Natural convection in an annulus between coaxial horizontal cylinders with internal heat generation

Natural convection of gas ( Pr = 0.7) between two horizontal coaxial cylinders with uniform internal heat generation is numerically investigated. Such a problem plays an important role in the analysis of lasers in which a similar circuit of a heat-conducting path is used. It has been found that the...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2005-10, Vol.48 (21), p.4518-4525
Main Authors: Roschina, N.A., Uvarov, A.V., Osipov, A.I.
Format: Article
Language:English
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Summary:Natural convection of gas ( Pr = 0.7) between two horizontal coaxial cylinders with uniform internal heat generation is numerically investigated. Such a problem plays an important role in the analysis of lasers in which a similar circuit of a heat-conducting path is used. It has been found that the behavior of the system critically depends on three parameters including the inverse relative gap width σ(=diameter of the inner cylinder/gap width), the Rayleigh number Ra and the modified Rayleigh number Ra T which describes heat generation. In the case Ra T = 0 our results coincide with the known ones. It has been established that in such a system there exist two types of fluid flow for low Rayleigh numbers with different vortex structure. Optimization of the corresponding coaxial laser system has been analyzed.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2005.05.035