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Fluid Dynamics and Particle Trajectories in a Diffusion Flame Reactor to Synthesize TiO2 Nanoparticles

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Temperature and velocity profiles were simulated by a computational fluid dynamics method for the synthesis of TiO2 nanoparticles by a diffusion flame reactor and also for the collection of the TiO2nanoparticles by a filter. Computational grids were created by GAMBIT and all governing equations for momentum, energy and mass balances were solved by FLUENT code. The effects of O2 flow rate on the fluid dynamics and particle trajectories are illustrated. An increase in O2 flow rate reduces the flame temperature but significantly enhances the gas velocity. The particle trajectory differs according to the starting position. The effect of O2 flow rate on the particle trajectory can be seen clearly at the starting position r0 = 0.2 cm from the central axis. The particles at higher O2 flow rate move closer to the central axis and deposit earlier on the filter than the particles at lower O2 flow rate. The particles starting at r0 = 0.4 cm at higher O2 flow rate move further away from the central axis and deposit at a higher position on the filter. Information on gas temperature, velocity profiles and particle trajectories can be quite useful in designing a diffusion flame reactor to synthesize high-performance TiO2 nanoparticles.


Document Type: Research Article


Publication date: October 1, 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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