ICONE23-1226 NUMERICAL STUDY ON THE INFLUENCE OF MOTION BEHAVIOR OF A DROPLET WITH DIFFERENT LIFT FORCES IN FLOWS

Abstract

The influence of the Magnus and Saffman lift acting on a droplet which moves in various flow fields is studied. The steam flow is simulated by FLUENT. The Lagrangian approach is chosen to describe a single droplet moving in flows, while carrier-phase is described by Eluerian approach. All the dynamic equations are solved by Runge-Kutta method. A group of the trajectories of droplets with different diameters are performed with and without lift forces in uniform flow, simple shear flow and wave-type plate separator flow field, respectively. The result shows that the lift forces have tiny impact on the behaviors of droplets in a uniform flow field. However, in simple shear flow fields, the lift forces affect the behaviors of droplets more significantly with rising flow shear rate and the lift forces are mostly contributed by the Saffman term. In addition, the lift forces have different effects on the behaviors of droplets with different diameters in a wave-type plate separator. The droplets with larger diameters are more sensitive to the lift forces. The conclusion verifies the importance of the lift forces in the single droplet motion model,which could be used to simulate the behavior of droplets moving in a separator.