冷冻干燥升华过程数学模型传热传质机理

A MATHEMATICS MODEL AND ITS HEAT AND MASS TRANSFER ANALYSIS OF THE FREEZE DRYING SUBLIMATION PROCESS

提出冷冻干燥升华过程主要由传热控制和传质过程两阶段组成．分析认为升华过程是传热传质的逆过程，并得出该过程的合理工艺条件。

This paper proposed that there are two stages in sublimation process: the heat transfer controlled stage and the mass transfer controlled stage. We consider the sublimation as an inverse procedure of coupled heat and mass transfer process. In this way the typical pattern of porous medium surface temperature and that of drying chamber pressure can be obtained easily.