Non-dimensionalise equation

student

dear sir,

the momentum equation for natural convection porous medium is given by darcy equation by neglecting convectiona and diffusion terms u'=-K/Mu(dp'/dx') where k is porous permeability, Mu dynamic viscosity.

it is non-dimensionalised by u=u'L/alpha, x=x'/L , P'=row*alpha^2/L^2

the non-dimesionalised equaiton is given by simply u=-(dp/dx).(please elobrate this) what about K porous permeability.. could any body can dimenisonlize this