THE ANALYSIS OF THERMAL RESISTANCE OF THREE-DIMENSIONAL FRACTAL NETWORKS EMBEDDED IN A SPHERE

This paper presents a preliminary work to evaluate the thermal resistance of a spherical medium. In the sphere, a three-dimensional pore fractal network combined with electrical double layers is constructed to represent the pore structure of medium. The construction and structural parameters of a network are illustrated in detail. The thermal resistance of a sphere is primarily associated with structural parameters of network, pore structure parameters of medium, thermal conductivities of solid phase and pore channels. In this work, the evolution of thermal resistance with the fractal network is analyzed comprehensively. Besides, the evolution mechanisms of thermal resistance with pore structure parameters of medium are revealed. The influences of types of porous materials on thermal resistance are systematically studied.