Research Progress of Falling Film Evaporation of Cryogenic Fluid in Vertical Channels
Falling film evaporation, which is one efficient technology of heat and mass transfer, has been used in air separation field. The principles and characteristics of the main downflow condenser/reboiler in air separation are analyzed, the dynamic characteristics of falling film are illustrated from th...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Journal of Refrigeration Magazines Agency Co., Ltd.
2016-01-01
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| Series: | Zhileng xuebao |
| Subjects: | |
| Online Access: | http://www.zhilengxuebao.com/thesisDetails#10.3969/j.issn.0253-4339.2016.05.112 |
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| Summary: | Falling film evaporation, which is one efficient technology of heat and mass transfer, has been used in air separation field. The principles and characteristics of the main downflow condenser/reboiler in air separation are analyzed, the dynamic characteristics of falling film are illustrated from the aspects of the wave characteristics and breakdown characteristics, the influence of inlet flow rate, wall structure, components of working medium and heat flux density on the heat and mass transfer are reviewed in this paper. The occurrence regularity of critical heat flux and the dynamic characteristics of the superheated surface rewetting with liquid film for the progress of falling film of cryogenic liquid nitrogen in the large space plate are emphasized，some available heat transfer correlations for the progress of falling film evaporation in the vertical channels are concluded. Due to the speciality of physical property and channel structure, there is a significant gap applying the existing heat transfer correlations of working medium with normal temperature to the main downflow condenser/reboiler in air separation field. At last, it is pointed out that the further study of falling film evaporation of cryogenic fluid in the complex narrow channel under the small heat transfer temperature difference is needed. |
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| ISSN: | 0253-4339 |