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Convective behaviour of a uniformly Joule-heated liquid pool in a rectangular cavity

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Title Convective behaviour of a uniformly Joule-heated liquid pool in a rectangular cavity
 
Creator SUGILAL, G
WATTAL, PK
IYER, K
 
Subject 3-dimensional mathematical-model
volumetric energy-sources
thermal-convection
fluid layer
field
flow
joule heating
internal heat generation
natural convection
magnetohydrodynamic flow
heat transfer
 
Description A two-dimensional mathematical model has been developed to study the interaction between gravitational body force and self-induced electromagnetic body force in a Joule-heated liquid pool in a rectangular cavity, with an aspect ratio of 2. The Joule heating of the liquid pool in the cavity is accomplished by passing a large alternating current employing a pair of plate electrodes immersed in the liquid. The electrode surfaces are assumed to be isopotential and rest of the boundaries is treated as electrically insulated. The upper boundary of the liquid pool is an isothermal boundary while the rest of the boundaries are assumed to be thermally insulated. The present study investigates the convective behaviour of different liquids under Joule heating. Numerical simulations have been carried out employing Boussinesq fluids for Rayleigh numbers up to 2.5 x 10(5) and Hartmann numbers up to 4 x 10(7). This study shows that the heat transfer in the uniformly Joule-heated liquid is governed by the gravitational body force when Ha(2)Pr/root Ra < 120 and by the self-induced electromagnetic body force when Ha(2)Pr/Ra > 100. It also indicates that the thermal field is strongly dependent on Pr in electromagnetically driven flows while Pr has negligible effect on temperature field in thermally driven flows for 10(3) >= Pr >= 10. Heat transfer correlations for thermally driven flows, electromagnetically driven flows and combined flows are also presented. (c) 2005 Elsevier SAS. .
 
Publisher ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
 
Date 2011-07-21T16:29:15Z
2011-12-26T12:52:05Z
2011-12-27T05:39:03Z
2011-07-21T16:29:15Z
2011-12-26T12:52:05Z
2011-12-27T05:39:03Z
2005
 
Type Article
 
Identifier INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 44(10), 915-925
1290-0729
http://dx.doi.org/10.1016/j.ijthermalsci.2005.03.012
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5922
http://hdl.handle.net/10054/5922
 
Language en