Abstract
Abstract The influence of the supporting surface on the resonant frequency of pendant droplets has been examined experimentally. It has been shown that for spherical pendant droplets the correction term due to the boundary conditions at the supporting surface depends on the geometry and material of the supporting element, but also on the liquid of the droplet, which makes calibration impossible. In contrast, for hemispherical pendant droplets the influence of the boundary conditions can be kept constant and can be eliminated after calibration. A method for measuring the surface tension in real time from the resonant frequency of a hemispherical droplet has been proposed and errors have been evaluated.
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