Topic
Rheometer
About: Rheometer is a research topic. Over the lifetime, 5759 publications have been published within this topic receiving 125849 citations.
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TL;DR: In this paper, the use of NMR to monitor the behavior of entangled polymers subjected to shear was proposed as a new experimental technique for studying the microscopic response of poly(vinyl methyl ether)-water mixtures.
Abstract: The use of NMR to monitor the behavior of entangled polymers subjected to shear, is proposed as a new experimental technique for studying the microscopic response to shear-induced anisotropy in bulk polymers. A cone and plate rheometer designed to operate in a standard NMR probe is described. Sheared melts of poly(isobutylene) and poly(dimethylsiloxane) are studied. A shear-induced phase transformation in poly(vinyl methyl ether)-water mixtures is also demonstrated
45 citations
01 Jan 2009
TL;DR: In this article, a new model based on dynamic powder flow properties to predict the torque measured in the mechanically stirred fluid-bed rheometer (msFBR) is proposed.
Abstract: A new model based on dynamic powder flow properties to predict the torque measured in the mechanically stirred fluid-bed rheometer (msFBR) is proposed. A Schulze shear cell was used to measure the powder flow properties. An inverse procedure to evaluate powder flow properties from torque data is proposed and verified with shear cell data.
45 citations
TL;DR: The LSR was demonstrated to be capable of measuring the elastic properties of the vocal fold in a repeatable and reliable manner and it could detect areas where the tissue was artificially stiffened.
Abstract: Objective: The linear skin rheometer (LSR), which measures skin visco-elasticity, was adapted for measurements of vocal fold properties. A series of studies was performed on animal
45 citations
TL;DR: In this paper, the influence of both viscous dissipation and fluid inertia on the property measurements in oscillatory sliding plate rheometry is investigated, and a unified criterion for avoiding measurement errors is provided.
Abstract: For liquids with high viscosity and low thermal conductivity, viscous dissipation can cause appreciable errors in rheological property measurements. Here, the influences of both viscous dissipation and fluid inertia on the property measurements in oscillatory sliding plate rheometry are investigated. For Newtonian fluids, Bird (1965) solved the combined problem analytically, but only for high frequencies. Here his solution is extended to any frequencies. Also, the equations of motion and energy are solved for linear viscoelastic fluids, and new analytical solutions for the velocity and temperature profiles are given. In both Newtonian and linear viscoelastic fluids, the temperature rise in the gap increases with frequency. The location of the maximum temperature shifts from the mid-plane at low frequency towards the moving wall at high frequency. The fluid inertia increases the viscous dissipation in both fluids. By solving the combined problem, this paper simplifies rheometer design by providing one unified criterion for avoiding measurement errors. Operating limits are presented graphically for minimizing the effects of both fluid inertia and viscous dissipation in oscillatory sliding plate rheometry.
45 citations
TL;DR: A magnetically levitated sphere rheometer (MLSRR) is proposed in this paper to measure viscosity of fluids exposed to high-pressure carbon dioxide, which can be used to measure zero shear viscosities of transparent high pressure materials.
45 citations