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Measurement of local entrainment rate in the initial region of axisymmetric turbulent air jets

Published online by Cambridge University Press:  29 March 2006

B. J. Hill
B. J. Hill
Affiliation:
Mechanical Engineering Department, Imperial College, London
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Abstract

The local entrainment rate in the initial region of axisymmetric turbulent air jets has been measured by a novel method, which is an adaptation of the ‘porous-wall’ technique used by Ricou & Spalding (1961). The local entrainment rate, which is independent of the nozzle Reynolds number for values greater than 6 × 104, is strongly dependent upon the axial distance. At an axial distance of one nozzle diameter the local entrainment rate is only about one-third of that in the fully developed jet; the entrainment rate increases with increasing axial distance to reach the fully developed value at an axial distance of about thirteen nozzle diameters.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 51 , Issue 4 , 22 February 1972 , pp. 773 - 779
Copyright
© 1972 Cambridge University Press

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References

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