摘要
真空冷冻干燥过程中,从物料中升华出来的水分在真空泵的抽吸作用下,不断地在捕水器(也即冷阱)表面结霜,随着霜在捕水器表面不断凝结,致使其捕水效率不断降低,对真空系统形成不利的影响。但目前,对于低温、低压下的结霜机理研究极少,本文介绍了国内外有关低温冷壁面结霜的研究现状,并分析研究了真空冷冻干燥系统中冷壁面结霜过程中存在的问题。
Sublimed water from freeze-drying materials frost on cold trap continuously by vacuum pump on vacuum freeze-drying process. The arresting efficiency of cold trap became worse and worse along with frost coagulating,and it would be bad to vacuum pump. But at present, investigation about frosting mechanism under low temperature and low pressure condition is limited. In this paper the study state of the frost formed on cold wall was introduced, the problem of cold wall frost in vacuum freeze-drying system was also analyzed.
出处
《制冷空调与电力机械》
2007年第3期34-36,25,共4页
Refrigeration Air Conditioning & Electric Power Machinery
关键词
捕水器
结霜
传热传质
water catcher
frost
heat and mass transfer
