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The Effects of Damkohler Number on a Turbulent Shear Layer - Experimental Results

Mungal, M. G. and Frieler, C. E. (1985) The Effects of Damkohler Number on a Turbulent Shear Layer - Experimental Results. California Institute of Technology , Pasadena, CA. (Unpublished)

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A chemical reaction for which the reaction rate can be varied is studied in a fully developed, two-dimensional, turbulent mixing layer. The layer is formed between two nitrogen streams, one carrying low concentrations of fluorine and the other hydrogen and nitric oxide. For fixed concentrations of fluorine and hydrogen and for nitric oxide concentrations that are small fractions of the fluorine concentration, the heat release is fixed but the overall reaction rate is controlled by the nitric oxide concentration. Therefore, for fixed flow conditions, the nitric oxide concentration determines the ratio of the reaction rate to the mixing rate. For large values of this ratio, the amount of product, at a given downstream location, measured by the mean temperature rise, is independent of the reaction rate, i.e., the reaction is mixing limited. As the reaction rate is reduced the major effects are: (1) amount of product declines (as expected), (2) the mean temperature profile, which is initially some what unsymmetrical because the hydrogen-fluorine freestream concentration ratio is set at a large value, becomes symmetrical, and (3) the ramp-like instantaneous temperature traces within the large structure gradually become more top-hat.

Item Type:Report or Paper (Technical Report)
Additional Information:© 1985 California Institute of Technology. GALCIT Report FM85-01. The authors wish to thank Dr. J. E. Broadwell (who is an unofficial co-author) for numerous technical discussions, Dr. P. E. Dimotakis. Dr. W. L. Shackleford, Dr. R. C. Miake-Lye and Mr. Earl Dahl for help in conducting the experiments. This work is sponsored by the Air Force Office of Scientific Research under Grant No. 83-0213.
Group:Graduate Aeronautical Laboratories (Fluid Mechanics), GALCIT
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)83-0213
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Other Numbering System NameOther Numbering System ID
GALCIT Report FM85-01
Record Number:CaltechAUTHORS:20141020-162621146
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50587
Deposited On:21 Oct 2014 15:34
Last Modified:17 Nov 2021 17:34

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