MONTE-CARLO SIMULATION OF TURBULENT DEPOSITION OF CHARGED-PARTICLES IN A PLATE-PLATE ELECTROSTATIC PRECIPITATOR

The characteristics of turbulent deposition of charged particles in a plate-plate electrostatic precipitator (ESP) are analyzed by the Lagra ngian simulation method which uses the concept of time series analysis for the particle motion in a turbulent flow field. With the advantage of the Lagrangian method, several important parameters are taken into account such as the effect of nonuniform diffusivity on the particle motion and the effects of particle inertia including the crossing traj ectory effect, boundary layer trapping and the lift force near the wal l. Collection efficiencies are obtained without any simplified treatme nt for a wide range of Peclet number (Pe) of interest, where it is fo und that the collection efficiency is mainly the function of Pe and D eutsch number, and the dependency on particle relaxation time is negli gible in the range about Pe > 0.1. Moreover, the characteristics of d eposition at the intermediate Pe is analyzed clearly, where both the diffusion and migration by external force play an important role on th e deposition.