Etude de l'évaporation en convection mixte d'un film liquide d'un mélange binaire s'écoulant sur un plan incliné soumis à un flux de chaleur constant

Heat and mass transfer in binary film evaporation and condensation in vertical channel

“…In order to fix the position of the liquid-gas interface, we introduce the following transformations [4,7]: In the gaseous phase: Adopting these transformations, the equations governing the flow and heat and mass transfers in the liquid and in the gas phases are [1], [3], [4], [7], [8] follows.…”

“…Where DL is the mass diffusivity of species i in the binary liquid mixture given by [4], [7], [12], [15][16][17].…”

“…Where Dg,im and Dg,am are respectively the mass diffusivity of species i vapor and of dry air given by [7], [14], [17]. Species diffusion equations…”

“…Where Lv is the latent heat of evaporation of binary liquid mixture According to Dalton's law, and by assuming the interface to be at thermodynamic equilibrium, and the air-vapor mixture is an ideal gas mixture, the concentration of species i vapor can be evaluated by [4], [7], [8] (17) Where p*vs,i is the partial pressure of species i at the gas-liquid interface given by [4], [7] :…”

“…This effect is more pronounced for a mixture composed of volatile components. Agunaoun et al [7] numerically investigated the evaporation of a binary liquid film flowing on an inclined plate. They showed that the water evaporation can increase when the inlet liquid composition of ethylene-glycol is less than 40%.…”