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Jet diffusion from a circular nozzle above a solid plane

Published online by Cambridge University Press:  19 April 2006

M. R. Davis  and
H. Winarto
M. R. Davis
Affiliation:
School of Mechanical and Industrial Engineering, University of New South Wales, Kensington, Australia 2033
H. Winarto
Affiliation:
Department of Mechanical Engineering, University of Queensland, St Lucia, Australia 4067
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Abstract

The decay of a jet discharging from a circular nozzle parallel to and displaced from a solid surface is investigated under conditions where the transitional process from circular-jet flow to oblate wall-jet flow begins in the initial, transition or self-preserving regions of the original jet. The influence of displacement of the nozzle from the plane on the developed three-dimensional wall jet downstream is demonstrated and it is found that the transitional interaction with the plane is more extended when the plane interacts first in the initial zone of the circular jet. Measurements of turbulence and Reynolds stress show the transverse mixing parallel to the plane to exceed that perpendicular to the plane, and are generally consistent with the spreading rates in these two directions, the ratio of which approaches 8·5 at large distances from the nozzle. It is shown that the interaction between the plane and jet involves a relatively large-scale coherent motion in which components of velocity directed towards or away from the surface are associated with outflow or inflow along the surface. This motion is more extended in the direction parallel to the surface and provides a mechanism for the increases in mixing rate in the direction parallel to the plane.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 101 , Issue 1 , 13 November 1980 , pp. 201 - 221
Copyright
© 1980 Cambridge University Press

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