 Momentum diffusion (source code)

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= Momentum diffusion
{title2=$\partial_t u=\nu\partial_z^2u$}

Viscous transfer of tangential <momentum> smooths gradients of <velocity>. For unidirectional incompressible flow without a <pressure gradient>, the <Navier-Stokes equation> reduces to the displayed <diffusion equation>, whose diffusion coefficient is the <kinematic viscosity> $\nu=\eta/\rho$.

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