Abstract
The main purpose of this study is to survey numerically comparison of two-phase and single-phase models of heat and mass transfer of Al2O3-water nanofluid liquid film flowing downward a vertical channel. A finite difference method is developed to produce the computational predictions for heat and mass transfer during the evaporation of the liquid film approached by the single-phase and two-phase models. The model solves the coupled governing equations in both nanofluid and gas phases together with the boundary and interfacial conditions. The systems of equations obtained by using an implicit finite difference method are solved by Tridiagonal Matrix Algorithm. The results show that the two-phase model is more realistic since it takes into account the thermophoresis and Brownian effects.
Highlights
The enhancement of heat transfer efficiency has been for decades the mean objective for heat exchangers manufacturer and research laboratories
Yan et al [1] have experimentally analysed the evaporative cooling of a liquid film in a vertical channel with insulated walls
The results show a better cooling of the liquid film when low film flow rate and high inlet temperature were settled
Summary
The enhancement of heat transfer efficiency has been for decades the mean objective for heat exchangers manufacturer and research laboratories. Many active and passive solutions are being proposed In this context, flowing liquid films have the advantage of higher heat transfer coefficient in comparison to single-phase flows. Yan et al [1] have experimentally analysed the evaporative cooling of a liquid film in a vertical channel with insulated walls. The combined buoyancy effects on mass and heat transfer were examined by Feddaoui et al [2]. They reported in their paper the best conditions to foster the heat transfer. Najim et al [5] analysed the effect of salinity on the evaporation and heat exchange of a falling film inside a vertical tube. The authors reported the convenient boundary conditions for a better evaporation in desalination applications
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