shear rate


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shear rate

the change in velocity of parallel planes in a flowing fluid separated by unit distance; its units expressed in seconds-1.
References in periodicals archive ?
The online capillary rheometers have been developed based on the injection-molding machine to further extend the measuring range to much higher shear rate levels [7-12].
And not only does it change, it does so not in a linear or proportional manner, but in a logarithmic relationship to the shear rate.
Control software allows the quick and easy production of flow-curves, plots of viscosity as a function of shear rate, for sensitive and detailed rheological analysis.
we measured viscosity as a function of the rotational speed or the shear rate.
To get the behavior of blood in a shear flow, the key features is shear rate which is defined as a measure of the deformation of the liquid.
Non-Newtonian fluids can exhibit two different types of behaviour but, most commonly, they shear-thin; the greater the applied shear rate the lower the viscosity.
In their work, the researchers took into account a number of variables, including the type of processing equipment used: high-shear blending systems compared with recirculating systems, water temperature (4 C compared with 22 C), and high and low shear rates.
For one headbox sample we determined the effect of shear rate on drainage resistance.
Also, unexpectedly, these fluids showed a similar response to rubbing -- shearing -- by a surface moving at increasing speeds: Friction increased exponently as the shear rate increased, and that exponential relationship held constant over a range of molecules and surfaces.
The primary reason is that the viscoelastic behavior is typically not only time dependent, but also temperature and shear rate dependent as well.
All the operator has to do is enter the shear stress or shear rate, temperature, and test time requirements, and the instrument completes the data collection and analysis.
The specimen is sheared at a high shear rate to simulate application, and then the shear rate is suddenly reduced to a very low level.