Influence of Nano TiO2 on Falling Film Absorption of Ternary NH3-H2O-LiBr Working Fluid
In order to investigate the impact of nano TiO2 on the falling film absorption of the ternary NH3-H2O-LiBr working fluid,the numerical analysis to establish a set of continuous equations governing mass,energy,and component mass balance in the falling film absorption process of the ternary working fluid is employed in this paper.Programming and computational simulations of the absorption performance of the nano fluid are conducted using Matlab software.The results are compared and validated against experimental data.Furthermore,a comprehensive analysis is undertaken to examine the influence of nano TiO2 mass fraction,initial ammonia concentration,initial temperature,cooling water inlet temperature,absorption pressure,and falling film tube length on the absorption performance.The findings indicate that the addition of nano TiO2 enhances the mass transfer rate in falling film absorption,primarily attributed to the increased diffusion coefficient of ammonia within the liquid film.The diffusion coefficient exhibits a significant increase of 3.44 times,6.42 times,and 11.76 times as the nano TiO2 mass fraction increases from 0%to 0.1%,0.3%,and 0.5%,respectively.Moreover,elevating the initial ammonia concentration,reducing the initial temperature,increasing the cooling water inlet temperature,or decreasing the absorption pressure positively impacts the saturation level of the final solution.
Falling filmAbsorptionTiO2 nanoparticlesNH3-H2O-LiBrSimulation study
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