@wikipedia


The driving equation for steady-state single-phase fluid between infinite parallel planes:

u =\frac{k}{\mu} \nabla p

where

flow velocity

pressure gradient along the flow

fluid viscosity

pipe cross-sectional permeability

cross-sectional pipe area


See also


Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Dynamics / Fluid flow / Steady-State Fluid Flow 

Plane Poiseuille flow ]