基于URIF模型的圆柱型物料冷冻干燥过程的二维模拟及验证

Numerical simulation and experimental study of column food in freeze-drying process basis on URIF model

通过冰界面均匀退却模型(URIF模型)的研究,建立了圆柱型物料的二维质热传递数学模型并进行数值模拟。采用变时间步长法对所建立的模型进行求解,获得物料内部的温度分布及水分升华速率。最后通过对胡萝卜的实验表明,实验结果与理论计算值能很好的吻合,从而验证了模型的正确性。这些工作比目前模型简单、适用范围窄的研究更进了一步,对工程实践具有一定的指导作用。

Through study on the uniformly retreating ice front model, establish model of the column, solve with changer-time way and getting the changer of the temperature and the velocity of sublimation. Through experiment study, the results of experiment and simulation can tally well, validating the correctness of the model. Compared with the present studies in which the model was constructed but not solved, or the model was solved, but too simple and could not be used widely, these works have made an advance. The result can guide operation in engineering practice.