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Particle streak velocity field measurements in a two-dimensional mixing layer

Dimotakis, Paul E. and Debussy, Francois D. and Koochesfahani, Manoochehr M. (1981) Particle streak velocity field measurements in a two-dimensional mixing layer. Physics of Fluids, 24 (6). pp. 995-999. ISSN 1070-6631.

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Using digital image processing of particle streak photography, the streamwise and perpendicular components of the velocity field were investigated, in the mid‐span plane of a two‐dimensional mixing layer, with a 6:1 velocity ratio. The Reynolds number of the flow, based on the local vorticity thickness and the velocity difference across the layer, ranged from 1360 to 2520, in the plane of observation. The significant result of this experiment was that the region of vorticity bearing fluid is confined to a small fraction of the flow. A second finding, consistent with the small regions of concentrated vorticity, was the observation of instantaneous streamwise velocity reversal, in the laboratory frame, in small regions of the flow.

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Additional Information:© 1981 American Institute of Physics. Received 9 December 1980; accepted 11 March, 1981. This research was sponsored by the Air Force Office of Scientific Research, contract no. F49620-79-C-0159, the National Science Foundation grant no. ENG-7810 246 and the California Institute of Technology.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)F49620-79-C-0159
NSFENG-7810 246
Subject Keywords:Reynolds number, Velocity, Layers, Streak photography, Vortices, Water
Classification Code:PACS: 47.27.nb; 47.32.Ef
Record Number:CaltechAUTHORS:20120718-100125180
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32543
Deposited By: Tony Diaz
Deposited On:18 Jul 2012 18:15
Last Modified:21 Sep 2016 23:05

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