Investigation of the flow field of a highly heated jet of air

Anderson, Susan M. and Bremhorst, Klaus (2002) Investigation of the flow field of a highly heated jet of air. International Journal of Heat And Fluid Flow, 23 2: 205-219. doi:10.1016/S0142-727X(01)00150-3


Author Anderson, Susan M.
Bremhorst, Klaus
Title Investigation of the flow field of a highly heated jet of air
Journal name International Journal of Heat And Fluid Flow   Check publisher's open access policy
ISSN 0142-727X
Publication date 2002-04-01
Sub-type Article (original research)
DOI 10.1016/S0142-727X(01)00150-3
Open Access Status
Volume 23
Issue 2
Start page 205
End page 219
Total pages 15
Place of publication Westminster, England
Publisher Elsevier Science Inc
Language eng
Subject C1
780102 Physical sciences
240502 Fluid Physics
Abstract Measurements of mean and fluctuating velocity and temperature and their self- and cross-products to the third-order are presented for a heated axisymmetric air jet. Froude numbers in the range of 3500 13,190, Reynolds numbers in the range of 3470-8500 and non-dimensional streamwise distances. X*, from 0.27 to 1.98 are covered by the data. It was found that turbulence intensity decreases for the heated jet in the region between the inertia dominated and the buoyancy dominated regions which is contrary to findings with helium jets mixing with ambient air to produce density fluctuations. The effects of heating on the turbulent kinetic energy budget and the temperature variance budget show small differences for the inertia dominated region and the intermediate region which help to explain the transition process to the far field plume region. Constants are evaluated for the isotropic eddy diffusivity and generalised gradient hypothesis models as well as the scalar variance model. No significant effect of heating on the dissipation time-scale ratio was found. A novel wire array with an inclined cold wire was used. Measurements obtained with this probe are found to lead to asymmetries in some of the higher-order products. Further investigation suggested that the asymmetries are attributable to an as yet unreported interference effect produced by the leading prong of the inclined temperature wire, The effect may also have implications for inclined velocity wires which contain a temperature component when used in heated flows. (C) 2002 Elsevier Science Inc. All rights reserved.
Keyword Thermodynamics
Engineering, Mechanical
Mechanics
Heated Axisymmetric Jet
Variable Density Jet
Hot Wire Anemometer
Cold Wire Anemometer
Dissipation Time-scale Ratio
Diffusivity And Scalar Variance Model Constants
Density Turbulent Jets
Buoyant Jets
Temperature
Velocity
Fluctuations
Prediction
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 15 Aug 2007, 03:47:40 EST