Overview
ABSTRACT
Heat transferin porous media with phase change is found in many industrial applications. One will distinguish evaporation corresponding typically to drying processes, for which temperature is lower than the saturation temperature, and boiling processes, for which temperature is equal or greater than the saturation temperature. These latter processes are found in many heat exchanger applications, in geothermy, nuclear safety,
... The paper describes models currently usedin the engineering practice.
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Read the articleAUTHORS
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Abdelkader MOJTABI: Professor Paul Sabatier University Toulouse Institute of Fluid Mechanics (IMFT), Toulouse University, CNRS, Toulouse, France
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Marc PRAT: Dr CNRS Institut de mécanique des fluides de Toulouse (IMFT), Université de Toulouse, CNRS, Toulouse, France
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Michel QUINTARD: Dr CNRS Institut de mécanique des fluides de Toulouse (IMFT), Université de Toulouse, CNRS, Toulouse, France
INTRODUCTION
This article, devoted to heat transfer with phase change in porous media, follows on from the article "Heat transfer in porous media. Conduction, convection, radiation"
Phase change phenomena in porous media play an important role in many fields. These include
exploitation of hydrocarbon deposits. Various thermal methods are used (steam injection, in situ combustion, etc.) which lead to phase change mechanisms;
thermal insulation, which can be seriously affected by vapour transfer and condensation;
geothermal energy, transfers between soil and atmosphere ;
multiphase heat exchangers, fuel cells ;
chemical engineering ;
nuclear safety, etc.
Like all multiphase processes, phase change phenomena in porous media are highly complex and, in many respects, our knowledge of them is still only partial. This article looks at the physical processes at work at pore scale and the most common macroscopic models used in drying operations or processes involving boiling.
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KEYWORDS
evaporation | booling process | drying
EDITIONS
Other editions of this article are available:
Heat transfer in porous media
General modeling considerations
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