Numerical Simulation of Three-Dimensional Particle Migration and Electrohydrodynamics of Double Cylinder Electrostatic Precipitator
H. Kawakami1, A. Zukeran2, K. Yasumoto1, T. Inui1, Y. Enami1, Y. Ehara3, T. Yamamoto3
1Fuji Electric Co., Ltd., Japan
2Department of Electronic and Electrical Engineering, Kanagawa Institute of Technology, Japan
3Department of Electrical and Electronic Engineering, Tokyo City University, Japan
Abstract— The double cylinder type electrostatic precipitator (DCESP) was developed to collect the entrained diesel particles. In this study, the three-dimensional particle motion in the DCESP was investigated which included the flow interaction between the primary flow and the secondary flow (or ionic wind), i.e., electrohydrodynamics. It was a coaxial double-cylindrical structure consisting of the outermost grounding case, the inner ground electrode punched with multiple holes, and the high voltage center electrode. The fundamental equations for solving the space-charge and electric field distributions are Poison’s equation and the current-continuity equation, which are the driving-external-force for the electrohydrodynamics. The governing equations for solving the electrohydrodynamic flow fields are Navier-Stokes equation and the mass conservation equation. Three-dimensional flow interaction and particle trajectory are calculated using the commercially available STAR-CD. As a result, the maximum ionic wind velocity became 6.5 m/s. The flow interaction was induced towards the hole-punched inner grounded electrode from the high voltage center electrode and returned to the center electrode between star shaped electrodes. The particle trajectory was also calculated. The number of collected particles on the hole-punched grounded electrode was increased owing to the effect of the ionic wind.
Keywords— electrostatic precipitator, numerical simulation, electrohydrodynamics, particle migration, collection efficiency