Simultaneous heat and mass transfer from multicomponent condensing vapor‐gas systems

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<jats:title>Abstract</jats:title><jats:p>Multicomponent vapor condensation in the presence of noncondensing gas has been analyzed using numerical solutions to a set of linearized rate equations that describe the simultaneous heat and mass transfer to the condensate film. For specific examples of methanol and water and ethanol and toluene condensing from turbulent air streams in vertical tube and on horizontal tube condensers, it is shown that the alcohol concentrations in both the liquid and gas phases increase as condensation from initially superheated, alcohol‐rich gas phases progresses; the liquid phases also become richer in alcohol. The mass fluxes of the vapors vary with their respective mass transfer coefficients and local concentration driving forces. In the vertical tube condensers, the flux of the alcohols go through maximums. Gas phase saturation is approached as the mixtures cool and the final traces of vapor become more difficult to condense. Interface properties are computed from limited <jats:italic>VL</jats:italic> equilibrium data, heat of solution data, and a predictive equation. The techniques of solution and analysis have general application to the design of cooler‐condensers in either vertical or horizontal configurations.</jats:p>

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