Shear rate

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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 simple shear case it is just a gradient of velocity

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.


Areal velocity. This classical mechanics-related article is a stub. You can help Wikipedia by expanding it.
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