鼓风冻结虾仁时间的数值模拟及实验验证

食品冻结时间对速冻食品的质量和速冻过程的能耗有着重要影响。为弥补实验测量耗时耗材局限性大的缺陷，该文采用计算流体力学（CFD），对虾仁在鼓风冻结装置中的冻结过程及冻结时间进行了二维非稳态模拟。实验验证表明模型与实际吻合较好，冻结过程中最大温差1.5℃，冻结时间差异百分比为3.8%。在此基础上，还对可能影响食品冻结时间的多个参数（吹风方式，吹风速度，送风温度）进行了模拟研究，结果表明：相比于单侧送风，上下同时吹风的方式大大提高食品换热系数，从而大幅缩短冻结时间；上吹风速度恒定时，随着下吹风速度增大，冻结速率加快；降低送风温度，冻结时间明显减少，但减少的幅度随着冻结温度的降低而不断减小。

Numerical simulation of freezing time of shelled shrimps in an air blast freezer and experimental verification

Freezing time has great influence on the quality of foods and energy consumption in the quick-freezing process. In order to compensate the defects of consuming of time and materials and great limitation for test, computational fluid dynamics (CFD) technology is employed for more effectiveness and convenience. In this paper, a two-dimension unsteady mathematical model was established to simulate the heat transfer process of the quick-freezing of shelled fresh shrimps and the freezing time in an air blast fre...