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Shear rate

Shear rate is a measure of the rate of shear deformation:

\dot \gamma_{xy}=\frac {\partial v_x} {\partial y} + \frac{\partial v_y} {\partial x}

For the simple shear case, it is just a gradient of velocity in a flowing material. The SI unit of measurement for shear rate is sec-1, expressed as "reciprocal seconds" or "inverse seconds."[1]

For a Newtonian fluid wall Shear stress (τw) can be related to shear rate by \tau_{w} = {\dot \gamma_{x} \mu}, where μ is the Viscosity of the fluid.


  1. ^ Brookfield Engineering - Glossary section on Viscosity Terms. Retrieved on 2007-06-10.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Shear_rate". A list of authors is available in Wikipedia.
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