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.