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Titre du document / Document title

Numerical study of boundary layer transition in flowing film evaporation on horizontal elliptical cylinder

Auteur(s) / Author(s)

ASBIK M. (1) ; ANSARI O. (1) ; ZEGHMATI B. (2) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Faculté des Sciences et Techniques, UFR de Modélisation en Exploitation Rationnelle des Ressources Naturelles, B. P. 509, Boutalamine, Errachidia, MAROC
(2) Centre d'Etudes Fondamentales (G.M.A.I.-C.E.F.), EA 2986 Université de Perpignan, 52, avenue de Villeneuve, 66860 Perpignan, FRANCE

Résumé / Abstract

A numerical study of the onset of longitudinal transition between turbulent and laminar regimes during the evaporation of a water film is presented. These water film streams along a horizontal elliptical tube under the simultaneous effects of gravity, pressure gradients, caused by the vapor flow and curvature, and viscous forces. At the interface of water vapor, the shear stress is supposed to be negligible. Outside the boundary layer, the vapor phase velocity is obtained from potential flow. In the analysis Von Karman's turbulence model is used and the inertia and convection terms are retained. Transfers equations are discretised by using the implicit Keller method. The effects of an initial liquid flow rate per unit of length, Froude number, temperature difference between the wall and the liquid-vapor interface and ellipticity on the transition position have been evaluated. The transition criterion has been given in term of the critical film Reynolds number (ReΓ)C

Revue / Journal Title

Heat and mass transfer    ISSN  0947-7411 

Source / Source

2005, vol. 41, no5, pp. 399-410 [12 page(s) (article)] (35 ref.)

Langue / Language

Anglais
Revue : Allemand

Editeur / Publisher

Springer, Heidelberg, ALLEMAGNE  (1995) (Revue)

Mots-clés anglais / English Keywords

Film evaporator

;

Digital simulation

;

Heat transfer

;

Forced convection

;

Liquid vapor interface

;

Horizontal cylinder

;

Elliptical cylinder

;

Film flow

;

Evaporation

;

Boundary layers

;

Transition flow

;

Turbulent laminar transition

;

Mots-clés français / French Keywords

Evaporateur film

;

Simulation numérique

;

Transfert chaleur

;

Convection forcée

;

Interface liquide vapeur

;

Cylindre horizontal

;

Cylindre elliptique

;

Ecoulement pelliculaire

;

Evaporation

;

Couche limite

;

Ecoulement transition

;

Transition laminaire turbulente

;

Mots-clés espagnols / Spanish Keywords

Evaporador película

;

Interfase líquido vapor

;

Cilindro horizontal

;

Cilindro elíptico

;

Localisation / Location

INIST-CNRS, Cote INIST : 7130, 35400012621794.0020

Nº notice refdoc (ud4) : 16541989



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