湿饱和多孔介质冻结过程中壁面效应的影响

EFFECT OF VARIABLE POROSITY NEAR THE WALL ON FREEZING HEAT TRANSFER IN LIQUID-SATURATED POROUS MEIDIA

采用节点跳跃技术的隐式数值焓法，对湿饱和多孔介质在第三类边界条件下发生的一维“双区域”导热控制型冻结过程进行求解，着重讨论了壁面效应的存在对冻结过程的影响．

The one-dimensional conduction-dominated freezing heat transfer problem has been numerically solved using the implicit enthalpy method with the node-jump technique.The effect of variable porosity near the wall on freezing heat transfer rate is presented and discussed for the first time.The results for glass bead saturated with water have shown that during the precooling period,there is no obvious effect of variable porosity on the freezing process,while during the freezing period.the variable porosity will enhance freezing heat transfer and obviously increase the freezing depth.