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research-article

The effect of the nozzle top lip thickness on a two-dimensional wall jet

[+] Author and Article Information
Rory McIntyre

Department of Mechanical and Materials Engineering, University of Western Ontario, 1151 Richmond St, London, Ontario, N6A 3K7, Canada
rmcinty2@alumni.uwo.ca

Eric Savory

Department of Mechanical and Materials Engineering, University of Western Ontario, 1151 Richmond St, London, Ontario, N6A 3K7, Canada
esavory@uwo.ca

Hao Wu

Turbulence and Energy Laboratory, Centre for Engineering Innovation, University of Windsor, 401 Sunset Ave, Windsor, Ontario, N9B 3P4, Canada
wu15f@uwindsor.ca

David S.-K. Ting

Turbulence and Energy Laboratory, Centre for Engineering Innovation, University of Windsor, 401 Sunset Ave, Windsor, Ontario, N9B 3P4, Canada
dting@uwindsor.ca

1Corresponding author.

ASME doi:10.1115/1.4041560 History: Received April 23, 2018; Revised September 20, 2018

Abstract

The effect of the nozzle top lip thickness on a two-dimensional wall jet was examined experimentally in a wind tunnel using hot-wire anemometry. Lip thicknesses of 0.125b, 0.5b, 1b and 2b, where b is the jet height, were considered at a Reynolds number of 30700 based on the jet height and jet velocity. Noticeable differences in the flow profiles were observed at the jet outlet, but by 10b downstream these differences became insignificant. Although different lip thicknesses resulted in different maximum velocity decay rates, no clear trend was observed. It is speculated that the thinner lips generated shearing flow, while the thicker lips produced wake flow. The spread of the wall jet was found to be insensitive to the lip thickness.

Copyright (c) 2018 by ASME
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