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Abstract: The thermal properties (thermal conductivity, thermal diffusivity, and specific heat) were measured for igneous and sedimentary rocks at room temperature and atmospheric pressure. The thermal properties of the igneous rocks, dunite and gabbro, were then measured at temperatures ranging from 293 K to 483 K and 293 K to 443 K, respectively. A predictive model was then developed for estimating the effective thermal conductivity of porous media using the thermal conductivities of the solid phase, and the fluid in the pore spaces, as well as the fractional porosity. This predictive model is then further developed to incorporate the effect of temperature on the effective thermal conductivity. A formula was also presented for the exponential decay of effective thermal conductivity of porous media under ambient conditions. The results of these models were compared with results from previously developed models.

Reference: PhD Dissertation, Quaid-i-Azam University, 2009.