The recovering boundary layer downstream of a separation bubble is known to have a highly perturbed turbulence structure which creates difficulty for turbulence models. The present experiment addressed the effect of this perturbed structure on turbulent heat transport. The turbulent diffusion of heat downstream of a heated wire was measured in a perturbed channel flow and compared to that in a simple, fully developed channel flow. The turbulent diffusivity of heat was found to be more than 20 times larger in the perturbed flow. The turbulent Prandtl number increased to 1.7, showing that the turbulent eddy viscosity was affected even more strongly than the eddy thermal diffusivity. This result corroborates previous work showing that boundary layer disturbances generally have a stronger effect on the eddy viscosity, rendering prescribed turbulent Prandtl number models ineffective in perturbed flows.
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Turbulent Heat Transport in a Perturbed Channel Flow
C. U. Buice,
C. U. Buice
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305
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J. K. Eaton
J. K. Eaton
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305
Search for other works by this author on:
C. U. Buice
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305
J. K. Eaton
Department of Mechanical Engineering, Stanford University, Stanford, CA 94305
J. Heat Transfer. May 1999, 121(2): 322-325 (4 pages)
Published Online: May 1, 1999
Article history
Received:
April 16, 1998
Revised:
January 12, 1999
Online:
December 5, 2007
Citation
Buice, C. U., and Eaton, J. K. (May 1, 1999). "Turbulent Heat Transport in a Perturbed Channel Flow." ASME. J. Heat Transfer. May 1999; 121(2): 322–325. https://doi.org/10.1115/1.2825983
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