Water Model Experiment of Bottom Blown Bubble Movement Behavior and its Effect on Mixing Uniformity

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.

Keywords

• water model experiment； slit width； bottom blow flow rate； bubble motion； mixing uniform time