食品减压冷冻保藏的理论与实验研究

在减压冷冻的环境中、通常用有限微分方程来模拟计算球体、无限大平板、无限长圆柱状食品中的非稳态的冷冻与传质过程。模拟计算涉及环境中水蒸气分压力、食品初始温度、水分子活性、食品表面及内部扩散力。食品中的含水量和温度变化可用这种方法预测、并又用实验验证了模型的准确性。

Theoretical and Experimental Investigation on Hypobaric and Refrigerated Preservation of Foodstuff

The finite difference method was used to simulate unsteady state cooling and mass transfer in spheres,infinite slabs and infinite cylinders of food materials in the hypobaric and refrigerated environment.Simulation was conducted across wide ranges of partial pressure of water vapor in the air ,product initial temperature,water activity,diffusivity,at food surface and effective diffusivity inside food.The changing of the moisture and temperature in the food could be predicted in this method,and the accuracy of model was testified in experiments.