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Comparative Study of Reversal Flow during the Evaporation or Condensation of Water and Ethanol Film in a Vertical Channel

Publish Year: 1397
Type: Journal paper
Language: English
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Document National Code:

JR_JAFM-11-5_026

Index date: 8 January 2022

Comparative Study of Reversal Flow during the Evaporation or Condensation of Water and Ethanol Film in a Vertical Channel abstract

A comparative study of reversal flow is carried out to investigate the effect of thermal and mass buoyancy forces with evaporation or condensation along a vertical channel. The highlight is focused on the effects of phase change of two different liquid films having widely different properties, on heat and mass transfer rates in the channel. The evaporation occurs along isothermal and wetted walls. The induced laminar upward flow consists of a mixture of blowing air and vapour of water or ethanol. Various combinations of thermal and solutal boundary conditions (cooling and heating modes) are considered to investigate extensively their influence on the flow development. A two-dimensional steady state and elliptical flow model is used and the liquid film is assumed extremely thin. The governing equations of the model are solved by FVM and the velocity-pressure fields are treated with the SIMPLER algorithm. The results show that the buoyancy forces have a significant effect on the hydrodynamic, thermal and mass fields of both gas mixtures. In addition, the flow reversal is predicted with a relatively high temperature difference between the air-mixture and the wetted walls.

Comparative Study of Reversal Flow during the Evaporation or Condensation of Water and Ethanol Film in a Vertical Channel Keywords:

Comparative Study of Reversal Flow during the Evaporation or Condensation of Water and Ethanol Film in a Vertical Channel authors

K. Sellami

Transfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. ۳۲ El Alia, ۱۶۱۱۱ Bab Ezzouar, Algiers Algeria

N. Labsi

Transfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. ۳۲ El Alia, ۱۶۱۱۱ Bab Ezzouar, Algiers Algeria

M. Feddaoui

GEMS Laboratry, Ibn Zohr University, ENSA B.P. ۱۱۳۶, Agadir, Morocco

M. Oubella

Laboratory of Energy, Materials and Systems Engineering, National School of Applied Sciences of Agadir, University of Ibn Zohr, Morocco

Y. K. Benkahla

Transfer Phenomena Laboratory, RSNE Team, FMGP, University of Science and Technology Houari Boumediene, BP. ۳۲ El Alia, ۱۶۱۱۱ Bab Ezzouar, Algiers Algeria

M. Najim

Laboratory of Energy, Materials and Systems Engineering, National School of Applied Sciences of Agadir, University of Ibn Zohr, Morocco