Modeling of Generation and Growth of Non-Spherical Particles in Gas Phase

Abstract

Modeling of particle generation and growth in gas phase is important in various fields of science and technology. The size and shape of particles are resulted in both chemical reaction and physical phenomenon including nucleation, coagulation, and sintering. In case where the sintering rate is much higher than coagulation rate, the conventional numerical model for spherical particles is available: the characteristic of spherical particle is expressed by one parameter. Otherwise, at least two parameters are needed to express the morphological characteristics of non-spherical particles. One of the most successful ways is to express the characteristics by surface area and volume of particles. They are available to express the sintering rate and to correct the particle motion and coagulation rate properly. In order to express two-dimensional particle size distribution, a sectional expression was developed, and then it was evolved to two-dimensional discrete-sectional expression. In the former part of this article, the motion of particle and coagulation are descripted briefly. In the latter part, modeling of generation and growth of spherical particle and non-spherical particles by one and two dimensional discretesectional method are descripted.