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Impacting Jets at the Micrometer Scale due to an Oscillating and Collapsing Bubble

Badarinath Karri

Abstract


A method to create fine droplets and sprays on demand at the micrometer length scale is presented. The method is based on the flow induced by an oscillating bubble through a hole in a plate during both its expansion and collapse cycles. A square silicon plate of side 10 mm and thickness 0.5 mm and consisting of a hole of ~25 μm in diameter at its centre is placed with its top face at the surface of water in a water bath. The plate is subjected to a shock-wave from a lithotripter at its bottom surface. The interaction of the shock-wave with the free surface of water through the hole in the plate leads to the nucleation of a cavitation bubble at the bottom of the plate. The expansion of the bubble attached to the hole, leads to an initial slow jet of water to emerge from the other side of the hole. The bubble subsequently collapses leading to a faster second jet through the hole. The interaction between the two jets leads to the formation of a liquid sheet in the plane perpendicular to the jets which breaks up into a spray as the voltage of the lithotripter is increased. The formation of the bubble and the jets and their mechanism is explored by means of high-speed photography.

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DOI: http://dx.doi.org/10.21535%2FProICIUS.2012.v8.830

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