Condensation of water vapor in a vertical channel by mixed convection of humid air in the presence of a liquid film flowing down

Desalination ◽  
2007 ◽  
Vol 204 (1-3) ◽  
pp. 471-481 ◽  
Author(s):  
A. Belhadj Mohamed ◽  
J. Orfi ◽  
C. Debissi ◽  
S. Ben Nasrallah
Keyword(s):  
Water Vapor ◽  
Mixed Convection ◽  
Liquid Film ◽  
Vertical Channel ◽  
Humid Air

Heat and mass transfer in binary film evaporation and condensation in vertical channel

2015 ◽  
Vol 4 (1) ◽  
pp. 214
Author(s):  
Abdelaziz Nasr ◽  
Abdulmajeed S. Al-Ghamdi
Keyword(s):  
Mass Transfer ◽  
Ethylene Glycol ◽  
Mixed Convection ◽  
Liquid Film ◽  
Vertical Channel ◽  
Vapor Concentration ◽  
Evaporation And Condensation ◽  
Film Evaporation ◽  
Binary Liquid ◽  
Water Condensation

Evaporation and condensation in the presence of binary liquid film flowing on one of two parallel vertical plates by mixed convection have been studied numerically. The first plate is adiabatic and wetted by a binary liquid film while the second one is dry and isothermal. The results concern the effects of the inlet parameters on the ethylene glycol evaporation and on the water condensation. Results obtained show that the increase of the inlet vapor concentration of water benefits its condensation and the increase of the inlet vapor concentration of ethylene glycol inhibits its evaporation.

scholarly journals Volume of Fluid (VOF) Modeling of Liquid Film Evaporation in Mixed Convection Flow through a Vertical Channel

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hayat El Baamrani ◽  
Lahcen Bammou ◽  
Ahmed Aharoune ◽  
Abdallah Boukhris
Keyword(s):  
Mass Transfer ◽  
Heat Flux ◽  
Mixed Convection ◽  
Liquid Film ◽  
Flux Density ◽  
Mass Flow Rate ◽  
Flow Rate ◽  
Heat Flux Density ◽  
Vertical Channel ◽  
Film Evaporation

In this paper, the volume of fluid (VOF) method in the OpenFOAM open-source computational fluid dynamics (CFD) package is used to investigate the coupled heat and mass transfer by mixed convection during the evaporation of water-thin film. The liquid film is falling down on the left wall of a vertical channel and is subjected to a uniform heat flux density, whereas the right wall is assumed to be insulated and dry. The gas mixture consists of air and water vapor. The governing equations in the liquid and in the gas areas with the boundary conditions are solved by using the finite volume method. The results which include temperature, velocity, and vapor mass fraction are presented. The effect of heat flux density, liquid inlet temperature, and mass flow rate on the heat and mass transfer are also analyzed. Better liquid film evaporation is noted for the system with a higher heat flux density and inlet liquid temperature or a lower mass flow rate. Therefore, the VOF method describes well the thermal and dynamic behavior during the evaporation of the liquid film.

scholarly journals Numerical Investigation of Influence of Nanoparticles Presence on Water Vapor Condensation Process inside a Vertical Channel

2021 ◽  
Vol 2021 ◽  
pp. 1-20
Author(s):  
Mustapha Ait Hssain ◽  
Sara Armou ◽  
Kaoutar Zine-Dine ◽  
Rachid Mir ◽  
Youness El Hammami
Keyword(s):  
Water Vapor ◽  
Volume Fraction ◽  
Vertical Channel ◽  
Vapor Condensation ◽  
Film Condensation ◽  
Condensation Process ◽  
Cu Nanoparticles ◽  
Humid Air ◽  
Noncondensable Gas ◽  
Maximum Improvement

This paper is aimed at investigating the nanofluid film condensation by mixed convection in the presence of water vapor, Cu nanoparticles, and air treated as a noncondensable gas (NCG) on the inner walls of a vertical channel. In this simulation, the flow is laminar, stationary, two dimensional, and axisymmetric. The coupled governing equations for the liquid film with the nanoparticles and the mixture air-humid-nanoparticles are solved together using the finite volume method. Since the application of humid air condensation is one of the most applicable methods of phase change processes that is observed in different industrial fields such as heating, ventilation, and air conditioning (HVAC) or cooling systems, for this purpose, the influence of injecting a uniform volume fraction of nanoparticles on improving heat and mass transfer is determined as a function of the variation in relative humidity, velocity, temperature, pressure, and volume fraction of Cu nanoparticles at the channel inlet. The numerical results indicate that under the best conditions in the range of variation studied RH in = 100 % , Re in = 2000 , T in = 50 ° C , P in = 0.5     atm , and φ in = 0.1 % , the use of nanoparticles has a greater impact, and the maximum improvement in the condensation film thickness, the local Nusselt number, and the accumulated condensation rate has an effective ratio strictly greater than one compared with the case of pure humid air.

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