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A study of free jet impingement. Part 2. Free jet turbulent structure and impingement heat transfer

Published online by Cambridge University Press:  29 March 2006

Coleman Dup. Donaldson ,
Richard S. Snedeker  and
David P. Margolis
Coleman Dup. Donaldson
Affiliation:
Aeronautical Research Associates of Princeton, Inc., Princeton, New Jersey
Richard S. Snedeker
Affiliation:
Aeronautical Research Associates of Princeton, Inc., Princeton, New Jersey
David P. Margolis
Affiliation:
Aeronautical Research Associates of Princeton, Inc., Princeton, New Jersey
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Abstract

An experimental study of jet impingement is completed with the presentation of the measured turbulent characteristics of the circular subsonic jet and the heat transfer rates measured when this jet impinges normal to a flat plate. The data suggest that for impingement very close to the stagnation point, the heat transfer can be computed by applying a turbulent correction factor to the laminar value calculated for a flow having the same pressure distribution as that present in the impingement region. The correction factor is found to be a function of the axial distance and not of Reynolds number. Farther away, the measurements agree well with the heat transfer estimated using the method of Rosenbaum & Donaldson (1967). At large distances from the stagnation point, the heat transfer falls off in inverse proportion with the distance.

The documentation of the turbulent jet flow field includes measurements of the radial and axial velocity fluctuations and their spectra, as well as the radial distribution of turbulent shear $\overline{w^{\prime}u^{\prime}}$. In addition, measurements of the turbulence near the stagnation point and the total pressure fluctuation at the stagnation point are presented.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 45 , Issue 3 , 15 February 1971 , pp. 477 - 512
Copyright
© 1971 Cambridge University Press

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