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Momentum and heat transport in the turbulent intermediate wake of a circular cylinder

Published online by Cambridge University Press:  26 April 2006

M. Matsumura  and
R. A. Antonia
M. Matsumura
Affiliation:
Department of Applied Mechanical Engineering, Kitami Institute of Technology, Kitami, Hokkaido, 090, Japan
R. A. Antonia
Affiliation:
Department of Mechanical Engineering, University of Newcastle, NSW, 2308, Australia
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Abstract

Hot-wire anemometry has been used in the intermediate wake (x/d= 10 to 40) of a slightly heated circular cylinder in order to quantify the contribution from the coherent motion to various conventionally averaged quantities, in particular the average momentum and heat fluxes. The overall contribution to the lateral heat flux is always greater than that to the Reynolds shear stress, indicating that the turbulent Kármán vortex street transports heat more effectively than momentum. The difference in these contributions is reflected in the topologies of the velocity and temperature fields. There is significant streamwise evolution of these topologies throughout the intermediate wake. At x/d = 10, the net heat transport associated with the vortical motion occurs in the downstream region of each vortex. At other downstream stations, the net heat transport is equally distributed between the upstream and downstream regions of individual vortices.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 250 , May 1993 , pp. 651 - 668
Copyright
© 1993 Cambridge University Press

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