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Capillary wave and initial spreading velocity at impact of drop onto a surface
Author(s): Li PengFei, Wang SuoFang, Dong Weilin
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 which are studied experimentally 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. This work shows that the wavelength decreases when the impact velocity increases. A linear relation between the initial spreading velocity and the impact velocity is found. Combined with the minimum spreading radius theory, it can be work out that the initial spreading velocity is 4.3 times faster than the impact velocity.