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

J. E. Broadwell, R. E. Breidenthal
1982 Journal of Fluid Mechanics  
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 a t 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
more » ... l 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. t Present address:
doi:10.1017/s0022112082003401 fatcat:dpd4mwogoferlm2rn5uo3o5cte