Keywords: EHD, ESP, Chen-Kim model, turbulent modelling, Von-Karman vortex, electrohydrodynamic gas flow, electrostatic precipitators, computational fluid dynamics, CFD, flow velocity
CFD modelling of electrohydrodynamic gas flow in an electrostatic precipitator
Modelling of the flow velocity fields for electrohydrodynamic flow in a wire-to-plate type electrostatic precipitator was achieved. From calculations for the flow employing different flow models, the Chen-Kim k − ε turbulent model appeared to be the most appropriate choice to obtain a quantitative image of the resulting mean flow field and downstream wake flow of the rear wire, although this was obtained from a qualitative analysis owing to the lack of experimental verification. The flow velocity field pattern showed a strong electrohydrodynamic secondary flow, which was clearly visible in the downstream regions of the corona wire despite the low Reynolds number for the electrode (ReCW = 12.4). Secondary flow vortices were also caused by the electrohydrodynamic with increases in the discharge current. Pressure drop increased gradually according to the increase of the electrohydrodynamic number.