Abstract: ：The effects of slit width and flow rate on the size， quantity， velocity and force of bubbles are analyzed by estab lishing an experimental platform of bottom blown metal molten pool water model and using high-speed photography and im age processing methods. The mixing condition of the solution was reflected by measuring the change of the electrical con ductivity in the solution， so as to determine the stirring intensity of the solution by the structure and parameters of the bot⁃ tom blowing. The results show that the bubble movement is mainly affected by the buoyancy and drag force， and the Sauter diameter of the bubble increases with the increase of the slit width and the bottom blowing flow rate. The larger the bubble， the more favorable the stirring of the solution and the shortening of the mixing time， while the change trend of the bubble number is opposite. The rising speed of the bubble is proportional to the bottom blowing flow rate and inversely pro⁃ portional to the slit width. The experiment results show that when the slit width is 0. 30 mm and the bottom blowing flow rate is 1. 00 L/min， the mixing uniform time is the shortest.

Key words: Water Model Experiment, Slit Width, Bottom Blow Flow Rate, Bubble Motion, Mixing Uniform Time

摘要： 建立底吹金属熔池水模实验平台，采用高速摄影技术及图像处理手段，分析了狭缝宽度和底吹流量对气泡 的大小、数量、速度、受力的影响规律；通过测量溶液内电导率的变化来反映溶液的混匀情况，明确底吹结构和参数 对溶液的搅拌强度。结果表明，气泡运动主要受浮力和曳力的影响，气泡的索特直径随狭缝宽度、底吹流量的增大 而增大，气泡越大越有利于溶液搅拌，从而缩短混匀时间，而气泡数量的变化趋势则与之相反；气泡上升速度与底< 吹流量成正比，与狭缝宽度成反比；结果表明，当狭缝宽度为0. 30 mm，底吹流量为1. 00 L/min时，混匀时间最短。

关键词: 水模实验, 狭缝宽度, 底吹流量, 气泡运动, 混匀时间