玻璃微珠液滴碰撞分离过程数值研究.

The coupled level set and volume of fluid (CLSVOF) method was used to simulate the collision process of glass bead droplets with the same diameter, with the physical mechanism during the collision-separation behavior of glass bead droplets mainly studied. Based on the comparative verification with ntetradecane droplet collision experiments, the morphological changes and energy change patterns of glass bead droplets during the separation process were investigated numerically. The research shows that, the energy required for the collision and separation process of glass bead droplets mainly comes from the kinetic energy and surface energy of the droplets, and most of the kinetic energy would convert into viscous dissipation energy. Through the analysis of the changes of droplet energy and average total pressure, 4 important states of droplet collision and separation were obtained, including the radial stretching to limit, the radial contraction and axial stretching to balance, the axial stretching to limit, and the droplet bridge pinching separation. The velocity and pressure distributions of the 4 states were discussed. The results reveal that, the end pinchoff mechanism is a main cause for droplet collisional separation. The work provides a basis for enriching the theory about glass bead droplet collisions. [ABSTRACT FROM AUTHOR]