螺旋管射流搅拌桨液液非均相混合过程分析OA

Multiple hollow tubes combined into a conical surface were used as jet impellers for the liquid-liquid heterogeneous mixing.The effects of spiral and straight tubes on the mixing process were studied by experiment and numerical simulation.The results show that the spiral tube inlet is set as incident flow and the straight tube is the self-priming inlet,and the incident flow inlet effectively increases the velocity inside the tube and at the jet outlet.The stirring process can be divided into three stages of initial,mediate and later stages.During the mediate stage,the slug flow is found in the spiral tube,resulting in the dispersed phase faction close to 1 when the dispersed phase first exits the spiral tube,which is 1.5 times higher than that of the straight tube impeller.In the later stage,the incident flow effect of the spiral tube effectively improves the uniformity of the dispersed phase distribution.The vortex distribution based on the Q criterion(based on the second invariant of the velocity gradient tensor)indicates that wake vortices are formed at the backflow side of the straight tube,while no wake vortex is observed around the helical tube,which reduces the stirring resistance.The formation of inner and outer vortices at the jet outlet is facilitated by a helical tube.The helical tube with a larger pitch effectively improves the liquid-liquid heterogeneous mixing process and reduces pipeline resistance.A novel design for using nonlinear surfaces as stirring blades is provided,and the further development of jet theory in the stirring process is promoted.