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Sliding, vibrating and swinging droplets on an oscillating fibre

We study experimentally the dynamics of a water droplet on a tilted and vertically oscillating rigid ﬁbre. As we vary the frequency and amplitude of the oscillations the droplet transitions between diﬀerent modes: harmonic pumping, subharmonic pumping, a combination of rocking and pumping modes, and a combination of pumping and swinging modes. We characterize these responses and report how they aﬀect the droplet’s sliding speed along the ﬁbre. The droplet swinging mode is explained by a minimal model making an analogy between the droplet and a forced elastic pendulum.