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Large Structure Dynamics and Entrainment in the Mixing Layer at High Reynolds Number

Dimotakis, Paul E. and Brown, Garry L. (1975) Large Structure Dynamics and Entrainment in the Mixing Layer at High Reynolds Number. Purdue University , West Lafayette, IN.

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Observations were made on a turbulent mixing layer in a water channel at Reynolds numbers up to 3 x 10^6 . Flow visualization with dyes revealed (once more) large coherent structures and showed their role in the entrainment process; observations 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 an 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 is coupled to the large structure further downstream, and some possible consequences about the effects of initial conditions and,. of the influence of apparatus geometry are discussed.

Item Type:Report or Paper (Technical Report)
Additional Information:Project Squid Technical Report CIT-7-PU. Project SQUID is a cooperative program of basic research relation to Jet Propulsion. it is sponsored by the Office of Naval Research and is administered by Purdue University through Contract N00014-75-C-1143, NR-098-038. The work was supported by the Office of Naval Research (Fluid Dynamics Program Contract No. N00014-67-A-0094-0037 and Project SQUID Contract No. 4965-42) and the Caltech President's Fund Grant NO. PF-075.
Group:Graduate Aeronautical Laboratories (Fluid Mechanics), GALCIT
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-75-C-1143
Office of Naval Research (ONR)4965-42
Office of Naval Research (ONR)N00014-67-A-0094-0037
Caltech President's FundPF-075
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Project Squid Technical ReportCIT-7-PU
Record Number:CaltechAUTHORS:20141114-134017563
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51790
Deposited On:14 Nov 2014 21:49
Last Modified:22 Nov 2021 19:00

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