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
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Official URL: http://dx.doi.org/10.1016/j.expthermflusci.2007.06.004
Identification Number or DOI: doi: 10.1016/j.expthermflusci.2007.06.004
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.
|Item Type:||Article (Commonwealth Reporting Category C)|
|Additional Information:||Author's version not held.|
|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|
|Deposited On:||15 Apr 2010 19:02|
|Last Modified:||21 Feb 2012 16:28|
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