期刊
APPLIED THERMAL ENGINEERING
卷 148, 期 -, 页码 412-419出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2018.11.043
关键词
Computational fluid dynamics (CFD); Film thickness; Heat transfer coefficient; Falling film evaporation
资金
- National Natural Science Foundation of China [51641608]
Horizontal tube falling film evaporators are widely used in refrigeration and chemical industry. Two-dimensional numerical model with different tube shapes is established in this paper to simulate heat and mass transfer process with CFD method, and the heat transfer coefficient of simulation is also validated by experimental data. Flow and heat transfer characteristics of falling film evaporation on a circular tube and three flat tubes are investigated, respectively. It is confirmed that the liquid film becomes thinner and thinner as height-width ratio increases and average film thickness of three flat tubes is nearly 2.9-16.5% smaller than that of circular tube 1. Additionally, the cross sections of flat tube have a lower dimensionless temperature and a thinner thermal boundary layer, which means a better heat transfer performance compared with the circular tube 1. The average heat transfer coefficient of three flat tubes is approximately 2.2%, 4.2% and 11.2% higher than that of the circular tube, respectively.
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