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On the wake structure behind a heated horizontal cylinder in cross-flow

Published online by Cambridge University Press:  24 June 2003

RENE N. KIEFT ,
C. C. M. RINDT ,
A. A. van STEENHOVEN  and
G. J. F. van HEIJST
RENE N. KIEFT
Affiliation:
Department of Mechanical Engineering, Eindhoven University of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands
C. C. M. RINDT
Affiliation:
Department of Mechanical Engineering, Eindhoven University of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands
A. A. van STEENHOVEN
Affiliation:
Department of Mechanical Engineering, Eindhoven University of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands
G. J. F. van HEIJST
Affiliation:
Department of Physics, Eindhoven University of Technology, PO Box 513, Eindhoven 5600 MB, The Netherlands
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Abstract

This paper describes a numerical and experimental study of the effect of heat input on the behaviour of the vortices shed from a horizontal cylinder in a horizontal cross-flow. The Reynolds number (ReD) is fixed at 75, while the Richardson number (RiD) is varied between 0 and 1 (corresponding to forced and mixed convection, respectively). In this parameter regime the wake consists of a double row of alternately shed vortices. A rather unexpected effect of the induced heat is the downward motion of the shed vortex structures. Detailed experiments and numerical simulations show that this effect is caused by the difference in strength between the two vortex rows. An analysis of the vorticity sources present during the formation process shows that the thermally induced baroclinic vorticity production is mainly responsible for this.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 486 , 10 June 2003 , pp. 189 - 211
Copyright
© 2003 Cambridge University Press

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