Numerical study of heat and mass transfer in a desalination system

H El Baamrani,A Boukhris,L Bammou,A Aharoune,S Krit

doi:10.1051/e3sconf/202122901018

Abstract

In today’s world the demand for freshwater, to meet the needs of human activities is growing exponentially. As a result, manufacturers are continuing to make progress in the design and production of efficient desalination and cooling units to optimize and reduce the overall cost of production. In this work, we study the numerical study of the evaporation of a thin liquid film dripping by gravity with constant feed rates in a closed rectangular cavity formed by two parallel flat plates. The wall which supports the liquid film is heated by a constant temperature heating, while the other is kept at a constant and uniform temperature to condense the formed vapor. The results obtained show that the heat transfer in the distillation cell is dominated by the latent heat transfer associated with the evaporation. The results also show that the temperature of the film increases slightly for the heating zone and then decreases over most of the plate for the evaporation zone

Highlights

Due to its wide practical applications, the evaporation of a liquid film has been the subject of several works, both numerical and experimental [1,2,3,4,5,6,7,8,9,10]
To simulate the heat and mass transfers with evaporation / condensation of a liquid film, several authors have adopted the hypothesis of a liquid film of negligible thickness [1, 3,4]
The film is treated as a boundary condition. The validity of this hypothesis has been investigated by Yan [8,9]. This author has carried out a numerical study of laminar mixed convection with evaporation of a liquid film dripping on the internal walls of a vertical canal

Summary

Introduction

Due to its wide practical applications (desalination, evaporative cooling, cooling of electronic components, ...), the evaporation of a liquid film has been the subject of several works, both numerical and experimental [1,2,3,4,5,6,7,8,9,10] This work concerned both mixed and natural convection flows. The validity of this hypothesis has been investigated by Yan [8,9] This author has carried out a numerical study of laminar mixed convection with evaporation of a liquid film dripping on the internal walls of a vertical canal. The walls of the channel are uniformly heated isothermally [9] or with a uniform heat flow [8]

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