The mixing transition in free shear flows
- Creators
- Roshko, Anatol
- Other:
- Jiménez, Javier
Abstract
The term "mixing transition" denotes an increase in molecular mixedness observed in a shear How which has earlier experienced the conventional (momentum) transition from laminar flow. First defined by Konrad (1976), from measurements of concentration in a free shear layer, the transition has been described and measured by a number of other methods, in particular by flow visualization, by measurement of chemical reaction product and by hot-wire anemometry, in aqueous as well as gaseous flows. In this presentation we review some of the measurements and try to assess what insight they may give on several questions that occur. 1. What is the relation of the mixing transition to Reynolds number and to other events: the momentum transition; vortex pairing; development of streamwise vortex structure? 2. How much does interfacial area increase during the transition? 3. How fast docs this occur? 4. Docs chaotic advection play a role? The answers arc tentative and incomplete.
Additional Information
© 1991 Springer. Much of the experimental work used for reference here was supported by the U. S. Office of Naval Research and the Air Force Office of Scientific Research. Discussions with P. Bernal and R. Breidenthal provided helpful clarifications.Additional details
- Eprint ID
- 52234
- Resolver ID
- CaltechAUTHORS:20141201-133432952
- Office of Naval Research (ONR)
- Air Force Office of Scientific Research (AFOSR)
- Created
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2014-12-01Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- GALCIT
- Series Name
- NATO ASI series. Series B, Physics
- Series Volume or Issue Number
- 268