The adequacy and accuracy of the constant Schmidt number assumption in predicting turbulent scalar fields in jet-in-crossflows are assessed in the present work. A round jet injected into a confined crossflow in a rectangular tunnel has been simulated using the Reynolds-averaged Navier–Stokes equations with the standard k–ε turbulence model. The principal observation is that the turbulent Schmidt number has a significant effect on the prediction of the species spreading rate in jet-in-crossflows, especially for the cases where the jet-to-crossflow momentum flux ratios are relatively small. A turbulent Schmidt number of 0.2 is recommended for best agreement with experimental data.
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He et al. (1999) studied this question.
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