不混和静止液体層への単一液滴の衝突過程への液物性の影響

抄録

Three-fluid flows that single falling drops collide with immiscible liquid layers are numerically examined. This study is focused on the effect of physical properties of liquids on the dynamic motion of drop impact on immiscible quiescent liquid layers. In our computations, a Moment-of-Fluid (MOF) method is used to track the time evolution of the interface of three immiscible fluids, and two-dimensional axisymmetric computations are performed based on the MOF method. From numerical results, it is clearly shown that physical properties of liquids greatly affect the dynamic motion of drop impact on immiscible quiescent liquid layers. Especially, the effect of the viscosity of liquids on the drop impact is very large. Complicated and dynamic drop impact is observed when a drop with low viscosity impact on the surface of a liquid layer with low viscosity. At the same time, the dynamic behavior of drop cannot be seen when a drop with high viscosity impact on the surface of a liquid layer with low viscosity. The MOF method allows us to capture the dynamics of three-fluid flows.