Print: | ISSN 0256-1115 |
Online: | ISSN 1975-7220 |
Korean Journal of Chemical Engineering,
Vol.16, No.1, 104-110, 1999 MODELING OF THE MONOMER ROLE AND THE COALESCENCE LIMITATION IN PRIMARY PARTICLE GROWTH
The ''general dynamic'' equation (GDE) has been numerically solved to simulate the growth of ultrafine particles (UFPs) in a tubular aerosol reactor, approximating the particle size distribution by a lognormal function. The GDE includes all the terms describing diffusion, thermophoresis, nucleation, condensation and coagulation. We have also considered the efficiency of liquid-like coagulation to primary particles. The data calculated from our model were compared with those from the previous model and also with some experimental results from a TiO2 UFP generator. The condensation term, which we split from a single coagulation term in the previous model, well described the monomer contribution to the particle growth. Introduction of one adjustable parameter, the efficiency of coagulation, was successful in limiting the growth of primary particles and fit the experimental data.
Keywords:
Ultrafine Particles; Growth; Simulation; General Dynamic Equation; Moment Transformation; Coagulation Efficiency; Condensation
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