Measurements of the Free Surface Flow Structure Under an Impinging, Free Liquid Jet

[+] Author and Article Information
J. Stevens, B. W. Webb

Heat Transfer Laboratory, Brigham Young University, Provo, UT 84602

J. Heat Transfer 114(1), 79-84 (Feb 01, 1992) (6 pages) doi:10.1115/1.2911271 History: Received February 19, 1991; Revised June 30, 1991; Online May 23, 2008


The objective of this research was to characterize the flow structure under an impinging liquid jet striking a flat, normally oriented surface. The approach was the measurement of the free surface velocities of the jet prior to impingement and the surface velocities of the radially spreading liquid layer. A novel laser-Doppler velocimetry technique was used. The LDV system was configured such that the measurement volume would span the time-dependent fluctuations of the free surface, with the surface velocity being measured. The mean and fluctuating components of a single direction of the velocity vector were measured. It was found that the radial liquid layer data collapsed well over the range of jet Reynolds numbers 16,000 < Re < 47,000 if plotted in dimensionless coordinates, where the measured velocity was normalized by the average jet exit velocity and the radial coordinate was normalized by the nozzle diameter. Mean liquid layer depths were inferred from the velocity measurements by assuming a velocity profile across the layer, and were reported. Pre-impingement jet measurements suggest that the flow development is nearly complete two diameters from the nozzle exit.

Copyright © 1992 by The American Society of Mechanical Engineers
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