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

Deo, Ravinesh C. ORCID: https://orcid.org/0000-0002-2290-6749 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: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Historic - Faculty of Sciences - Department of Maths and Computing (Up to 30 Jun 2013)
Faculty/School / Institute/Centre: Historic - Faculty of Sciences - Department of Maths and Computing (Up to 30 Jun 2013)
Date Deposited: 20 Apr 2011 01:11
Last Modified: 21 Oct 2022 00:08
Uncontrolled Keywords: turbulent plane jet; initial conditions; jet mixing ; jet flow; turbulence intensity
Fields of Research (2008): 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
Fields of Research (2020): 40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401213 Turbulent flows
40 ENGINEERING > 4012 Fluid mechanics and thermal engineering > 401299 Fluid mechanics and thermal engineering not elsewhere classified
49 MATHEMATICAL SCIENCES > 4901 Applied mathematics > 490109 Theoretical and applied mechanics
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
URI: http://eprints.usq.edu.au/id/eprint/18484

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