A two-phase boundary layer and its drag-reduction characteristics

E. M. Sparrow, V. K. Jonsson, E. R.G. Eckert

Research output: Contribution to journalArticle

Abstract

Consideration is given to coexisting gas and liquid boundary layers which occur when a gas is injected at the surface of a flat plate into a free-stream liquid flow. It is postulated that the gas forms a continuous film over the plate surface. The problem can be formulated exactly within the framework of laminar boundary-layer theory. Solutions have been carried out for a range of values of blowing velocity and of a fluid property parameter (ρµ) L/ (ρµ)g -It is demonstrated that the drag forces associated with the two-phase boundary layer are much smaller than those for the single-phase liquid flow. For example, for a blowing velocity which is 0.001 of the free-stream velocity and a gas Reynolds number of 105, the over-all drag calculation yields a value which is 0.0205 of the single-phase drag force. The effect of evaporation at the gas-liquid interface is analyzed and found to be small at temperatures which are not too close to saturation. 1962 by ASME.

Original languageEnglish (US)
Pages (from-to)408-414
Number of pages7
JournalJournal of Applied Mechanics, Transactions ASME
Volume29
Issue number2
DOIs
StatePublished - Jan 1 1960

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drag reduction
Drag reduction
Phase boundaries
boundary layers
Boundary layers
drag
Drag
Gases
gases
blowing
liquid flow
free flow
Liquids
Blow molding
laminar boundary layer
Laminar boundary layer
flat plates
liquids
Reynolds number
Evaporation

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A two-phase boundary layer and its drag-reduction characteristics. / Sparrow, E. M.; Jonsson, V. K.; Eckert, E. R.G.

In: Journal of Applied Mechanics, Transactions ASME, Vol. 29, No. 2, 01.01.1960, p. 408-414.

Research output: Contribution to journalArticle

Sparrow, E. M. ; Jonsson, V. K. ; Eckert, E. R.G. / A two-phase boundary layer and its drag-reduction characteristics. In: Journal of Applied Mechanics, Transactions ASME. 1960 ; Vol. 29, No. 2. pp. 408-414.
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