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The figure above (by student AR Jamaluddin) has rotational symmetry about the axis shown by the black horizontal line in the figure. It shows a region of water 1.2 mm long, in which sites a spherical air bubbles of radius 60 microns. A lithotripter shock wave is incident from the left. It causes the bubble to collapse and involute, such that the 'upstream' bubble wall forms a liquid jet that passes through the middle of the bubble. When this impacts the 'downstream' bubble wall, a blast wave is produced. Details of the Computational Fluid Dynamics can be downloaded in pdfs from here. The relevance of this to the treatment of kidney stones is explained in a presentation which can be reached by clicking here. High speed photography of a similar laser-induced bubble jetting event can be found by clicking here (AR Jamaluddin, GJ Ball, TG Leighton).
This page was last updated by TG Leighton, 6 August 2004
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