The Effect of Schmidt Number on Turbulent Scalar Mixing in a Jet-in-Crossflow

Guangbin He, Yanhu Guo, Andrew T. Hsu, A. Brankovic, S. Syed, N.-S. Liu
1999 Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations   unpublished
The adequacy and accuracy of the constant Schmidt number assumption in predicting turbulent scalar fields in jetin-crossfiows 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 coupled with the standard k-e turbulence model. A semi-analytical qualitative analysis was made to guide the selection of Schmidt number values. A series of parametric studies were performed, and
more » ... re performed, and Schmidt numbers ranging from 0.2 to 1.5 and jet-to-crossflow momentum flux ratios from 8 to 72 were tested. The principal observation is that the Schmidt number does not have an appreciable effect on the species penetration, but it does have a significant effect on species spreading rate in jet-in-crossflows, especially for the cases where the jet-to-crossflow momentum flux ratios are relatively small. A Schmidt number of 0.2 is recommended for best agreement with data. The limitations of the standard k -E turbulence model and the constant Schmidt number assumption are discussed. = Non-dimensional temperature 13 = Density
doi:10.1115/99-gt-137 fatcat:iokzmrxszje5tdgmmez3wo2pi4