高温金属熔液在旋转多孔介质内的渗流传热过程

HEAT TRANSFER OF MOLTEN METAL INFILTRATE THROUGH SiC PREFORM IN CENTRIFUGAL FORCE FIELD

针对转动坐标系中铝熔液在SiC多孔介质内的流动传热现象 ,考虑离心力对渗流传热过程的影响 ,采用局部非热平衡假设建立多孔介质渗流传热数理模型 ,研究不同工况下流体的流速、压力损失及铝熔液和多孔介质的温度变化 .计算结果表明 :在渗透区域 ,液固两相存在温差 ,且液固温差随渗透界面的移动而减小 ;在非渗透区域 ,固体的温度曲线基本不变 .离心转速或孔隙率的增加都使渗透前沿区域液固两相温差增大 .

In this paper,molten aluminum flow with heat transfer though SiC porous media in a centrifugal force field is described with a mathematical and physical model.The implicit TDMA Algorithm and first kind of first-order upwind difference were used to solve the conservation equation associated with appropriate boundary conditions.The distribution of molten aluminum velocity and pressure,the temperature field of flow and porous media in a centrifugal force field are examined for different conditions.The results show that local temperature of fluid phase is higher than that of solid phase.The temperature difference between fluid and solid decreases with the moving of infiltrated distance.The infiltration of molten aluminum through SiC porous media in the centrifugal force field depends greatly on the angular velocity and the temperature of preheated SiC porous media.SiC volume fraction has a strong effect on velocity and pressure drop of molten aluminum.