Abstract
Numerical predictions are compared with the results of experimentation on turbulent mixing in swirling pipe flows with density nonhomogeneity induced by the mixing of He or CO2 with air. Computations employ two kinds of stress/flux equation models : The density-weighted Favre-averaged form and the density-unweighted conventional time-averaged form. The calculation based on the former model can predict that the mixing of He with air will be more strongly suppressed than the mixing of Co2, whereas the latter model fails to predict this. The possible interpretations of the interrelation between turbulent mixing, density nonhomogeneity and swirl-induced pressure gradient are presented.
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