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The wall shear stress produced by the normal impingement of a jet on a flat surface

Phares, Denis J. and Smedley, Gregory T. and Flagan, Richard C. (2000) The wall shear stress produced by the normal impingement of a jet on a flat surface. Journal of Fluid Mechanics, 418 . pp. 351-375. ISSN 0022-1120.

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A method for the theoretical determination of the wall shear stress under impinging jets of various congurations is presented. Axisymmetric and two-dimensional incompressible jets of a wide range of Reynolds numbers and jet heights are considered. Theoretical predictions from this approach are compared with available wall shear stress measurements. These data are critically evaluated based on the method of measurement and its applicability to the boundary layer under consideration. It was found that impingement-region wall shear stress measurements using the electrochemical method in submerged impinging liquid jets provide the greatest accuracy of any indirect method. A unique wall shear stress measurement technique, based on observing the removal of monosized spheres from well-characterized surfaces, was used to conrm the impinging jet analysis presented for gas jets. The technique was also used to determine an empirical relation describing the rise in wall shear stress due to compressibility eects in impinging high-velocity jets.

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Additional Information:© 2000 Cambridge University Press. Received 24 May 1999 and in revised form 10 April 2000. Support for this work was provided by the FAA under Grant 93-G-060.
Record Number:CaltechAUTHORS:20111130-084030074
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28241
Deposited By: Tony Diaz
Deposited On:19 Jan 2012 22:44
Last Modified:26 Dec 2012 14:33

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