A highly conductive porous medium for solid-gas reactions: Effect of the dispersed phase on the thermal tortuosity

The heat transfer in a highly conductive material constituted by a graphite matrix in which a granular phase is dispersed is studied. The effective th ermal conductivity of this anisotropic porous composite medium used in soli d-gas reactors can vary largely with the component fractions. The effect of the dispersed grains on the deformable structure of the matrix is consider ed. A model developed on the basis of thermal tortuosity by analogy with ma ss transfer is adequately correlated with experimental results.