単一落下水滴と静止油面の衝突における界面変形 : 水滴径の影響(流体工学, 流体機械)

概要

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The deformation of the interface between a water drop and silicone-oil surface impacted by it was examined in detail. Special attention was directed to the influences of the water-drop diameter d_L on the deformation of oil surface and on that of the water drop itself after the impact with the oil surface. The drop diameter was varied from 1.9 mm to 4.1 mm. The influences of d_L on the shape of oil cavity at its maximum depth and on the drop shape at its maximum spread were observed conspicuously in case of minimum oil viscosity of v_T=5 mm^2/s. It was also found that both the maximum cavity depth ratio D_M/d_L and the maximum diametral deformation ratio d_M/d_L became smaller as d_L was increased. These deformation parameters D_M/d_L and d_M/d_L could be well correlated with the impact velocity of drop u_L for each oil viscosity. Moreover, in Case B, C and D, D_M/d_L could be correlated by a dimensionless group Re_TLWe_TL, and d_M/d_L was correlated by Re^2_LOh for highly viscous silicone oil of v_T ≧ 5 × 10^3 mm^2/s.
社団法人日本機械学会の論文
2002-09-25