In this contribution we present the characterization of a bubble curtain produced with compressed air. The final goal is to implement a PIV system, with bubbles as tracers, that will help to understand drag and propulsion of a swimmer during a dolphin kick. The system will be used directly in a swimming pool. The first trials were made in a controlled water channel.

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The behavior of a water drop on a hydrophobic substrate subject to vertical vibrations is described. The dynamics of the surface passes through different phases: harmonic, geometric and chaotic (Flores Galicia et al.). To characterize the motion in terms of quantifiable variables, the height at different points on the surface was measured as a function of time. A Fourier analysis of the signal was made to determine the frequency response to changes in the forcing.