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The mixing layer at high Reynolds number: large-structure dynamics and entrainment

Dimotakis, Paul E. and Brown, Garry L. (1976) The mixing layer at high Reynolds number: large-structure dynamics and entrainment. Journal of Fluid Mechanics, 78 (3). pp. 535-560. ISSN 0022-1120. doi:10.1017/S0022112076002590.

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A turbulent mixing layer in a water channel was observed at Reynolds numbers up to 3 × 10^6. Flow visualization with dyes revealed (once more) large coherent structures and showed their role in the entrainment process; observation of the reaction of a base and an acid indicator injected on the two sides of the layer, respectively, gave some indication of where molecular mixing occurs. Autocorrelations of streamwise velocity fluctuations, using a laser-Doppler velocimeter (LDV) revealed a fundamental periodicity associated with the large structures. The surprisingly long correlation times suggest time scales much longer than had been supposed; it is argued that the mixing-layer dynamics at any point are coupled to the large structure further downstream, and some possible consequences regarding the effects of initial conditions and of the influence of apparatus geometry are discussed.

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Additional Information:© 1976 Cambridge University Press. Received 7 November 1975 and in revised form 19 March 1976. Published online: 11 April 2006.
Issue or Number:3
Record Number:CaltechAUTHORS:20120731-074114467
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32803
Deposited By: Tony Diaz
Deposited On:31 Jul 2012 21:09
Last Modified:09 Nov 2021 21:30

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