Analysis of evaporation in the presence of composition-induced natural convection

E. M. Sparrow, G. A. Nunez, A. T. Prata

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Evaporation from an open-topped vertical tube which is partially filled with a liquid has been investigated analytically and numerically. The space above the liquid surface is occupied by a binary mixture consisting of the evaporating vapor and a gas. Spatial variations of the concentrations of the vapor and the gas give rise to density variations which induce natural convection motions. The numerical solutions were carried out for water as the evaporating vapor and air as the gas. It was found that the presence of natural convection can lead to significant increases in the rate of evaporation-up to a factor of five for the investigated parameter ranges. The enhancement is favored by a relatively high concentration of vapor at the liquid surface, a dry ambient, and a relatively large tube diameter. The flow pattern consists of a U-shaped loop, with fluid drawn downward into the tube from the ambient through an annular region adjacent to the tube wall. The upstreaming flow in the core of the tube forms the other leg of the loop.

Original languageEnglish (US)
Pages (from-to)1451-1460
Number of pages10
JournalInternational Journal of Heat and Mass Transfer
Volume28
Issue number8
DOIs
StatePublished - Aug 1985

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Natural convection
free convection
Evaporation
Vapors
evaporation
tubes
Gases
vapors
Chemical analysis
liquid surfaces
Liquids
gases
Binary mixtures
Flow patterns
binary mixtures
flow distribution
Fluids
Water
Air
augmentation

Cite this

Analysis of evaporation in the presence of composition-induced natural convection. / Sparrow, E. M.; Nunez, G. A.; Prata, A. T.

In: International Journal of Heat and Mass Transfer, Vol. 28, No. 8, 08.1985, p. 1451-1460.

Research output: Contribution to journalArticle

Sparrow, E. M. ; Nunez, G. A. ; Prata, A. T. / Analysis of evaporation in the presence of composition-induced natural convection. In: International Journal of Heat and Mass Transfer. 1985 ; Vol. 28, No. 8. pp. 1451-1460.
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