TECHNICAL PAPERS: Natural and Mixed Convection

On the Thermal Interaction Between an Isothermal Cylinder and Its Isothermal Enclosure for Cylinder Rayleigh Numbers of Order 104

[+] Author and Article Information
D. T. Newport, T. M. Dalton, M. R. D. Davies

PEI Technologies: Stokes Research Institute, Dept. Mechanical & Aeronautical Engineering, University of Limerick, Limerick, Ireland

M. Whelan, C. Forno

Institute for Systems, Informatics & Safety, Joint Research Center, European Commission, Ispra, Italy

J. Heat Transfer 123(6), 1052-1061 (Mar 08, 2001) (10 pages) doi:10.1115/1.1389467 History: Received January 31, 2000; Revised March 08, 2001
Copyright © 2001 by ASME
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Schematic of the Michelson interometer
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Sample interferogram of a horizontal isothermal cylinder at Ra=7.1×103
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Refraction effects in the Michelson interferometer
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Schematic of Mach-Zehnder interferometer
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Mach-Zehnder interferogram of a horizontal cylinder at Ra=1.04×104
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Phase-stepped horizontal cylinder
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Obtaining a Moiré interferogram for a plume impinging on the upper interior surface of an enclosure: (a) disturbed pattern; (b) initial pattern; and (c) plume impinging on upper surface of enclosure.
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Detail of geometry used in experimentation
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Geometry and solver grid of numerical model
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Example of gridding about the cylinder. Shows the cuboid construction of the cylinder.
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Comparison of optical and numerical isotherms: (a) Ra=6.80×103; (b) Ra=1.04×104; and (c) Ra=1.66×104.
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Comparison of non-dimensional temperature distribution with the literature. Refs. [272829] cited in figure.
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Measured and predicted Nusselt number distribution at four different Rayleigh numbers, over the cylinder, shown as a polar plot, and over the inner surface of the enclosure, shown as a linear plot



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