Experimental Study on Hydrodynamic Behavior of Falling Film over Vertical Tube  

作　　者：YUE Yunkai ZHANG Zhentao ZHANG Hailun YANG Junling LI Xiaoqiong ZHANG Yu 

机构地区：[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

出　　处：《Journal of Thermal Science》2023年第4期1512-1522,共11页热科学学报（英文版）

基　　金：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).

摘　　要：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℃ for film Re ranged from 53 to 4544 and the heat fluxes ranged from 1.33 to 49.45 kW/m^(2).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%.

关 键 词：falling film film distributor Marangoni effect film thickness 

分 类 号：O35[理学—流体力学]