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Title: Energy harvesting eel

Description: To perform long endurance military missions, small, unattended sensors must generate and harvest power from their surroundings. Experiments have shown that a flexible membrane, made from piezoelectric material, can be excited in a flag-like fashion by the von Karman vortex street forming behind a bluff body to produce power to trickle charge a battery. The image shows the vortical structures exciting the membrane.

Credits: J. J. Allen* and A. J. Smits

References: Allen, J. J. & Smits, A. J. Energy Harvesting Eel. Journal of Fluids and Structures, 15, 2001, 629-640. *Mexico State University

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