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Capillary Wave and Initial Spreading Velocity at Impact of Drop onto a Surface
Author(s): P. F. Li, S. F. Wang, W. L. Dong
Keywords: Drop impact; Capillary wave; initial spreading velocity; Impact velocity; Contact line.
The capillary wave and initial spreading velocity in the spreading phase of drop impacting on a glass surface are studied experimentally, while the drop photos are obtained by using a high-speed video camera, which can catch up to 9000 images per second with an exposure time of 4 µs. A wide range of impact velocities are studied by varying the fall height, showing different capillary waves. All attention is given to the capillary wave and initial spreading velocity of drop. A non-linear relation between the wavelength and the impact velocity is found experimentally. Combined with the minimum spreading radius theory, a linear relation between the initial spreading velocity and the impact velocity is acquired.