Mass Transfer Rate

\[N_A = k\Delta C_A = k(C_A-C_A^{*})\] where

\(N_A\) = mass transfer flux of component \(A\), mol/(area.time)
\(k\) = mass transfer coefficient
\(C_A\) = bulk concentration of \(A\)
\(C_A^{*}\) = equilibrium concentration of \(A\)



There are various forms of concentration measures, such as mol/ltr, partial pressure, mole fraction, mole ratio, etc.