Single cavitation bubble luminescence

Blake, John R.; Keen, Giles S.
July 2000
AIP Conference Proceedings;2000, Vol. 524 Issue 1, p3
Academic Journal
Experimental studies at the Cavendish Laboratory [1] and the Drittes Physikalisches Institut, Göttingen [2] have shown the emission of light from the vigorous collapse of a cavitation bubble near a rigid boundary. The Göttingen studies, using laser produced bubbles, indicate that a rapid increase in the emission of light occurs beyond a critical &ldq;stand-off&rdq; distance of the cavitation bubble from the boundary. This paper reports on theoretical studies using a modified boundary integral method approach th at has been developed to allow for toroidal bubble geometry once the high speed jet has fully penetrated the bubble interior and impacted on the far side. This provides the framework to model the essential phenomena for the motion of a single cavitation bubble near a rigid boundary. Key physical characteristics of the bubble motion which include bubble shape, particle paths, velocities, pressures and gas temperature, are presented. In the context of single bubble cavitation luminescence (SCBL) it is found that maximum jet speeds occur at a critical distance from the boundary corresponding to jet impact occurring at minimum bubble volume. In bubbles further away from the boundary, the high speed jet does not penetrate the full width of the cavity, while for closer bubbles a vigorous toroidal bubble collapse leads to the highest pressures occurring on a ring, rather than at the point of impact. This may contribute to the understanding of the Göttingen experiments.


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