Heat and Mass Transfer Enhancement in Absorption of Vapor in Laminar Liquid Film by Adding Nano-Particles

Abstract

In this paper, a numerical study was performed. The effect of nanoparticles on the absorption of vapor into a liquid film of lithium bromide aqueous solution flowing down over a cooled vertical channel is examined. The present model uses the numerical finite volume method to solve the parabolic governing equations for twodimensional and laminar flow. In this model, the cooling water flows countercurrent to a solution of concentrated lithium bromide mixed with the nanoparticles. The water vapor is then absorbed at the interface of the absorbent film and diffused into the binary nanofluid (water-LiBr+nanoparticles). The numerical results indicate that the mass and heat transfer in binary nanofluids are enhanced more than that in base fluid and the highest absorption mass flux is observed by adding argent (Ag) nanoparticles. The results of the effects of operating conditions show that the effectiveness of the nanofluid becomes higher than that with the base fluid when the Reynolds number and inlet concentration are lower and when the inlet temperature solution and inlet pressure are higher.

Combined Heat and Mass Transfer during Condensation of Vapours Mixture and Non-Condensable Gas in a Vertical Tube

“…The liquid-mixture interface is in thermodynamic equilibrium. The axial diffusion of heat, mass and momentum are negligible (Feddaoui et al (2001)); that the heat transfer by the radiation, Soret and Dufour effects are negligible (Armou et al (2017)). Finally, the gas and the liquid phases have the same pressure.…”

Effect of adding copper oxide nanoparticles on the mass/heat transfer in falling film absorption

“…Some scholars have discussed the influence of nanoparticles on the performance of the absorber by numerical simulation. Armou et al [11] established a CFD model for falling film absorption of nanofluids in laminar flow based on the assumption that the wall temperature changes linearly. The numerical results revealed that nanofluids have higher mass transfer capacity.…”