Abstract
We investigate capillary oscillations of a sessile drop experimentally. Following Suzuki et al., we put a hemispherical drop on a small horizontal stage and excited capillary oscillations by vibrating the stage at resonant frequencies, and recorded its shape evolution by a high-speed video camera. From the videos, we quantitative time evolution of the drop deformation, and obtained its power spectrum. In the spectrum, we found several discrete spectrum peaks, corresponding to the eigen-frequency and its higher harmonics, and broad band spectrum at smaller frequencies.
