単一落下水滴と静止油面の衝突における界面変形

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Detailed observations have been conducted on the interfacial deformation of the silicone oil surface and a water drop fallen on it. Eleven kinds of silicone oils with wide variations of kinematic viscosity, ν_T=1〜10^5mm^2/s, have been tested. The oil surface is disturbed by a water drop with a diameter d_L=3.1mm, which falls freely on it from on height of 100mm〜1000mm. Special attention has been directed to the maximum depth of the cavity formed on the oil surface D_M, and to the maximum diameter of the water drop spreading on the oil surface d_M. We have categorized the configurations of the oil cavity into seven patterns, and those of the water drop at the oil-water interface into five patterns. The maximum cavity depth D_M/d_L can be well correlated by a dimensionaless group Re_<TL>We_<TL>where Re_<TL> is Reynolds number based on d_L and ν_T and We_<TL> is Weber number with the water density and surface tension of oil. The maximum diameter of the impacting water drop d_M/d_L can be correlated by the Reynolds number with a viscosity of water(Re_L)and the Ohnesorge number(Oh). Moreover, the condition under which the impacting water drop is smashed into pieces has been also examined based on Re_L and Oh.
社団法人日本機械学会の論文
2000-01-25