3. Conductive heat transfer
3.1 Concept of effective thermal conductivity
If, under the action of a temperature gradient applied to a porous medium saturated by a single phase, the saturating non-reactive fluid remains stationary, heat transfer within the porous medium is purely conductive. It is then possible to define the effective thermal conductivity λ* using a relationship giving the heat flux density vector as a function of the thermal gradient analogous to Fourier's law for homogeneous media, i.e. :
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Conductive heat transfer
Convection heat transfer
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