Dimensionless ratio of the C-component mass in  $//<![CDATA[ \begin{array}{l}\alpha\end{array} //]]>$-phase  $//<![CDATA[ \begin{array}{l}m_{C \alpha}(p, T)\end{array} //]]>$ to the total mass of  $//<![CDATA[ \begin{array}{l}\alpha\end{array} //]]>$-phase  $//<![CDATA[ \begin{array}{l}m_\alpha(p, T)\end{array} //]]>$:

It's a function of pressure  $//<![CDATA[ \begin{array}{l}p\end{array} //]]>$ and temperature  $//<![CDATA[ \begin{array}{l}T\end{array} //]]>$ and one of the key objectives of fluid modelling. 

The most important cross-phase exchange coefficients in practise are related to Solution GOR  $//<![CDATA[ \begin{array}{l}R_s\end{array} //]]>$ and Vaporized Oil Ratio  $//<![CDATA[ \begin{array}{l}R_v\end{array} //]]>$ in Volatile Oil fluid model:

See Also

Petroleum Industry / Upstream / Subsurface E&P Disciplines / Fluid (PVT) Analysis

Cross-phase fluid exchange