Electrohydrodynamic Gas Flow Regime Map in a Wire-Plate Type Electrostatic Precipitator

J. S. Chang and K. Urashima

Department of Engineering Physics, McMaster University, Canada

Abstract

It is well known that Electrohydrodynamically (EHD) induced secondary flow, i.e. so called ionic wind; normally reduce a particle collection efficiency of electrostatic precipitators (ESPs). However, the origin of this EHD secondary flow may now proposed to be initiated from the corona wire and grounded plate electrode separated. The flow pattern generated by EHD secondary form is more complex but categorized recently to 5 patterns as follows; 1. EHD wake flow; 2. EHD induced von Karman vortex stream; 3. Forward EHD wake; 4.Full EHD vortex downstream; and 5. Full Channel EHD vortex regimes. In this work, new combined parameter Ehd/Re² was introduced to simplified flow regime maps based on two parameters (Ehd/Re²)_cw based on corona wire and (Ehd/Re²)_ch based on flow channel, and EHD flow regime map was developed for the negative voltage ESP operations. The results show that the parameter Ehd/Re² is effective to predict EHD flow regime for various size and design of ESPs.s

Keywords - Electrostatic Precipitator, EHD Flow, Dust Particle Collection, Flow Regime Map

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