Condensation of Vapor Mixtures

It is much the same for condensers the presence of air ensures that the temperature of the gas phase does not remain uniform throughout, for it must fall as the steam concentration (and therefore partial pressure also) diminishes. Often, however, designers will ignore such effects, or take account of them only approximately. Similar problems arise in condensers for multicomponent mixtures. 

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For definiteness, we consider the transfer processes between a cylindrical wall and a turbulently flowing n-component fluid mixture. For condensation of vapor mixtures flowing inside a vertical tube, for example, the wall can be considered to be the surface of the liquid condensate film. We examine the phenomena occurring at any axial position in the tube, assuming that fully developed flow conditions are attained. For steady-state conditions, the equations of continuity of mass of component i (assuming no chemical reactions), Eqs. 1.3.7 take the form... 

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