with mi and mt being the molecular weight of the component I and
the mixture, respectively, tGi
is the molar volume of gas, cI is the
activity coefficient for each component, Poi
is the vapor pressure and
Pp is the total pressure in the permeate side.
Reynolds number was calculated according to Schnabel et al.
(1998). It was considered an aqueous solution, and because of this,
viscosity and density used was the values described by the authors
with temperature of 298 K (25 C).