JP Journal of Heat and Mass Transfer
Volume 1, Issue 3, Pages 251 - 270
(October 2007)
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DETERMINATION OF ONE UNKNOWN THERMAL COEFFICIENT OF A SEMI-INFINITE POROUS MATERIAL THROUGH A DESUBLIMATION PROBLEM WITH COUPLED HEATAND MOISTURE FLOWS
Eduardo A. Santillan Marcus (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 determinate one unknown thermal coefficient of a semi-infinite
phase-change material. It can be considered as a free boundary problem in which
coupled heat and moisture flows (Luikov type equations) with eight heat
parameters. We obtain the explicit expression
of the temperature of the two phases, the mass-transfer potential in the humid
region and the phase-change interface, and we also give formulae for the unknown
coefficients and the necessary and sufficient conditions for the existence of a
solution.
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Keywords and phrases: Stefan problem,
unknown thermal coefficients, phase-change process, Luikov equations,
desublimation, heat-mass flow. |
Communicated by Chin-Hsiang Cheng |
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