Journal of Fluid Mechanics

A simple model of mixing and chemical reaction in a turbulent shear layer

J. E.  Broadwell a1 and R. E.  Breidenthal a1p1
a1 Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125

Article author query
broadwell je   [Google Scholar] 
breidenthal re   [Google Scholar] 


Arguments are presented to show that the concept of gradient diffusion is inapplicable to mixing in turbulent shear layers. A new model is proposed for treating molecular mixing and chemical reaction in such flows at high Reynolds number. It is based upon the experimental observations that revealed the presence of coherent structures and that showed that fluid elements from the two streams are distributed unmixed throughout the layer by large-scale inviscid motions. The model incorporates features of the strained flame model and makes use of the Kolmogorov cascade in scales. Several model predictions differ markedly from those of diffusion models and suggest experiments for testing the two approaches.

(Published Online April 20 2006)
(Received July 2 1981)
(Revised May 24 1982)

p1 Present address: Dept of Aeronautics, University of Washington, Seattle, WA 98195.