Free convection in an air-water vapor boundary layer

Ephraim M Sparrow, J. W. Yang, C. J. Scott

Research output: Contribution to journalArticlepeer-review


This paper describes an experimental investigation, supported by analysis, of free convection in an air-water vapor boundary layer at the stagnation point of a horizontal cylinder. A two-component boundary layer is created by the effusion of water vapor from the porous surface of the cylinder; the ambient gas is pure air. The results of both experiment and analysis indicate that the heat transfer decreases as the surface mass-transfer rate increases. At moderate blowing rates, there is good agreement between the experimentally- and analytically-determined Nusselt numbers. At higher mass-transfer rates, the data lie above the analytical predictions by about 25 per cent. This departure is attributed to a fluctuating motion in the boundary layer.

Original languageEnglish (US)
Pages (from-to)53-61
Number of pages9
JournalInternational Journal of Heat and Mass Transfer
Issue number1
StatePublished - Jan 1966

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