Experimental Study Of Drop Breakup Mechanisim In Liquid-Liquid Dispersion System

Drop Breakage behavior is the most significant features of the Liquid-Liquid dispersion system, which can significantly change the flow field structure and the interface between liquid and liquid; thereby can affect the characteristics of the whole system deeply. The deformation and breakup process of single viscous drop in jet flow fields has been investigated by high speed camera system. Simultaneously, the jet flow fields without dispersion phase were investigated by particle image velocimetry (PIV). The law of single drop breakup in jet flow fields has been to gather statistics. Also, the mechanisim of drop breakup were analyzed by combined the single-phase flow fields information and statistics.On the study of single phase jet flow, deionized water is injected into the plexiglass tank of four flow rate through jet pipe. The hydrodynamics characteristics of single phase jet flow without drop has been studied experimentally by 2DPIV. Results show that Jet fluid jet flow fields have a certain symmetry. With increased distance from the entrance, the cross section of jet flow were widened. The region of high average velocity and high turbulent kinetic energy dissipation rate was near the jet entrance region. At the entrance of the flow field, the ambient fluid was entrainment by jet fluid due to the high velocity gradient. An obvious high shear rate has also been found in the fields speed up to 100 s-1.The drop breakage behavior has been invesigated in 24 conditions (two kinds of initial equivalent diameter and three drop generator position) by high speed camera. The parameters of deformation, daughter drops'numbers and diameters were obtained. Results show that on the same generater position, the number of daughter drops increases with jet flow rate, the maximum number of daughter drops also increases. At the same jet flow, with the depth of the drop generator location, the number of daughter drops reduces. Comparison of two equivalent diameter of mother drop, the drop with larger equivalent diameter were more prone to breaking.