Direct simulation Monte Carlo method for particle coagulation and aggregation

A Monte Carol simulation technique developed describes dispersed-phase syst ems with emphasis on coagulation and aggregation. The method does not use p article trajectories, but is based on the transformation of known collision frequencies into collision probabilities of particle pairs. The particle e volution was computed as a stochastic game, computing the time step after e ach collision. The simulations were validated by comparing with exact mathe matical solutions for aggregation of solid particles and with numerical sol utions based on sectional methods for coagulation of droplets. The direct s imulation Monte Carlo (DSMC) method is advantageous, because the simulation of complex, multidimensional systems results in very elaborate models when using sectional models and is implemented very easily. Two examples of ind ustrial importance are chemical reaction in coagulating droplets and coatin g of particles with small solid particles.