平板状食品冻结时间的数值预测

Numerical Prediction of Freezing Time for Slab shape Food

采用有限差分法获得平板状食品冻结时间的数值解。对凝固区（两相区）的参数进行处理，使食品在整个冻结过程可以选用统一的差分格式；通过凝固区释放热量的累积效果，判断凝固区界面的移动；对常见的平板状食品的冻结过程进行计算机模拟来预测冻结时间，并通过实验来验证可靠度。结果表明，这种计算方法可以应用在实际生产中。

The explicit finite difference method is used to perform numerical prediction of freezing time of slab shape food in this paper. In order to choose the same explicit finite difference form during the freezing, thermophysical properties of freezing zone are processed. The moving of the freezing boundary is judged according to the heat accumulating result of the freezing zone. Temperature is predicted by computer for the slab shape food during the freezing. Experiments are designed to prove its reliability. The result demonstrates the method can be used in practical production.