JP Journal of Heat and Mass Transfer
Volume 2, Issue 1, Pages 73 - 116
(February 2008)
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SIMULTANEOUS DETERMINATION OF TWO UNKNOWN THERMAL COEFFICIENTS OF A SEMI-INFINITE POROUS MATERIAL THROUGH A DESUBLIMATION MOVING BOUNDARY PROBLEM WITH COUPLED HEAT AND MOISTURE FLOWS
Eduardo A. Santillan Marcus (Argentina), Maria F. Natale (Argentina) and Domingo A. Tarzia (Argentina)
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Abstract: An analytical model of freezing (desublimation) of moisture in a porous
medium with an overspecified condition at the fixed face is considered
in order to determine simultaneously two unknown thermal coefficients
of a semi-infinite phase-change material. When the evaporation front is
experimentally determined, a moving boundary problem with coupled heat and
moisture flows (Luikov type equations) with eight heat parameters can be
considered. We obtain the explicit expression of the temperature of the two
phases and the mass-transfer potential in the humid region, and we also give
formulae for the two unknown thermal coefficients and the necessary and
sufficient condition for the parameters in order to obtain the existence of a
solution for 28 different cases. |
Keywords and phrases: Stefan problem, simultaneous determination of unknown thermal coefficients, phase-change process, Luikov equations, desublimation, heat-mass flow. |
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