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The effect of a density difference on shear-layer instability

Davey, Robert F. and Roshko, Anatol (1972) The effect of a density difference on shear-layer instability. Journal of Fluid Mechanics, 53 (3). pp. 523-543. ISSN 0022-1120. doi:10.1017/S0022112072000291.

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Measurements of mass flow rate and mean density have been made in separated laminar boundary layers with large transverse density gradients. Two-dimensional shear layers were formed by exhausting a half-jet of one gas into a reservoir of another gas with a different molecular weight. Two freons with a density ratio of 1-98 and unusual properties which permitted the measurement of the mass flow rate with a single hot wire were used. A n analysis of the mass flow rate fluctuations showed that a negative density gradient (i.e. light gas flowing into heavy) increases the amplification rate of the instability oscillations and reduces the frequency and wave number. Opposite trends were observed when the density gradient was positive. These findings are in agreement with recent theoretical predictions.

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Additional Information:Copyright © 1972 Cambridge University Press. Reprinted with permission. Received 11 August 1971 and in revised form 30 December 1971. The authors are grateful to D.E. Coles for his advice on various aspects of the experiment and to the Office of Naval Research for support under Contract N14 67A94 001.
Issue or Number:3
Record Number:CaltechAUTHORS:DAVjfm72
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10028
Deposited By: Archive Administrator
Deposited On:07 Apr 2008
Last Modified:08 Nov 2021 21:04

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