Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube

Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube

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The problem of laminar film condensation from binary vapours mixture with the presence of non-condensable gas (air) flowing in a vertical tube is numerically investigated. The set of the non-linear parabolic equations expressing the mass conservation, momentum, energy, and species diffusion in both...

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Main Authors: A. Charef, M. Feddaoui, A. Nait Alla, M. Najim
Format: Article
Language:English
Published: Isfahan University of Technology 2019-01-01
Series:Journal of Applied Fluid Mechanics
Subjects:
Condensation; Liquid film thickness; Laminar flow; Phase change; Vertical tube.
Online Access:http://jafmonline.net/JournalArchive/download?file_ID=48512&issue_ID=255
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spelling doaj-04f0f603338149f9a9c7f58b7630d4c82020-11-24T22:04:02ZengIsfahan University of Technology Journal of Applied Fluid Mechanics1735-35722019-01-01122515526.Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical TubeA. Charef0M. Feddaoui1A. Nait Alla2M. Najim3GEMS Laboratry, Ibn Zohr University, ENSA B.P. 1136, Agadir, MoroccoGEMS Laboratry, Ibn Zohr University, ENSA B.P. 1136, Agadir, MoroccoGEMS Laboratry, Ibn Zohr University, ENSA B.P. 1136, Agadir, MoroccoGEMS Laboratry, Ibn Zohr University, ENSA B.P. 1136, Agadir, MoroccoThe problem of laminar film condensation from binary vapours mixture with the presence of non-condensable gas (air) flowing in a vertical tube is numerically investigated. The set of the non-linear parabolic equations expressing the mass conservation, momentum, energy, and species diffusion in both phases with the boundary conditions are resolved by using a finite difference numerical scheme. A comparative study between the results obtained for three cases (water-ethanol-air, water-methanol-air, and ethanol-methanol-air) under the same conditions is made. The impact of varying the wall temperature, the inlet vapour mass fractions, and the inlet liquid mass flow rate on the conjugate the heat and mass transfer during the condensation of the studied mixtures are examined. It is found that the condensation of water-methanol-air corresponds to a higher latent heat flux QL2 and accumulated condensation rate Mr2 when compared with water-ethanol-air and ethanol-methanol-air. Moreover, the nature of the fluid plays an important role in the heat and mass exchanges.http://jafmonline.net/JournalArchive/download?file_ID=48512&issue_ID=255Condensation; Liquid film thickness; Laminar flow; Phase change; Vertical tube.
collection DOAJ
language English
format Article
sources DOAJ
author A. Charef
M. Feddaoui
A. Nait Alla
M. Najim
spellingShingle A. Charef
M. Feddaoui
A. Nait Alla
M. Najim
Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube
Journal of Applied Fluid Mechanics
Condensation; Liquid film thickness; Laminar flow; Phase change; Vertical tube.
author_facet A. Charef
M. Feddaoui
A. Nait Alla
M. Najim
author_sort A. Charef
title Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube
title_short Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube
title_full Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube
title_fullStr Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube
title_full_unstemmed Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube
title_sort combined heat and mass transfer during condensation of vapours mixture and non-condensable gas in a vertical tube
publisher Isfahan University of Technology
series Journal of Applied Fluid Mechanics
issn 1735-3572
publishDate 2019-01-01
description The problem of laminar film condensation from binary vapours mixture with the presence of non-condensable gas (air) flowing in a vertical tube is numerically investigated. The set of the non-linear parabolic equations expressing the mass conservation, momentum, energy, and species diffusion in both phases with the boundary conditions are resolved by using a finite difference numerical scheme. A comparative study between the results obtained for three cases (water-ethanol-air, water-methanol-air, and ethanol-methanol-air) under the same conditions is made. The impact of varying the wall temperature, the inlet vapour mass fractions, and the inlet liquid mass flow rate on the conjugate the heat and mass transfer during the condensation of the studied mixtures are examined. It is found that the condensation of water-methanol-air corresponds to a higher latent heat flux QL2 and accumulated condensation rate Mr2 when compared with water-ethanol-air and ethanol-methanol-air. Moreover, the nature of the fluid plays an important role in the heat and mass exchanges.
topic Condensation; Liquid film thickness; Laminar flow; Phase change; Vertical tube.
url http://jafmonline.net/JournalArchive/download?file_ID=48512&issue_ID=255
work_keys_str_mv AT acharef combinedheatandmasstransferduringcondensationofvapoursmixtureandnoncondensablegasinaverticaltube
AT mfeddaoui combinedheatandmasstransferduringcondensationofvapoursmixtureandnoncondensablegasinaverticaltube
AT anaitalla combinedheatandmasstransferduringcondensationofvapoursmixtureandnoncondensablegasinaverticaltube
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