Linear stability of condensate film flow down a vertical plane with nonuniform surface tension

Gung Huei Chou, Jyh Chen Chen

Research output: Contribution to journalArticlepeer-review

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Abstract

This paper presents the linear stability analysis of condensate film flow down a vertical plane. The influences of the surface tension variation caused by the interfacial temperature fluctuation were taken into account. The results indicate that the surface tension variation stabilizes condensate films and has a significant effect on the film stability. The calculated critical Reynolds number is approximately ten times larger than the value of the uniform surface tension. Moreover, it is found that the larger the temperature gradient, the more stable the film. The critical distance increases with increasing surface tension but it varies inversely with temperature gradient. The analysis presented also leads to closed-form expressions for the dimensionless wave amplification rate, the dimensionless wave velocity, the neutral stability curve, and the critical Reynolds number.

Original languageEnglish
Pages (from-to)197-203
Number of pages7
JournalJournal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao
Volume17
Issue number2
StatePublished - Apr 1996

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