Details of Grant 

EPSRC Reference:	GR/L57180/01
Title:	NEWER DEVELOPMENTS IN MODELS OF ACOUSTIC CAVITATION AND SONOLUMINESCENCE
Principal Investigator:	Blake, Professor J
Other Investigators:
Researcher Co-Investigators:
Project Partners:
Department:	School of Mathematics
Organisation:	University of Birmingham
Scheme:	Standard Research (Pre-FEC)
Starts:	01 August 1997	Ends:	30 September 2000	Value (£):	112,570
EPSRC Research Topic Classifications:	Non-linear Systems Mathematics
EPSRC Industrial Sector Classifications:	Aerospace, Defence and Marine
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Panel History:
Summary on Grant Application Form
One of the most exciting topics in contemporary physics is picosecond sonoluminescence, a special are of interest within acoustic cavitation. When a moderately strong intensity acoustic wave is propagated through an otherwise stationary liquid, a vapour filled cavitation bubble may develop at a weak point (e.g. by introduction of a small gas bubble, nuclei) in the liquid. During the compressional phase, high temperatures and pressures occur and, in addition, a regular emission of light may occur. Furthermore this remarkable regularity Is more accurate than the driving frequency. To date very little of the physics and chemistry is understood of the emission of light from the bubble but has recently been attributed to a strong shock wave in the vapour/gas inside the bubble. It is unlikely that the bubble can maintain its spherical shape at large accoustic pressures because of Rayleigh-Taylor or parametric instabilities and that other mechanisms for light generation also need to be investigated. Whenever asymmetries exist in the flow domain (gravity, acoustic pressure, boundaries), even a small perturbation can be excited to a full non-linear shape perturbation over 10-20 periods of oscillation. Of particular interest is the development of ultra-fast high speed jets in either the final throes of bubble collapse or near a boundary. This may have some significance with regard to the intensity of sonoluminescence.
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Organisation Website:	http://www.bham.ac.uk