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

[+] Author Affiliations
Guangbin He, Yanhu Guo, Andrew T. Hsu

University of Miami, Coral Gables, FL

A. Brankovic, S. Syed

Pratt & Whitney, West Palm Beach, FL

N.-S. Liu

NASA Lewis Research Center, Cleveland, OH

Paper No. 99-GT-137, pp. V002T02A029; 10 pages
  • ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition
  • Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Indianapolis, Indiana, USA, June 7–10, 1999
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7859-0
  • Copyright © 1999 by ASME


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 coupled with the standard k-ε 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 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 kε turbulence model and the constant Schmidt number assumption are discussed.

Copyright © 1999 by ASME
Topics: Scalars , Turbulence
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