EHD Effects on Periodic Bubble Formation and Coalescence in Ethanol under Non-uniform Electric Field

•The strengthening effect of EHD on the formation of periodic bubbles was confirmed.•Varied electrical Bond numbers (BoE) and Weber numbers (We) was considered to separate the EHD effects.•The bubble dynamic behaviors were compared in the presence and absence of the electric field.•We found that the coalescence bubbling regime exists in high We was restricted by the electric force.•Mechanism of the EHD effects was explained by a qualitative force analysis.