Study on jetting droplet formation regime in a low-speed annular shear flow field

Abstract

This study aims to explore the mechanism of droplet generation and the change rule of liquid bridge in an annular shear flow field. With the help of a two-phase system of continuous phase (deionized water)-dispersed phase (fluorescent oil), the process of droplet generation under the jetting mechanism was captured using a camera. By studying the effect of the dispersed phase flow rate on the length of the liquid bridge, it was found that the volume flow rate of the dispersed phase is positively correlated with the frequency of droplet formation and the droplet size, and that the distance of the liquid bridge is also positively correlated with the droplet size under the jetting mechanism. Besides, a prediction mechanism for the maximum stable droplet under the jetting mechanism is proposed based on the droplet formation process.