"Mixed" pattern condensation of multicomponent mixtures

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"Mixed" pattern condensation, in which drops, streaks and a few patches of a continuous film simultaneously form the condensate, was investigated by condensing binary mixtures of methanol-water and methanol-ethanol and ternary mixtures of acetone-methanol-water onto a gold-plated copper surface. Photographs of the condensate showed the following patterns relative to the temperature difference T - Tw : filmwise, filmwise-streakwise, streak-wise, streakwise-dropwise and dropwise. The observations demonstrate the following general trends: (a) The condensation pattern of mixtures which form a stable film with respect to the Marangoni effect (acetone-methanol) is always filmwise. (b) The condensation pattern of mixtures forming an unstable film (methanol-water, acetone-methanol-water) changes from filmwise to dropwise. depending on T - Tw and the composition of the mixture. At large temperature differences or as the composition approaches that of a pure component, filmwise condensation is predominant. At small T - Tw, streakwise-dropwise and dropwise condensation occurs. (c) In all cases the gas side resistance increases with decreasing T - Tw. (d) Mixed pattern condensation enhances the condensation flux as compared to filmwise condensation by as much as a factor of 4.

Original languageEnglish
Pages (from-to)141-156
Number of pages16
JournalThe Chemical Engineering Journal
Issue number2
StatePublished - 1 Jan 1979

ASJC Scopus subject areas

  • General Engineering


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