Transition of the electrohydrodynamic two-phase flow into the single-phase flow in a needle-to-plate negative corona discharge in the finite-volume chamber

This work presents the instantaneous flow images and velocity vector field maps showing the temporal and spatial evolution of the electrohydrodynamic two-phase flow to the single-phase flow after the negative corona inception between the needle-to-plate electrode. The results showed that the EHD flow evolvement of the two-phase fluid can be divided into four transient two-phase structural stages, i.e. the free jet stage, the initial stage of wall-impinging jet, the development stage of wall-impinging jet and the fully developed EHD jet. The flow evolution ends with the single-phase steady-state due to the electrostatic precipitation of the incense smoke particulates.