In order to further study the electrohydrodynamic enhancement mechanism of boiling heat transfer,the images of nitrogen injected bubbles and R123 boiling bubbles in a DC electric field were obtained with a high speed camera,and the bubble shape at departure was quantitatively analyzed.Experimental results show that the injected and boiling bubble distinctly elongate along the direction of the electric field.The bubble’s aspect ratio increases with the increase of electric field intensity,and the effect of electric field on the elongation of boiling bubble is more obvious.As the electric field intensity is raised,the departure volumes of injected and boiling bubbles tend to decrease,and the volume of the injected bubble decreases more significantly.