where xi and yi are the mole fractions of species i in the liquid and vapor phases respectively. The N are the molar fluxes of species i, and the Dik represent the corresponding Maxwell-Stefan diffusivity of the i-k pair in the appropriate phase. Only c - 1 of the Eqs. (9.14) and (9.15) are independent; the mole fraction of the last component is obtained by the summation equations for both phases.
The energy flux is related to conductive and convective contributions as follows
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