Simplified Calculation Method of Particle Growth in Flame

Abstract

Production of the particles using hydrolysis reaction or oxidization in a flame is known as one of production processes of nanoparticles. This particle growth process is a complex phenomenon included reaction, fluid motion, particle transportation and particle growth by collision and sintering. To calculate this process, combining particle growth process with transport equation for each particle size and coupling transport equation for each particle size to CFD is general. But this method requires installing user routine to commercial CFD code and the work are not easy. In this work, simplified calculation method based on Lagrangian description was considered in order to calculate the phenomena using commercial CFD code. The method is calculating particle growth in the inspection volume moving along stream lines. This method has to satisfy some conditions such as practically conservation of the mass in the inspection volume. It was confirmed that this method satisfies these conditions for an actual laminar flame. And calculation results by the method consistent with characteristic of particles estimated from the flame property and with the trend of the measured particle diameter. From these results this calculation method can be used for flames which satisfy conditions.