COMPARISON OF TRIPLE-MOMENT TEMPERATURE-VELOCITY CORRELATIONS IN THE ASYMMETRIC HEATED JET WITH ALTERNATIVE CLOSURE MODELS.

Abstract

Measurements are reported of triple moments of velocity and temperature in a heated asymmetric two-dimensional turbulent jet involving velocity fluctuations in the x//1 - x//2 plane. The data thus obtained have been compared with those given by alternative algebraic models of the triple moments using, in the model formulae, experimental values of the second-moment quantities and the dissipation rate of kinetic energy. The study supports the view that in strongly asymmetric flows the contribuiton of mean temperature gradients to the triple moments can be appreciable. The comparison also provides some support for the use of the generalized gradient transport hypothesis in approximating dissipation of the triple moments. Refs.