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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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References

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Ghaddar,  N. K., 1992, “Natural Convection Heat Transfer Between a Uniformly Heated Cylindrical Element and Its Rectangular Enclosure,” Int. J. Heat Mass Transf., 35, No. 10, pp. 2327–2334.
Dalton, T. M., and Davies M. R. D., 1996, “An Experimental and Numerical Investigation of Natural Convection Plumes Above a Horizontal Cylinder in an Isothermal Enclosure,” HTD-Vol. 329, National Heat Transfer Conference, 7 , pp. 3–10.
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Figures

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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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