摘要
通过实验,研究了冻干过程中干燥箱内压力和搁板温度对升华速度及升华温度的重要作用。实验结果表明:对于特定制品,若维持恒定升华温度而降低箱内压力,当压力低于某一值后,压力的降低不再加快升华速度。综合传热、传质因素及干燥过程对制品的作用,则存在最佳干燥条件。文中进一步讨论了实践中这一条件的取得。
Basing on the test results,the influences of chamber pressure and shelf temperature on sublimation rate and sublimation temperature are studied. When the chamber pressure is below a level for certain products,there is no increase of sublimation rate if decreasing chamber presuure with constant sublimation temperature.Considering heat and mass tansfer and the effects of drying on product,the optimum freeze-drying condition exists. The method to achieve the proper drying condition in practise is discussed further
出处
《制冷学报》
CAS
CSCD
1991年第4期27-31,共5页
Journal of Refrigeration
