A308 EFFECT OF ELECTROSTATIC FORCE ON MORPHOLOGY AND GROWTH OF AGGREGATES(Multiphase flow problems)

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Effect of electrostatic force on the aggregation of particles was investigated with Brownian dynamic simulation in the free molecular regime. The aggregation process was simulated with following the Langevin trajectory of each particle. A periodic boundary condition was used, and initially there were 500 primary particles of 16 nmin diameter in each cell. We treated the thermal force and the electrostatic force as the driving forces for the motion of particles. The electrostatic force on the particle in a simulation cell is consisted of an infinite sum of electrostatic pair forces over the remaining particles in the original cell and its replicate cells. The aggregates were described in terms of fractal dimensions. In the simulation, the fractal dimension for the uncharged aggregate was D_f = 1.761, and its value was changed a little for the various amount of charge in bipolar case. But in the unipolar case, the fractal dimension was decreased from 1.641 to 1.537 with increasing of the average number of charges on the particles from 0.2 to 0.3 in initial states. In the bipolar state, the average sizes of aggregates were larger than that of the uncharged case in the early and middle stage of aggregation process, but it was almost same as uncharged case in the final stage. In unipolar state, the average size of aggregates and the dispersion of particle size distribution decreased with increasing of the charge quantities.
一般社団法人日本機械学会の論文
2000-10-01

A308 EFFECT OF ELECTROSTATIC FORCE ON MORPHOLOGY AND GROWTH OF AGGREGATES(Multiphase flow problems)

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