摘要
基于升华冷凝模型，对非饱和含湿多孔介质微波冷冻干燥过程作了数值计算．结果表明，干燥过程中不饱和含冰区内的冰饱和度有较大变化．通过与不考虑升华冷凝区相比较，表明升华冷凝区的存在不可忽略．
The sublimation and condensation phenomena caused by vapor movement in the pores partially filled with ice during microwave freeze drying of unsaturated porous media is studied. By the use of a sublimation-condensation model developed by the authors in a previous paper,the numerical simulation of heat and mass transfer process for frozen beef under microwave heating is made. The results show that the saturation of ice in sublimation-condensation region would decrease greatly during the microwave freeze drying.The calculation also indicates that the influence of sublimation-condensation region is significant and should not be neglected in microwave freeze drying process as compared with the numerical results of a sublimation interface model under the same operation condition.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1996年第2期131-136,共6页
CIESC Journal
基金
国家自然科学基金
关键词
冷冻干燥
微波加热
多孔介质
传热
传质
sublimation-condensation region,freeze drying,microwave heating,porous media
