Abstract: An immersion top blowing experimental device was designed to trace the movement of bubbles in water, hydraulic oil and glycerin. The bubble deformation, motion characteristics of the bubbles and the rising height of the liquid surface were studied under different gas flow rates (0.5，1.0，1.5，2.0 m³/h) and nozzle immersion depths (130，200，270，340 mm). The VOF model was used to analyze the deformation, movement and bulge height characteristics of bubbles in liquid. The numerical simulation results were in agreement with experiment. The results show that the fluctuation degree of liquid surface caused by different liquid viscosity is significantly different. With the increase of gas flow rate and immersion depth, the liquid surface bulge height increases, and the bulge height of water in the three kinds of liquid is the largest, and the immersion depth has greater influence than the gas flow rate. Under the same injection conditions, the liquid surface flow velocity of water ,hydraulic oil and glycerin decrease in turn, and the reference velocity of glycerin increases the most obviously, but the injection stability time increases the last.

Key words: immersion top blowing, bubble, viscosity of the liquid, flow-field of liquid surface