Asymmetric distribution of falling film solution flowing on hydrophilic horizontal round tube

被引：61
作者：
Ji, Ge [1 ]
Wu, Jiafeng [1 ]
Chen, Yaping [1 ]
Ji, Guangju [1 ]
机构：
[1] Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID | 2017年 / 78卷
基金：
中国国家自然科学基金;
关键词：
Tube surface wettability; Solution spreading; Horizontal round tube; Film thickness; MASS-TRANSFER; KALINA CYCLE; HEAT; ABSORPTION; EVAPORATION; PERFORMANCE; THICKNESS; SYSTEM; ABSORBER; BUNDLES;
D O I：
10.1016/j.ijrefrig.2017.03.022
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A two-dimension two phase flow model was established to simulate the falling film flow of LiBr solution on a horizontal hydrophilic tube with different solution sprinkle density and tube surface wettability, and the latter has been an overlook factor. The transient characteristics of solution spreading as well as steady film thickness were analyzed. The results show that a continuous film can only be obtained at sufficiently greater sprinkle density with real surface wettability, the liquid coverage of tube surface increases with the increase of sprinkle density or the decrease of static contact angle. The obvious asymmetric distributions of film thickness and film velocity over the horizontal tube surface are demonstrated in a steady state. The thinnest film thickness or maximum film velocity takes place at circumferential angle around 120 degrees. A modified Nusselt equation for predicting the film thickness is suggested and verified by available both simulation and experimental data. (C) 2017 Elsevier Ltd and IIR. All rights reserved.
引用
收藏
页码：83 / 92
页数：10
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