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A round jet in an ambient co-axial stream

Published online by Cambridge University Press:  28 March 2006

J. F. J. Maczyński
J. F. J. Maczyński
Affiliation:
Department of the Mechanics of Fluids, University of Manchestert Present address : Instytut Podstawowych Problemow Techniki, Krakow, Poland.
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Abstract

Measurements were made of the mean velocity profiles in a jet immersed in a stream whose velocity was in the same direction as that of the jet. They showed a mean velocity on the jet axis falling inversely as the distance downstream of the jet origin, a behaviour demonstrably inconsistent with any theory which assumes that the turbulence at each section of the jet is in local equilibrium. A mixing length, LM, and a length, Ld, characterizing the rate of dissipation are defined and it is shown that LM increases with distance downstream more rapidly than the jet width, and Ld less rapidly.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 13 , Issue 4 , August 1962 , pp. 597 - 608
Copyright
© 1962 Cambridge University Press

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