Measurement of Falling Film Thickness Around a Horizontal Tube Using a Laser Measurement Technique

2004 ◽  
Vol 25 (8) ◽  
pp. 28-34 ◽  
Author(s):  
D. GSTOEHL ◽  
J. F. ROQUES ◽  
P. CRISINEL ◽  
J. R. THOME
Keyword(s):  
Film Thickness ◽  
Measurement Technique ◽  
Horizontal Tube ◽  
Falling Film ◽  
Laser Measurement

NUMERICAL INVESTIGATION OF FILM DISTRIBUTION IN HORIZONTAL-TUBE FALLING FILM EVAPORATOR

2011 ◽  
Vol 19 (03) ◽  
pp. 177-183 ◽  
Author(s):  
JIN-BO CHEN ◽  
QING-GANG QIU
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Film Thickness ◽  
Liquid Film ◽  
Numerical Investigation ◽  
Horizontal Tube ◽  
Flow Density ◽  
Falling Film ◽  
Film Distribution ◽  
Simulation Results

The technique of horizontal-tube falling film has been used in the cooling and heating industries such as refrigeration systems, heating systems and ocean thermal energy conversion systems. The comprehensive performance of evaporator is directly affected by the film distribution characteristics outside tubes. In this paper, numerical investigation was performed to predict the film characteristics outside the tubes in horizontal-tube falling film evaporator. The effects of liquid flow rate, tube diameter and the circular degree of tube on the film thickness were presented. The numerical simulation results were compared with that of the empirical equations for calculating the falling film thickness, and agreements between them were reasonable. Numerical simulation results show that, at the fixed fluid flow density, the liquid film is thicker on the upper and lower tube and the thinnest liquid film appears at angle of about 120°. The results also indicate that, when the fluid flow density decreases to a certain value, the local dryout spot on the surface of the tube would occur. In addition, the film thickness decreases with the increases of the tube diameter at the fixed fluid flow density.

Distribution characteristics of falling film thickness around a horizontal tube

Desalination ◽  
2012 ◽  
Vol 285 ◽  
pp. 393-398 ◽  
Author(s):  
Hao Hou ◽  
Qincheng Bi ◽  
Hong Ma ◽  
Gang Wu
Keyword(s):  
Film Thickness ◽  
Horizontal Tube ◽  
Falling Film ◽  
Distribution Characteristics

Three-dimensional film thickness distribution of horizontal tube falling film with column flow

2019 ◽  
Vol 154 ◽  
pp. 140-149 ◽  
Author(s):  
Jie Wang ◽  
Xue Chen ◽  
Tao Lu ◽  
Xueshuo Chen ◽  
Shengqiang Shen ◽  
...  
Keyword(s):  
Film Thickness ◽  
Thickness Distribution ◽  
Three Dimensional ◽  
Horizontal Tube ◽  
Falling Film
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