単一落下液滴と静止油面の衝突における液滴の変形 : 液滴の表面張力および動粘度の影響(流体工学, 流体機械)

Deformation of a liquid drop fallen on the stationary silicone-oil surface was examined in detail. Special attention was directed to the influence of the liquid-drop and silicone-oil properties on the deformation of the drop after the impact with the oil surface. Water solutions of ethanol or glycerin with various concentrations were used for liquid drop to control its surface tension σL and kinematic viscosity νL. Various kinds of silicone oils were tested that cover a wide range of kinematic viscosity νT, 1a(10)5(mm)2/s, under nearly a constant surface tension. The drop diameter at its maximum spread, dM. is influenced by not only σL and νL of the drop itself but also νT of the silicone oil. The influence of σL on dM is pronounced under the condition of νT (10)4(mm)2/s, dM/dL (dL : initial diameter of drop) for all σL and νL can be well correlated by Reynolds number and Ohnesorge number.