Electrohydrodynamic flow patterns in a wide spacing spike-plate electrostatic precipitators under negative coronas

Abstract

This chapter presents an electrohydrodynamic (EHD) flow patterns in a wide-spacing spike-plate electrostatic precipitation (ESP) under negative corona, which are categorized based on the 3D-particle image-velocimetry method. For negative corona, irregular locations of discharge tufts on the surface of the wire introduce quasi-steady EHD flows that contribute to the redistribution of pre-existing turbulence and oppose to the formation of large-scale secondary flow. The formation of EHD flow patterns as well as their effect on the transport of submicron and micron dust particles is discussed based on the dimensionless analysis of particle-transport equation. Based on the experimental results, five EHD flow patterns are characterized and correlated to the ratio between EHD number and Reynolds number squared.