Abstract
In this experimental study, mass transfer and hydrodynamic parameters of water/kerosene/acetic acid system in a packed column were investigated, in which the mass transfer direction was set from the continuous phase (saturated water of kerosene and acetic acid) to the dispersed phase (saturated kerosene of water) in all the experiments. To assess the impact of nanoparticles on mass transfer, the experiments were performed in the presence of SiO2 nanoparticles and absence of the nanoparticles. The results showed that the addition of the nanoparticles to the base fluid (saturated kerosene of water) increased the mass transfer efficiency to the critical concentration, 0.05 vol. %, due to the intensified internal circulation of the droplets. Beyond the critical concentration, the mass transfer efficiency declined by the occurrence of an agglomeration phenomenon, i.e., the change of the mass transfer mechanism from turbulence to diffusion due to the accumulation of the nanoparticles. An empirical correlation for the continuous phase Sherwood number was presented. The mean value of the absolute relative error was calculated to 8.04%, indicating that the proposed correlation represented the experimental data very well. (Less)
Highlights
Nano-fluids have been recently identified as an excellent medium for heat transfer and mass transfer when nanoparticles are well dispersed in the base fluid (Choi et al 1995)
The results showed that the mass transfer coefficient at a concentration of 0.065 wt. % increased by 63% at 200 rpm and an air flow rate of 0.75 mL/min
This is in agreement with the results of many authors (Krishnamurthy et al, 2006, Fang et al, 2009, Gerardi et al, 2009, Veilleux et al, 2010, Ashrafmansouri et al, 2016). Their results show the Brownian motion of nanoparticles and induced micro convection might be responsible for observing mass transfer enhancements at low concentrations of nanoparticles (Krishnamurthy et al, 2006, Veilleux et al, 2010)
Summary
Nano-fluids have been recently identified as an excellent medium for heat transfer and mass transfer when nanoparticles are well dispersed in the base fluid (Choi et al 1995). Ganvir et al (2017) summarize the current research in the nano-fluid studies on convective heat transfer performance, thermo-physical properties, effect of fluid temperature, inlet velocity, use of surfactant for better stability of nano-fluids, particle size, and volume concentration effects. They showed that the characteristics of the heat transfer of current fluids are improved by suspending nano-sized solid particles with less than 100 nm in diameter and are considered as prospective working fluids for the applications such as solar collectors, heat pipes, nuclear reactors, electronic cooling systems, automobile radiators etc
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