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RESEARCH PAPERS: Natural and Mixed Convection

Three-Dimensional Characterization of a Pure Thermal Plume

[+] Author and Article Information
Minh Vuong Pham, Frédéric Plourde, Son Doan Kim

Laboratoire d’Etudes Thermiques, Ecole Nationale Supérieure de Mécanique et d’Aérotechnique, Téléport 2, 1 Avenue Clément Ader, BP 40109, 86961 Futuroscope Cedex, France

J. Heat Transfer 127(6), 624-636 (Jun 06, 2005) (13 pages) doi:10.1115/1.1863275 History: Received September 01, 2004; Revised November 24, 2004; Online June 06, 2005
Copyright © 2005 by ASME
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References

Figures

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Schematic of thermal plume experiment
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Measurement setup using (a) classical 2D PIV technique and (b) stereoscopic PIV technique
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Radial profiles of the Uz̄ mean axial velocity component and λ plume width change with regard to z
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Normalized radial profiles of the uz mean axial velocity component
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Change of the normalized ūz,c/ūz,max mean axial velocity component along the geometrical axis
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Radial profiles of mean turbulent intensities: (a) Vertical velocity turbulent intensity, (b) radial velocity turbulent intensity, (c) circumferential velocity turbulent intensity, (d) It velocity turbulent intensity
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Mean turbulent intensity distribution: (a) Contour It in several planes, (b) variation of It along the geometrical axis
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Contour of instantaneous circumferential vorticity field close to the heating source
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Contour of instantaneous circumferential vorticity field far from the heating source
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Instantaneous velocity field of thermal plume obtained from stereoscopic PIV at z=5.0 during (a) expulsion phase and (b) contraction phase
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Balance of mean momentum: (a) at z=2.0, (b) at z=5.0
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Schematic of entrainment measurement: (a) Differential method, (a) direct method
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Mean velocity from PIV using two different time intervals between images: (a) Short time of 2 ms and (b) long time of 20 ms
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Contour of mean vertical velocity obtained by the stereoscopic measurements
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Variation of the flow rate along height: (a) Total flow rate, (b) entrained flow rate
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Variation of entrainment coefficient along vertical axis

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