辐射传热冷冻干燥速率的简捷估算

对Sheng 和Peck的辐射传热冷冻干燥模型进行简化，将该模型中升华阶段物料干燥层的误差函数温度分布近似为线性分布。计算表明，其结果与实验值及Sheng和Peck模型的预测值很接近。这种冷冻干燥过程中物料含水率和温度分布的简捷估算方法，在工程应用中十分方便。

Estimation of the Rates for Freeze-Drying with Heat Radiation

A simplification for Sheng and Peck's freeze-drying model with heat radiation has been made in this paper.Linear distribution of temperature within the dried layer during sublimation is assumed instead of the error function profile proposed by Sheng and Peck.Therefore,an explicit expression for predicting the time required to remove the free water and the bound water in products during a freeze-drying process has been developed.The model suggests that sublimation and desorption may take place simultaneously in the sublimation stage.Good agreement has been found by comparing with Sheng and Peck's prediction data for freeze-drying of beef and poultry meat.The method is suitable for engineering application because of its simplicity.