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Wall shear stress

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The wall shear stress, \tau_w, is given by:

\tau_w = \mu \left(\frac{\partial u}{\partial y} \right)_{y=0}

Where \mu is the dynamic viscosity, u is the flow velocity parallel to the wall and y is the distance to the wall.

The SI unit of wall shear stress is pascal (Pa), which is identical to \frac{kg}{m\cdot s^2}.

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