Numerical study of evaporation in a vertical annulus heated at the inner wall
Identifieur interne : 000937 ( PascalFrancis/Curation ); précédent : 000936; suivant : 000938Numerical study of evaporation in a vertical annulus heated at the inner wall
Auteurs : R. Ben Radhia [Tunisie] ; J. P. Corriou [France] ; S. Harmand [France] ; S. Ben Jabrallah [Tunisie]Source :
- International journal of thermal sciences [ 1290-0729 ] ; 2011.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Eau.
English descriptors
- KwdEn :
Abstract
Mixed convection during evaporation of a water falling film in a vertical concentric annulus was studied numerically. The water thin film falls on the inner tube and is subjected to a constant heat flux density, whereas the outer cylinder is assumed to be insulated and dry. An imposed air flow circulates within the gap between the two concentric tubes. The objective of this work is to understand the evaporation phenomenon in order to improve the average evaporated mass flux density and heat and mass transfer. Conservative equations governing the gas phase are solved numerically using the finite volume method. In the liquid phase, a method based on local heat and mass balances on each level is used. Thus, the following liquid film parameters, feed water mass flow, feed temperature and heat flux density, are taken into account. The obtained results are analyzed to emphasize and evaluate the influence of the previous operating parameters and the annulus curvature on the effective evaporation surface and on the mass flux density of evaporated water.
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<front><div type="abstract" xml:lang="en">Mixed convection during evaporation of a water falling film in a vertical concentric annulus was studied numerically. The water thin film falls on the inner tube and is subjected to a constant heat flux density, whereas the outer cylinder is assumed to be insulated and dry. An imposed air flow circulates within the gap between the two concentric tubes. The objective of this work is to understand the evaporation phenomenon in order to improve the average evaporated mass flux density and heat and mass transfer. Conservative equations governing the gas phase are solved numerically using the finite volume method. In the liquid phase, a method based on local heat and mass balances on each level is used. Thus, the following liquid film parameters, feed water mass flow, feed temperature and heat flux density, are taken into account. The obtained results are analyzed to emphasize and evaluate the influence of the previous operating parameters and the annulus curvature on the effective evaporation surface and on the mass flux density of evaporated water.</div>
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