HEAT AND MASS TRANSFER IN EVAPORATING A TURBULENT LIQUID FILM FALLING ALONG A VERTICAL TUBE

2008 ◽  
Author(s):  
Saliha Senhaji ◽  
M'barek Feddaoui ◽  
Touria Mediouni ◽  
Rachid Mir
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Vertical Tube

scholarly journals Numerical study of heat and mass transfer during evaporation of a turbulent binary liquid film

2015 ◽  
Vol 19 (5) ◽  
pp. 1529-1540
Author(s):  
Larbi Khalal ◽  
M’barek Feddaoui ◽  
Touria Mediouni
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Numerical Study ◽  
Computational Study ◽  
Vertical Tube ◽  
Uniform Heat Flux ◽  
Volatile Components ◽  
Binary Liquid ◽  
Study Results

This paper deals with a computational study for analysing heat and mass exchanges in the evaporation of a turbulent binary liquid film (water-ethanol and water-methanol) along a vertical tube. The film is in co-current with the dry air and the tube wall is subjected to a uniform heat flux. The effect of gas-liquid phase coupling, variable thermophysical properties and film vaporization are considered in the analysis. The numerical method applied solves the coupled governing equations together with the boundary and interfacial conditions. The algebraic systems of equations obtained are solved using the Thomas algorithm. The results concern the effects of the inlet liquid Reynolds number and inlet film composition on the intensity of heat and mass transfer. In this study, results obtained show that heat transferred through the latent mode is more pronounced when the concentration of volatile components is higher in the liquid mixture .The comparisons of wall temperature and accumulated mass evaporation rate with the literature results are in good agreement.

scholarly journals Heat and mass transfer modeling during laminar condensation of non-cryogenic downward fluids flow in a small vertical tube

2020 ◽  
Vol 7 (4) ◽  
pp. 1-19
Author(s):  
Y. Belkassmi ◽  
L. Elmaimouni ◽  
A. Rafiki ◽  
K. Gueraoui ◽  
N. Hassanain
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Vertical Tube ◽  
Film Condensation ◽  
Two Phase ◽  
Cryogenic Fluids ◽  
Mass Transfer Mechanism ◽  
Mass Transfer Modeling ◽  
Good Agreement

The purpose of this paper is to investigate mass and heat transfer in the process of film condensation of vapor-air mixture for non-cryogenic fluids flow in a small vertical tube. A two-phase mathematical model is developed to model the mixture and liquid film. The governing equations for mixture and liquid-film have been resolved using a numerical method. Furthermore, this phenomenon analyzed is linked to a steady-state. Therefore, the development of numerical codes allows us to investigate the effect of implicated parameters on this phenomenon. Ethanol and methanol as non-cryogenic typical working fluids are realized for a good understanding of the heat and mass transfer mechanism during condensation. In this way, several effects of influencing parameters were examined. The predicted results showed a good agreement with experimental data.

Simultaneous heat and mass transfer during evaporation from a film of liquid into the turbulent gas

1982 ◽  
Vol 47 (3) ◽  
pp. 766-775 ◽  
Author(s):  
Václav Kolář ◽  
Jan Červenka
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Driving Forces ◽  
Proper Definition ◽  
Definition Of ◽  
Simultaneous Heat ◽  
Theory And Experiment

The paper presents results obtained by processing a series of published experimental data on heat and mass transfer during evaporation of pure liquids from the free board of a liquid film into the turbulent gas phone. The data has been processed on the basis of the earlier theory of mechanism of heat and mass transfer. In spite of the fact that this process exhibits a strong Stefan's flow, the results indicate that with a proper definition of the driving forces the agreement between theory and experiment is very good.

scholarly journals Modeling of conjugated heat and mass transfer in the entrance region of falling liquid film at various values of the Froude number

2018 ◽  
Vol 194 ◽  
pp. 01007
Author(s):  
Maria V. Bartashevich
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Liquid Film ◽  
Froude Number ◽  
Heat And Mass Transfer ◽  
Water Solution ◽  
Lithium Bromide ◽  
Entrance Region ◽  
Falling Film ◽  
Falling Liquid Film

Mathematical model of conjugated heat and mass transfer in absorption on the entrance region of the semi-infinite liquid film of lithium bromide water solution is investigated for different values of Froude number. The calculations shown that larger values of Froude number corresponds to a smaller thickness of the falling film. It was demonstrated that for large values of the Froude number the heat transfer from the surface is greater than for smaller values.

scholarly journals Heat and mass transfer in a liquid film flowing down the bottom side of inclined surface

2017 ◽  
Vol 110 ◽  
pp. 01087
Author(s):  
Maria V. Bartashevich ◽  
Maxim G. Vlasenko ◽  
Andrey A. Pil’nik ◽  
Andrey A. Chernov
Keyword(s):  
Mass Transfer ◽  
Liquid Film ◽  
Heat And Mass Transfer ◽  
Bottom Side ◽  
Inclined Surface
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