Numerical simulation of double-phase coupled heat transfer process of horizontal-tube falling film evaporation

2017 ◽  
Vol 118 ◽  
pp. 33-40 ◽  
Author(s):  
Yihui Zhou ◽  
Zhen Cai ◽  
Zhi Ning ◽  
Mingshu Bi
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Transfer Process ◽  
Horizontal Tube ◽  
Heat Transfer Process ◽  
Falling Film ◽  
Film Evaporation ◽  
Coupled Heat Transfer ◽  
Double Phase ◽  
Falling Film Evaporation

scholarly journals Heat Exchangers for Condensation and Evaporation Applications Operating in a Low Pressure Atmosphere

10.14311/1550 ◽  
2012 ◽  
Vol 52 (3) ◽  
Author(s):  
Petr Kracík ◽  
Jiří Pospíšil ◽  
Ladislav Šnajdárek
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Horizontal Tube ◽  
Heat Transfer Process ◽  
Falling Film ◽  
Evaporation And Condensation ◽  
Film Evaporation ◽  
Condensation Mode ◽  
Falling Film Evaporation ◽  
The Heat Transfer Coefficient

This paper presents a state-of-the-art study of a heat transfer process in liquid spraying heat exchangers placed in a vacuum chamber. The experimental case studied here describes the behavior of a falling film evaporation and condensation mode on horizontal tube bundles. The study aims to obtain the heat transfer coefficient and its correlations by means of a mathematical model.

Numerical Simulation of the Liquid Flowing and Heat-Transfer outside the Tube of the Horizontal-Tube Falling Film Evaporator

2012 ◽  
Vol 614-615 ◽  
pp. 296-300 ◽  
Author(s):  
Wei Kang Hu ◽  
Li Yang ◽  
Lei Hong Guo
Keyword(s):  
Heat Transfer ◽  
Horizontal Tube ◽  
Water Desalination ◽  
Falling Film ◽  
Transfer Enhancement ◽  
Film Evaporation ◽  
Film Evaporator ◽  
Spray Density ◽  
Performance Of Heat Transfer ◽  
Falling Film Evaporation

This paper mainly studies the falling film evaporator in the field of water desalination. Using the method of fluent simulates the process of the liquid flowing and heat-transfer on the horizontal-tube falling film evaporation. The author analyses the distribution of the liquid film, and obtain the rule that spray density, evaporation temperature, temperature difference and pipe diameter affect the performance of heat-transfer in a certain range. So the paper plays a guiding role in heat transfer enhancement in the falling film evaporator.

Microscopic mechanisms of heat transfer in horizontal-tube falling film evaporation

Desalination ◽  
2016 ◽  
Vol 394 ◽  
pp. 64-71 ◽  
Author(s):  
Luopeng Yang ◽  
Yang Liu ◽  
Yan Yang ◽  
Shengqiang Shen
Keyword(s):  
Heat Transfer ◽  
Horizontal Tube ◽  
Falling Film ◽  
Film Evaporation ◽  
Falling Film Evaporation

Experimental Study of Heat Transfer Characteristics for Horizontal-Tube Falling Film Evaporation

2012 ◽  
Author(s):  
Xingsen Mu ◽  
Yong Yang ◽  
Shengqiang Shen ◽  
Gangtao Liang ◽  
Luyuan Gong
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Fresh Water ◽  
Horizontal Tube ◽  
Falling Film ◽  
Heat Transfer Characteristics ◽  
Film Evaporation ◽  
Transfer Characteristics ◽  
Falling Film Evaporation

The horizontal-tube falling film evaporation is a widely adopted technique in multiple-effect distillation (MED) desalination plant due to the higher heat transfer coefficient under quite small temperature differences. In the present study, an experimental platform for horizontal-tube falling film evaporation was set up to measure its heat transfer characteristics. Results indicate that heat transfer coefficient (h) for both fresh water and seawater are almost independent with heat flux. The h increases firstly and then decreases with growth of Re. Along the tube circumference, the h increases after decreasing. In addition, the distribution of h for fresh water and seawater at the different evaporation temperatures and Reynolds number (Re) are also provided.

Numerical simulation of horizontal-tube falling film evaporation using VOF method

2017 ◽  
Vol 61 ◽  
pp. 306-310
Author(s):  
Luopeng Yang ◽  
Yan Yang ◽  
Hongyou Li ◽  
Yang Liu ◽  
Shengqiang Shen
Keyword(s):  
Numerical Simulation ◽  
Horizontal Tube ◽  
Vof Method ◽  
Falling Film ◽  
Film Evaporation ◽  
Falling Film Evaporation

Heat transfer characteristics of horizontal tube falling film evaporation for desalination

2014 ◽  
Vol 55 (12) ◽  
pp. 3343-3349 ◽  
Author(s):  
Shengqiang Shen ◽  
Xue Chen ◽  
Xingsen Mu ◽  
Yaoxuan Wang ◽  
Luyuan Gong
Keyword(s):  
Heat Transfer ◽  
Horizontal Tube ◽  
Falling Film ◽  
Heat Transfer Characteristics ◽  
Film Evaporation ◽  
Transfer Characteristics ◽  
Falling Film Evaporation

Experimental Studies on Heat Transfer Coefficients of Horizontal Tube Falling Film Evaporation With Seawater

2016 ◽  
Vol 139 (1) ◽  
Author(s):  
Shengqiang Shen ◽  
Xue Chen ◽  
Xingsen Mu ◽  
Changkun Jiang
Keyword(s):  
Heat Transfer ◽  
Horizontal Tube ◽  
Falling Film ◽  
Transfer Coefficients ◽  
Average Heat ◽  
Heat Transfer Coefficients ◽  
Film Evaporation ◽  
Evaporation Temperature ◽  
Spray Density ◽  
Falling Film Evaporation

The overall heat transfer process in a horizontal tube falling film evaporator is mainly influenced by the falling film evaporation outside horizontal tube due to the average heat transfer coefficient which is about 50% of that of the condensation inside tube. A series of experimental studies were conducted to investigate the heat transfer coefficients of the falling film evaporation outside the horizontal tube with parameters such as the spray density, the evaporation temperature, the salinity, and the tube spacing. Experiments were conducted by using Al-brass tubes with 19 mm outer diameter and 1600 mm length. The horizontal tubes are arranged vertically in the evaporator. The test tube is heated by an internal electric heater with uniform heat flux. Temperatures of the test tube surface and saturated vapor measured by thermocouples are used to calculate the heat transfer coefficients. The seawater with salinity of 1.5%, 3.0%, and 4.5% was used as experimental fluid. The spray density varied between 0.017 and 0.087 kg/(m s), and the evaporation temperature was controlled in the range of 50–70 °C. Results show that the average heat transfer coefficients of water under different salinities increase obviously with the spray density until a certain point. The average heat transfer coefficients of seawater decrease slightly with the evaporation temperature, decrease with the salinity, increase with the tube spacing, and are almost independent of the heat flux. In addition, the comparisons with 25.4 mm outer diameter tube and the circumferential distribution of local heat transfer coefficient are presented in this study.

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