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When a gaseous bubble in liquid is excited by acoustic waves, it oscillates (expands and shrinks) at the wave frequencies and generates strong vortical flows around it, the so-called cavitational microstreaming. This article describes the development of a micropumping principle using cavitational microstreaming. The key idea is to place a capillary tube vertically above an oscillating bubble to collect...
This paper describes development and experimental verifications of a novel underwater propulsion technique using AC-electrowetting-actuated oscillating bubbles. To prove the concept of propulsion, an air bubble (300 ??m dia. or 1.5 mm dia.) is installed on the tip of a metal rod covered with electrowetting dielectric layers. When an AC-electrowetting signal is applied between the metal rod and water...
This paper describes development and experimental verifications of a novel propulsion and rotation technique for water-floating objects. As opposed to mechanical paddling, this technique electrically controls surface tension forces acting on water-floating objects without any moving parts (so-called electrowetting-on-dielectric, EWOD). As a proof of concept, a mini water-floating boat of centimeter...
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