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The near field in the mixing of a round jet with a cross-stream

Published online by Cambridge University Press:  11 April 2006

Z. M. Moussa ,
John W. Trischka  and
S. Eskinazi
Z. M. Moussa
Affiliation:
Carrier Corporation, Syracuse, New York 13201
John W. Trischka
Affiliation:
Department of Physics, Syracuse University, New York 13210
S. Eskinazi
Affiliation:
Department of Mechanical and Aerospace Engineering, Syracuse University, New York 13210
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Abstract

In the mixing of a jet with a cross-stream, it is found that in the near field, defined as the region of the flow from the jet exit to a distance of a few diameters downstream of this exit, a considerable amount of dynamical adjustment takes place. This near-field region characterizes the subsequent behaviour and development of the jet, its wake and the cross-stream in the vicinity of this mixing region. The rapid evolution of the flow gives rise to a pair of bound vortices attached to the lee side of the jet boundary, to fast development of the turbulent and mean vorticity, to a vortex-shedding system, and to the largest rates of entrainment of cross-stream flow into the jet. Furthermore, it is found that the geometrical configuration of the boundaries at the jet exit plays an important role in the mixing and development processes.

An intrinsic method is proposed for the delineation of the flow boundaries between the jet and the cross-stream. Calculations of mass, momentum and vorticity fluxes have been made. The vorticity flux gives evidence of the rapid stretching and tilting of the vorticity vector field in the near-field region.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 80 , Issue 1 , 4 April 1977 , pp. 49 - 80
Copyright
© 1977 Cambridge University Press

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