Darcy equation (model)

The momentum balance equation

(1)	$\begin{array}{l}\displaystyle {\bf u} = - \frac{k}{\mu} \nabla p\end{array}$

where

$\begin{array}{l}{\bf u}\end{array}$	flow velocity
$\begin{array}{l}\nabla p\end{array}$	pressure gradient
$\begin{array}{l}{k\end{array}$	formation permeability
$\begin{array}{l}\mu\end{array}$	fluid visocity

Only valid for the slow flow: $\begin{array}{l}{ \rm Re} < 1\end{array}$

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