A study of the downward flow of a liquid film along a vertical surface with attendant heat transfer

1971 ◽  
Vol 20 (4) ◽  
pp. 486-491 ◽  
Author(s):  
B. G. Ganchev ◽  
V. M. Kozlov ◽  
V. V. Lozovetskii
Keyword(s):  
Heat Transfer ◽  
Liquid Film ◽  
Vertical Surface ◽  
Downward Flow

Theoretical and Experimental Analysis of Turbulent Liquid Film Flowing down a Vertical Surface

2009 ◽  
Vol 15 ◽  
pp. 3-8
Author(s):  
Stasys Sinkunas ◽  
Jonas Gylys ◽  
Algimantas Kiela
Keyword(s):  
Heat Transfer ◽  
Liquid Film ◽  
Analytical Study ◽  
Film Flow ◽  
Convex Surface ◽  
Local Heat Transfer ◽  
Local Heat ◽  
Vertical Surface ◽  
Momentum And Heat Transfer ◽  
Liquid Film Flow

The purpose of the present study is to obtain a comprehension for the momentum and heat transfer developments in gravitational liquid film flow. Analytical study of stabilized heat transfer for turbulent film was performed. A calculation method of the local heat transfer coefficient for a turbulent film falling down a vertical convex surface was proposed. The dependence of heat flux variation upon the distance from the wetted surface has been established analytically. Experimental study of velocity profiles for turbulent liquid film flow in the entrance region is performed as well. Analysis of profiles allowed estimating the length of stabilization for turbulent film flow under different initial velocities.

Cooling of a Very Hot Vertical Surface by a Falling Liquid Film

1974 ◽  
Vol 96 (2) ◽  
pp. 126-131 ◽  
Author(s):  
K. H. Sun ◽  
G. E. Dix ◽  
C. L. Tien
Keyword(s):  
Heat Transfer ◽  
Liquid Film ◽  
Vertical Surface ◽  
Temperature Profiles ◽  
Continuous Film ◽  
Falling Liquid Film ◽  
Biot Numbers ◽  
Transfer Mechanisms ◽  
Two Temperature ◽  
Good Agreement

The present study analyzes the cooling of a very hot vertical surface by a falling liquid film. An analytical model is developed to characterize this phenomenon in three distinctive regions: a dry region ahead of the wet front, a sputtering region immediately behind the wet front, and a continuous film region further upstream. The analysis leads to predictions of the wet front velocity, the sputtering length, and the temperature profiles with respect to the wet front. The heat transfer mechanisms are shown to be dependent upon two temperature parameters characterizing the initial wall temperature and the temperature range for sputtering, and two Biot numbers comparing the convective heat transfer in the liquid film region and the sputtering region with longitudinal heat conduction. The predictions are in good agreement with existing experimental results.

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