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LaTeX Math Block
anchor1
alignmentleft
\left<\frac{k_{r \alpha}}{\mu_\alpha} \right>

where 

LaTeX Math Inline
body\displaystyle k_{r\alpha}

relative formation permeabilityto fluid 

LaTeX Math Inline
body\alpha
-phase

LaTeX Math Inline
body\displaystyle \mu_\alpha

dynamic viscosity of fluid

LaTeX Math Inline
body\alpha
-phase


In most practical case of a 3-phase fluid model this will be:

LaTeX Math Inline
body\displaystyle \

left<\

frac{k_o}{\mu_o}

\right>


Oil mobility

LaTeX Math Inline
body\displaystyle \

left<\

frac{k_g}{\mu_g}

\right>


Gas mobility

LaTeX Math Inline
body\displaystyle

\left<

\frac{k_w}{\mu_w}

\right>


Water mobility