摘要
对纯水和ＮａＣｌ溶液在砂床中冷冻干燥的特性进行了实验研究，分析了冻干过程中砂床温度的分布特性，研究了在不同颗粒尺寸砂床中，溶液浓度对干燥时间的影响和干燥后非挥发性溶质在砂床中的分布．结果表明：该冷冻干燥过程中存在着溶质的迁移；ＮａＣｌ溶液在砂床中的干燥时间不仅受到升华界面蒸气压力降低的影响，且与溶质的析出和多孔物料空隙大小有关．
Pure water and aqueous solution of sodium chloride are freeze dried in non hygroscopic porous medium made of river sand. Temperature and solution concentration on drying time are investigated for different particle sizes. The distributions of non volatile component in the sand bed are measured after completion of the freeze drying process. Transports of non volatile solute due to entrainment are shown to be present. The drying time is influenced not only by vapor pressure descent in sublimation front but also solute separation and size of pores.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1999年第4期77-81,共5页
Journal of Xi'an Jiaotong University
