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

Deo, Ravinesh C. and Nathan, Graham Jerold 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: This publication is copyright. It may be reproduced in whole or in part for the purposes of study, research, or review, but is subject to the inclusion of an acknowledgment of the source. 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: 01 Dec 2014 05:00
Uncontrolled Keywords: turbulent plane jet; initial conditions; jet mixing ; jet flow; turbulence intensity
Fields of Research (FOR2008): 09 Engineering > 0915 Interdisciplinary Engineering > 091508 Turbulent Flows
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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