Knowledge Management System Of Guangzhou Institute of Energy Conversion, CAS
Heat and mass transfer of ammonia-water in falling film evaporator | |
Bu Xianbiao; Ma Weibin; Li Huashan | |
2011 | |
发表期刊 | Frontiers in Energy |
ISSN | 2095-1701 |
卷号 | 5期号:4页码:358 |
摘要 | To investigate the performance of 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 presented, the solution of which that needed a coordinate transformation was based on stream function. The computational results from the mathematical model were validated with experimental data. Subsequently, a series of parameters, such as velocity, film thickness and concentration, etc., were obtained from the mathematical model. Calculated results show that the average velocity and the film thickness change dramatically at the entrance region when x < 100 mm, while they vary slightly with the tube length in the fully developed region when x > 100 mm. The average concentration of the solution reduces along the tube length because of evaporation, but the reducing tendency becomes slow. It can be concluded that there is an optimal relationship between the tube length and the electricity generated. The reason for the bigger concentration gradient in the y direction is that the smooth tube is chosen in the calculation. It is suggested that the roll-worked enhanced tube or other enhanced tube can reduce the concentration gradient in the film thickness direction and enhance the heat and mass transfer rate. |
关键词 | falling film evaporation ammonia-water heat and mass transfer |
语种 | 英语 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.giec.ac.cn/handle/344007/34279 |
专题 | 中国科学院广州能源研究所 |
作者单位 | 中国科学院广州能源研究所 |
第一作者单位 | 中国科学院广州能源研究所 |
推荐引用方式 GB/T 7714 | Bu Xianbiao,Ma Weibin,Li Huashan. Heat and mass transfer of ammonia-water in falling film evaporator[J]. Frontiers in Energy,2011,5(4):358. |
APA | Bu Xianbiao,Ma Weibin,&Li Huashan.(2011).Heat and mass transfer of ammonia-water in falling film evaporator.Frontiers in Energy,5(4),358. |
MLA | Bu Xianbiao,et al."Heat and mass transfer of ammonia-water in falling film evaporator".Frontiers in Energy 5.4(2011):358. |
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