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

网络出版日期: 2023-11-27

基金资助

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).

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

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

摘要

降膜流动由于其丰富动力学特性在传热领域具有重要意义。本文设计了一种新型布膜器,并在此基础上研究了竖管外降膜流动动力学特性。在入口温度为30℃,液膜雷诺数53-4544,热流密度1.33~49.45kW/m2的工况下,对竖管外液膜厚度与液膜流型进行了分析,并拟合了平均液膜厚度与Re之间的关系,实验数据与预测值之间的最大偏差为7.58%。此外,当热流密度增加到某一定值时,液膜厚度发生剧烈变化,随着热流密度进一步增加,实验管表面出现干斑,实验表明,不均匀的温度场会对液膜厚度与液膜流型产生显著影响,最后得到了液膜破断临界热流密度与Re之间的关系。与文献报道的多孔烧结布膜器相比,新型布膜器临界热流密度增加了3.72%-56.95%。

本文引用格式

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

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%.

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