THEORETICAL-ANALYSIS OF TRANSIENT HEAT-CONDUCTION IN SAND

A simplified two-phase system model, with the heat transfer between ph ases considered, is presented and applied to the transient heat conduc tion in sand. The analytical results show that the one-dimensional Fou rier's law is not applicable to the transient heat conduction at very short time and there is no thermal wave described by C-V equation in s and. The two-phase system model correlates with experimental data well . Each phase responds to heating at different speeds in composite mate rial, and consequently results in a temperature difference between pha ses. This difference will cause heat transfer between phases, which ca n be regarded as a heat source or sink to other phase. it is certain t hat Fourier's law cannot describe the transient heat conduction in san d if a one-dimensional problem with equivalent thermal diffusivity is assumed.