On the influence of initial conditions on a turbulent plane jet: the role of nozzle exit area

Deo, Ravinesh C. and Nathan, Graham J. and Mi, Jianchun (2010) On the influence of initial conditions on a turbulent plane jet: the role of nozzle exit area. In: 17th Australasian Fluid Mechanics Conference (AFMC 2010), 5-9 Dec 2010, Auckland, New Zealand.

Abstract

The dependence of statistical flow properties of a turbulent plane jet on the nozzle-exit area was investigated experimentally. Jet flows from three plane nozzles were measured using hot wire anemometry at an identical Reynolds number (Re = Uco H / nu) of 9,000 and nozzle aspect ratio of 36, but with nozzle-exit areas of A = 900 mm2, 3600 mm2 and 14400 mm2, whereby Uo,c was the mean exit velocity, nu was the kinematic viscosity of air, and H was the slot opening width. Results demonstrated a longer potential core and a higher decay rate for the case with a larger nozzle-exit area. The centerline turbulence intensity (u*) showed a strong dependence on A in the near field but this dependence weakened progressively as the jet propagated downstream. The jet flow from the nozzle with a larger exit area produced a relatively higher near field turbulence intensity, indicating a significant dependence of near field vortical structures on the nozzle-exit area. The centerline turbulence intensity profiles became selfsimilar, collapsing on a single curve only for x/H >= 10. Overall, the dependence of the mean and turbulent velocity field on nozzle-exit area was significant, confirming the influence of initial and boundary conditions.


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: No evidence of copyright restrictions preventing deposit. This article has been refereeed and published in proceedings. Please see http://www.mech.unimelb.edu.au/people/staffresearch/AFMS%20site/17/369_Paper.pdf
Depositing User: Dr Ravinesh C Deo
Faculty / Department / School: Historic - Faculty of Sciences - Department of Maths and Computing
Date Deposited: 20 Apr 2011 01:11
Last Modified: 21 May 2013 06:12
Uncontrolled Keywords: turbulent plane jet; initial conditions; jet mixing
Fields of Research (FOR2008): 09 Engineering > 0915 Interdisciplinary Engineering > 091504 Fluidisation and Fluid Mechanics
01 Mathematical Sciences > 0102 Applied Mathematics > 010207 Theoretical and Applied Mechanics
Socio-Economic Objective (SEO2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/18484

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