Session MH: Surface Tension Effects I

8:00 AM–10:10 AM, Tuesday, November 25, 2008
Room: 101B

Chair: Chao Sun, University of Twente

Abstract ID: BAPS.2008.DFD.MH.10

Abstract: MH.00010 : Dynamical Origami

9:57 AM–10:10 AM

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  Christophe Josserand
    (Universit\'e Pierre et Marie Curie, Institut d'Alembert, Paris)

  Arnaud Antkowiak
    (Universit\'e Pierre et Marie Curie, Institut d'Alembert, Paris)

  Fabien Ch\'eranc\'e
    (Universit\'e Pierre et Marie Curie, Institut d'Alembert, Paris)

A drop falling on a thin elastic sheet is rapidly trapped after impact by self-folding of the sheet around the drop. This trapping process, due to capillary forces, occurs on the fast timescale of hydrophobic rebound. The resulting packed drop presents a complex three-dimensional shape, characteristic of the interplay between elasticity and capillarity (Py \textit{et al.}, \textit{Phys. Rev. Lett.} \textbf{98}, 2007). We study experimentally the encapsulation dynamics with high-speed video camera. A shape selection exhibited by the system is evidenced. The role played by the different parameters of impact (drop radius, impact velocity...) in the final shape of this ``dynamical origami'' is eventually discussed.

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