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Jet diffusion in the region of flow establishment

Published online by Cambridge University Press:  28 March 2006

Sedat Sami ,
Thomas Carmody  and
Hunter Rouse
Sedat Sami
Affiliation:
Institute of Hydraulic Research, The University of Iowa, Iowa City
Thomas Carmody
Affiliation:
Institute of Hydraulic Research, The University of Iowa, Iowa City
Hunter Rouse
Affiliation:
Institute of Hydraulic Research, The University of Iowa, Iowa City
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Abstract

In the flow-establishment region of an air jet issuing with an efflux velocity of about 35 ft./sec from a 1.0 ft. diameter nozzle into still air, measurements were made of mean axial and radial velocities, mean static pressure, turbulence intensities, turbulent shear, and pressure fluctuation. For the measurement of the latter a pressure probe using a ceramic piezo-electric tube was developed. Also included in the measurements were the temporal mean gradient and autocorrelation of the axial-velocity fluctuation and the intermittency factor. The fluctuating-pressure and turbulence-intensity fields were observed to be closely similar in form. Through use of the measured distributions of mean-flow and turbulence characteristics, all terms of the integral and differential forms of the momentum and mean-energy equations were evaluated throughout the region. The results are presented herein by curves of variation of each of the terms as they appear in the corresponding equations.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 27 , Issue 2 , 2 February 1967 , pp. 231 - 252
Copyright
© 1967 Cambridge University Press

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