Computational analysis on fluid dynamics during the flame synthesis of TiO2 nanoparticles

초록

A computational method was used to simulate the gas temperature, velocity and species composition profiles in the diffusion flame reactor during the CH4 combustion, the titanium-tetra-isopropoxide (TTIP) decomposition to form TiO2 and the filtration of TiO2 particles. The effects of various O-2 and CH4 flow rates on the gas temperature and velocity are illustrated. An increase in the O-2 flow rate reduces slightly the flame temperature but enhances significantly the gas velocity and the heat convection rate. An increase in the CH4 flow rate leads to an increased flame temperature and gas velocity. The deposition rate of TiO2 particles on the filter was calculated along the height of the filter for various O-2 and CH4 flow rates. An increase in the O-2 flow rate can enhance the deposition rate of TiO2 particles clearly, while an increase in CH4 flow rate decreases the deposition rate of TiO2 particles on the filter slightly. The deposition rate increases as higher positions of the filter.

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