0.001 rad/s, and 4.000 rad/s ±0.001 rad/s. The resulting relative viscosities will be used to study the functional dependence of the fitting …
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The acute effects of shear rate maniuplation on vascular function in a healthy population
… diseases. It is now well established that shear rate (SR), the quotient of blood flow velocity and vessel diameter, is responsible for both positive and negative adaptation of the vasculature. Previous data has identified that inflation of a cuff around the forearm induces an increase in …
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Fluid flow behavior of semi-solid aluminum at high shear rates
… data allowing calculations of viscosities at shear rates in excess of 1000 s-1. Alternatively, the DFV can be operated like a conventional parallel-plate compression viscometer, attaining shear rates as low as 10-5 s-1. Durations of an experiment range between approximately 5 ms and 24 hours. …
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Droplet coalescence in the shear flow of model emulsions
… phase can deform, breakup, coalesce or migrate to other regions within the flow field. Understanding these different processes, both individually and jointly, is relevant, for example, to the development of morphology in immiscible liquid-liquid systems such as polymer blends formulated …
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Developing a methodology for characterising in-situ viscosity profiles in tumbling mills
… of the milling process is affected by the rate of breakage of bigger rocks and the rate of transport of the slurry within and out of the mill. The transport of material in the mill is dependent on the rheological properties of the slurry such as viscosity. Viscosity is therefore one of the …
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A variational multiscale framework for non-Newtonian fluid models
… fluids. One class of non-Newtonian fluids is shear-rate dependent fluids that include nonlinear viscosity functions of the second invariant of the rate-of-deformation tensor, thereby resulting in shear-thinning or shear-thickening effects. Another is viscoelastic fluid models that embody …
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Nonlinear rheology of micelles and polymers
… and compared with experiment. In steady shear flow, the shear stress is shown to decrease with increasing shear rate, according to the constitutive equation. This behaviour, which is also shown by the Doi-Edwards equation, is unphysical. Both theories fail to take into account the fact …
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Laser Doppler velocimetry measurements of particle velocity fluctuations in a concentrated suspension
… Newtonian fluids suggest that the particles nijgrate in response to gradients in "suspension temperature," defined as the average kinetic energy contained in the particle velocity fluctuations. These models have not yet been compared systematically with experimental data. In addition, the …
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Detection Method of Subclinical Atherosclerosis of the Carotid Artery with a Hemodynamics Modeling Approach
… the carotid artery bifurcation to compare shear stress and shear rate. Computer-aided design and fluid flow software were used to model hemodynamics through the carotid artery. Data from the model was derived from governing equations programmed in COMSOL for both laminar and turbulent flow. …
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Mechanics of Aggregated Alumina Suspensions: Behavior Under Shear and Compression
A series of experiments performed in a novel shear cell clearly demonstrate that the presence of a combined load alters the mechanical response for an aggregated suspension. Imposing a shear field on the particle network reduces the compressive strength of the network. The magnitude of this …
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Simulations of subsurface multiphase flow including polymer flooding in oil reservoirs and infiltration in vadose zone
… polymer model within the Implicit Parallel Accurate Reservoir Simulator (IPARS), which enables parallel simulation of non-Newtonian fluid flow through porous media. The following properties of polymer solution are modeled in this work: 1) polymer adsorption; 2) polymer viscosity as a function of …
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A model for predicting narrow tool behavior under dynamic conditions
… tests was conducted to determine the effect of shear rate on soil shear strength and soil-metal friction parameters. Second, a model was developed to include dynamic effects. Third, the model was verified experimentally under laboratory conditions. Direct shear tests using a conventional shear …
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Rheology of chocolate. Rheological studies of chocolate in relation to their flow and mixing properties during manufacture.
… constituents of chocolate. c) to determine the shear rate which, for a given recipe, yields a minimum stable viscosity (of particular commercial value). d) to assess the type of mixer able to provide this duty. The experimental work involved rheological studies with concentric cylinder and …
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Impact of inactivity and exercise on the vasculature in humans : the role of blood flow and shear stress on arterial adaptations in healthy males
… different exercise intensities, with and without shear rate modification. Shear rate modification was also used to examine the impact of systemic exercise training on brachial haemodynamics. Finally, the effect of inactivity on vascular function and arterial remodelling were studied using novel …
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Fractal structure of aggregates induced by shear motion.
Aggregates formed by Brownian motion, shear motion, and differential sedimentation are found to be fractals. To characterize the structure and properties of these aggregates, a set of equations was derived to describe the relationship between aggregate size and solid volume, porosity, density, …
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Friction and lubrication behaviour of metal-on-metal and ZTA ceramic-on-CFR PEEK hip prostheses. Friction and lubrication behaviour of metal-on-metal hip resurfacing and ZTA ceramic heads versus CFR PEEK cups wiith various diameters and clearances using serum-based lubricants with various viscosities.
… used to investigate the frictional torque generated between the articulating surfaces so as the friction factor can be calculated. Stribeck analysis was then employed to assess the mode of lubrication. For the metal-on-metal hip resurfacing joints, the friction factors were in the range …
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Nonlinear dynamics of a nematic liquid crystal in the presence of a shear flow
… behaviour of the system: the temperature and the shear rate, and by employing continuation and bifurcation theory we describe the different time dependent states for the two and three dimensional cases.<br/><br/>For the two dimensional case we compute the steady state solution branches finding …
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Single wall carbon nanotubes as viscosity modifiers in polypropylene matrix nanocomposites
… carbon nanotubes (SWNTs) were studied as low shear rate viscosity modifiers in the polypropylene matrix of nanocomposites. To create nanocomposites which did not demonstrate increased low shear rate viscosity when nanotubes were added into the polymer melt, this work focused on modifying the …
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An empirical constitutive equation for anti-coagulated human blood
… non-Newtonian index. A model including only the shear rate as the independent variable was found to be lacking any substantial degree of significance. When hematocrit was added as an independent variable, the degree of fit increased considerably. Of the chemical variables examined, the least …
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