A model is presented for thermal convection in an inclined layer of porous material when the medium has a bidispersive structure. Thus, there are the usual macropores which are full of a fluid, but there are also a system of micropores full of the same fluid. The model we employ is a modification of the one proposed by Nield &
We derive, using the entropy maximum principle, an expression for the distribution function of carriers as a function of a set of macroscopic quantities ͑density, velocity, energy, deviatoric stress, heat flux͒. Given the distribution function, we can obtain a hydrodynamic model in which all the constitutive functions ͑fluxes and collisional productions͒ are explicitly computed starting from their kinetic expressions. We have applied our model to the simulation of the thermodynamic properties of bulk silicon and of some n ϩ nn ϩ submicrometer Si devices ͑with several doping profiles and applied biases͒, obtaining results comparable with Monte Carlo simulations. Computation times are of order of few seconds for a picosecond of simulation. ͓S0163-1829͑98͒01607-5͔
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