Experimental Study on Hydrodynamic Behavior of Falling Film over Vertical Tube

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  • 1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China 
    3. Key Laboratory of Technology on Space Energy Conversion, Technical Institute of Physics and Chemistry, Chinese Academy of Science, Beijing 100190, China

Online published: 2023-11-27

Supported by

This work was supported by National Key Research and Development Program of China (No. 2020YFF0303902), the National Natural Science Foundation of China (No. 51876216 and No. 21978308), Special Fund for Central Guiding Local Science and Technology Development (ZYYD2022B11, 2022ZY0048).

Copyright

Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2023

Abstract

Falling film configurations play an important role in characterizing the heat transfer due to changes in hydrodynamic behavior. The purpose of this study is to establish a novel film distributor to investigate the hydrodynamic behavior of the falling film on the vertical tube. The falling film thickness and flow patterns on the vertical tube were analyzed at a feed water temperature of 30°C for film Re ranged from 53 to 4544 and the heat fluxes ranged from 1.33 to 49.45 kW/m2. The correlation between the average falling film thickness and the film Re was fitted; the maximum deviation between the experimental data and the predicted values was 7.58%. Additionally, the film thickness changed sharply when the heat flux increased to a certain value. With the further increase of the heat flux, dry patches appeared on the surface of the experimental tube. There was Marangoni effect on vertical tube and the falling film thickness and flow patterns were significantly affected by heating. The interval value of the critical heat flux with film Re was obtained. Compared with the porous film distributor reported in the literature, the critical heat flux of the new film distributor increased by 3.72%–56.95%.

Cite this article

YUE Yunkai, ZHANG Zhentao, ZHANG Hailun, YANG Junling, LI Xiaoqiong, ZHANG Yu . Experimental Study on Hydrodynamic Behavior of Falling Film over Vertical Tube[J]. Journal of Thermal Science, 2023 , 32(4) : 1512 -1522 . DOI: 10.1007/s11630-023-1732-z

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