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The effect of a circular cylinder on the diffusion of matter by a plume

Published online by Cambridge University Press:  26 April 2006

H. Tsunoda ,
Y. Sakai ,
I. Nakamura  and
S. Liu
H. Tsunoda
Affiliation:
Department of Mechanical Engineering, Nagoya University, Nagoya 464-01, Japan
Y. Sakai
Affiliation:
Department of Mechanical Engineering, Nagoya University, Nagoya 464-01, Japan
I. Nakamura
Affiliation:
Department of Mechanical Engineering, Nagoya University, Nagoya 464-01, Japan
S. Liu
Affiliation:
Department of Mechanical Engineering, Nagoya University, Nagoya 464-01, Japan Present address: Research and Development Division. ULVAC Japan Co. Ltd., Chigasaki. Kanagawa 253, Japan.
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Abstract

Experimental results are given for the mean and fluctuation concentration in a plume from a point source in grid-generated turbulence, which has developed so as to have a width comparable to the cylinder diameter, is disturbed by a cylinder with its axis intersecting the plume axis perpendicularly. It is shown that the disturbance effect of the cylinder appears in the upstream region of about 1.5 diameter from the stagnation point. As the stagnation point is approached, the increased travel time and the enhanced molecular diffusion cause a noticeable amplification of the dissipation of concentration variance. Also, the characteristics of some conditional statistics of the plume entrained in the wake are examined in order to investigate the intermittent structure of the plume meandering produced by the Kármán vortex street.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 246 , January 1993 , pp. 419 - 442
Copyright
© 1993 Cambridge University Press

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