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Mass transfer between a plane surface and an impinging turbulent jet: the influence of surface-pressure fluctuations

Published online by Cambridge University Press:  20 April 2006

K. Kataoka ,
Y. Kamiyama ,
S. Hashimoto  and
T. Komai
K. Kataoka
Affiliation:
Department of Chemical Engineering, Kobe University, Kobe 657, Japan
Y. Kamiyama
Affiliation:
Department of Chemical Engineering, Kobe University, Kobe 657, Japan
S. Hashimoto
Affiliation:
Department of Chemical Engineering, Kobe University, Kobe 657, Japan
T. Komai
Affiliation:
Department of Chemical Engineering, Kobe University, Kobe 657, Japan
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Abstract

Local measurement of the mass-transfer rate and velocity gradient when an axisymmetric jet impinges on a flat plate was carried out using an electrochemical technique. Local measurement of the surface pressure on the flat plate was carried out separately using piezoelectric pressure transducers. The stagnation-point mass-transfer coefficient reaches a maximum when the flat plate is placed at 6 nozzle diameters from a convergent nozzle. It has been confirmed that the mass transfer to the flat plate for a high Schmidt number is greatly enhanced owing to the velocity-gradient disturbances in the wall region of the boundary layer, while the momentum transfer is insensitive to such disturbances. The relative intensity of the velocity-gradient fluctuations on the wall has an extremely large value at and near to the stagnation point, and decreases downstream, approaching a large constant value.

These velocity-gradient disturbances are not due to the usual interaction of Reynolds stress with the shear stress of the mean flow, but are due to the interaction with the surface-pressure fluctuations converted from the velocity fluctuations of the oncoming jet.

The three co-ordinate dimensions of large-scale eddies are calculated from the auto- and spatial correlations of the surface-pressure fluctuations. It is considered that such large-scale eddies play an important role in the production of a velocity-gradient disturbance in the wall region of the boundary layer from the velocity turbulence of the approaching jet.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 119 , June 1982 , pp. 91 - 105
Copyright
© 1982 Cambridge University Press

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