Abstract
The behavior of interface between a water droplet dyed red to make clear its boundary and silicone oil surface on which the droplet falls was observed by using a high speed video recorder with 500 frames per second. Eleven kinds of silicone oil whose kinematic viscosity νT is 1 mm2/s to 105mm2/s were used as the target liquid. A droplet having 3.1mm diameter falls freely from a micropipet whose height was varied between 100mm and 1000mm. The configuration of silicone oil cavity at its deepest state and that of deformed droplet at its maximum spread were classified into seven and five respectively based on their observation results. Under some conditions disintegration of droplet were observed, which accompanied remarkable deformation of oil surface at lower viscosity νT≥≤10mm2/s, while it occurred on the plane oil surface at higher viscosity of νT≥5×10mm2/s.
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