The influence of nozzle-exit geometric profile on statistical properties of a turbulent plane jet

Deo, Ravinesh C. and Mi, Jianchun and Nathan, Graham J. (2007) The influence of nozzle-exit geometric profile on statistical properties of a turbulent plane jet. Experimental Thermal and Fluid Science, 32 (2). pp. 545-559. ISSN 0894-1777

Abstract

The paper reports an investigation of the influence of geometric profile of a long slot nozzle on the statistical properties of a plane jet discharging into a large space. The nozzle-exit profile was varied by changing orifice-plates with different exit radii (r) over the range of 0 < r/h < 3.60, where h is the slot-height. The present measurements were made at a slot-height based Reynolds number (Reh) of 1.80 · 104 and a slot aspect ratio (span/height) of 72. The results obtained show that both the initial flow and the downstream flow are dependent upon the ratio r/h. A 'top-hat' mean exit velocity profile is closely approximated when r/h approaches 3.60. The decay and spread rates of the jet’s mean velocity decrease asymptotically as r/h is increased, with the differences becoming small as r/h approaches 3.60. A decrease in r/h results in a higher formation rate of the primary vortices in the near-field. The far-field values of the centerline turbulence intensity are higher for smaller r/h, and display asymptotic-like convergence as r/h approaches 3.60. Overall, the effect of r/h on the mean and turbulence fields decreases as r/h increases.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Author's version not held.
Depositing User: Dr Ravinesh C Deo
Faculty / Department / School: Historic - Faculty of Sciences - Department of Maths and Computing
Date Deposited: 15 Apr 2010 09:02
Last Modified: 02 Jul 2013 23:47
Uncontrolled Keywords: plane jet; turbulence structure; nozzle-exit geometry; turbulence statistics
Fields of Research (FOR2008): 09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
09 Engineering > 0999 Other Engineering > 099902 Engineering Instrumentation
09 Engineering > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Identification Number or DOI: doi: 10.1016/j.expthermflusci.2007.06.004
URI: http://eprints.usq.edu.au/id/eprint/7421

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