多孔質材による能動的冷却と熱応力の緩和 : 中空円筒モデルによる検討

抄録

By using the thermo-poro-elastic theory proposed previously by the author, thermal stresses are analyzed which are induced in a fluid-saturated porous hollow cylinder whose inner surface is heated by burning gas, the wall of which is cooled by the fluid injection from its ourter surface. Two stories of loading conditions are considered : (A) the cylinder is subjected to a sudden rise in temperature of the gas and simultaneously pressurized at its outer surface to cool the wall, and (B) steady state cooling is abruptly disturbed by a sudden loss of pressurization, and after a while it is recovered. Main attention is placed on the effect of heat advection due to active fluid injection on the reduction of temperature and thermal stresses. Since the formulated problem is axisymmetric, the displacement field is decoupled from the temperature and pore-pressure fields, which are still coupled to each other. The coupled nonlinear diffusion equations are solved by the Crank-Nicolson implicit method.