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https://hdl.handle.net/2440/41915
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Type: | Journal article |
Title: | The influence of nozzle-exit geometric profile on statistical properties of a turbulent plane jet |
Author: | Deo, R. Mi, J. Nathan, G. |
Citation: | Experimental Thermal and Fluid Science, 2007; 32(2):545-559 |
Publisher: | Elsevier Science Inc |
Issue Date: | 2007 |
ISSN: | 0894-1777 |
Statement of Responsibility: | Ravinesh C. Deo, Jianchun Mi and Graham J. Nathan |
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. |
Keywords: | Nozzle-exit geometry Plane jet Turbulence structure Turbulence statistics |
Description: | © 2007 Published by Elsevier Inc. |
DOI: | 10.1016/j.expthermflusci.2007.06.004 |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/505737/description#description |
Published version: | http://dx.doi.org/10.1016/j.expthermflusci.2007.06.004 |
Appears in Collections: | Aurora harvest Environment Institute Leaders publications Mechanical Engineering publications |
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