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MICROSCOPIC MODELING OF THE TWO-TEMPERATURE MODEL FOR CONDUCTION IN HETEROGENEOUS MEDIA

Volume 13, Numéro 2, 2010, pp. 125-143
DOI: 10.1615/JPorMedia.v13.i2.40
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RÉSUMÉ

We consider conduction in a two-phase composite solid or, equivalently, a stagnant porous medium saturated with a single fluid. In particular, we derive and calculate values for the interphase heat transfer coefficient, h, which multiplies the source/sink terms in the two-energy model for conduction in a porous medium. On allowing a uniform heat generation to take place within one of the phases, it is possible to determine h from the difference in the average temperatures of the two phases after the decay of transients. An exact analytical expression is obtained for periodic striped media, which suggests that a new nondimensional parameter might usefully be defined. Exact numerical solutions are obtained for randomly striped media. Precise expressions are also found for the two-dimensional checkerboard pattern and its three-dimensional analogue. We also consider other types of two-dimensional periodic media, and finally, randomly constituted media are analyzed.

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