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Numerical study of heat and mass transfer of ammonia-water in falling film evaporator
Bu, Xianbiao1,2; Ma, Weibin1,2; Huang, Yuanfeng1,2
2012-05-01
Source PublicationHEAT AND MASS TRANSFER
Volume48Issue:5Pages:725-734
AbstractTo investigate the performance of the heat and mass transfer of ammonia water during the process of falling film evaporation in vertical tube evaporator, a mathematical model of evaporation process was developed and solved based on stream function. Then an experimental study of falling film evaporation was carried out in order to validate the mathematical model. A series of parameters, such as velocity, film thickness and concentration, etc., were obtained from the mathematical model. The calculated results show that the average velocity and the film thickness change sharp at the entrance region when x < 100 mm, while they vary slightly in the fully developed region when x > 100 mm. The film thickness depends largely on the flow rate of solution. It is observed that the heating power and mass flow of solution significantly affect the concentration difference between the inlet and outlet of evaporation tube. The calculated results reveal that the tube length has a significant impact on the amounts of ammonia vapor evaporated. It is suggested that the roll-worked enhanced tube should be used in order to decrease the concentration gradient in the film thickness direction and enhance the heat and mass transfer rate. Furthermore, the experimental and calculated results indicate that the inlet solution concentration has a great influence on the heat exchange capacity, the amounts of ammonia vapor evaporated and the evaporation pressure.
SubtypeArticle
WOS HeadingsScience & Technology ; Physical Sciences ; Technology
DOI10.1007/s00231-011-0923-4
WOS Subject ExtendedThermodynamics ; Mechanics
WOS KeywordVERTICAL TUBE ; TRANSFER-COEFFICIENTS ; MIXED CONVECTION ; LITHIUM BROMIDE ; ABSORPTION ; PERFORMANCE ; ABSORBER ; VAPOR ; FLOW
Indexed BySCI
Language英语
WOS SubjectThermodynamics ; Mechanics
WOS IDWOS:000303399500001
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Document Type期刊论文
Identifierhttp://ir.giec.ac.cn/handle/344007/10559
Collection中国科学院广州能源研究所
Affiliation1.Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangzhou 510640, Guangdong, Peoples R China
2.Chinese Acad Sci, Key Lab Renewable Energy & Gas Hydrate, Guangzhou 510640, Guangdong, Peoples R China
First Author AffilicationGuangZhou Institute of Energy Conversion,Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Bu, Xianbiao,Ma, Weibin,Huang, Yuanfeng. Numerical study of heat and mass transfer of ammonia-water in falling film evaporator[J]. HEAT AND MASS TRANSFER,2012,48(5):725-734.
APA Bu, Xianbiao,Ma, Weibin,&Huang, Yuanfeng.(2012).Numerical study of heat and mass transfer of ammonia-water in falling film evaporator.HEAT AND MASS TRANSFER,48(5),725-734.
MLA Bu, Xianbiao,et al."Numerical study of heat and mass transfer of ammonia-water in falling film evaporator".HEAT AND MASS TRANSFER 48.5(2012):725-734.
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