Nonlinear Bubble-Sound Interaction Phenomena
Lead Research Organisation:
Imperial College London
Department Name: Chemical Engineering
Abstract
Sonoluminescence is a fascinating and beautiful phenomenon that is probably best described as an emission of light which occurs when a liquid is subjected to intense sound waves. Sonoluminescence can be reproduced with simple equipment, costing just a few hundred pounds, yet it can appear as regular pulses of light lasting less than a billionth of a second, and is known to be associated with the attainment of temperatures in excess of 100,000 K, pressures in excess of 10 million bar and with a concentration of mechanical energy of up to 12 orders of magnitude. For this reason, the phenomenon has been termed `A Star in a Jar. Sonoluminescence is associated with nonlinear bubble-sound interactions that have a host of technological applications including surface cleaning, cell disruption, surgical procedures, nanoparticle formation and the activation of chemical reactions. Nevertheless, many mysteries remain about the true nature of sonoluminescence and the conditions reached within a collapsing bubble. Recent experiments have hinted at the attainment of conditions even more extreme than those reported hitherto and it seems to us to be very worthwhile to extend these studies.We plan to conduct experiments in which oscillating bubbles are caused to collapse (or implode) even more energetically that in previous work, and we will monitor the process by measuring the intensity and spectrum of the emitted light. At the same time, we will develop computer models of the process and refine them using data gathered in our experiments. It has been claimed that it might even be possible to reach the conditions needed for nuclear fusion to occur within a collapsing bubble. This seems doubtful, but we shall see.
Organisations
Publications
S Shae
(2008)
A numerical method for two-phase compressible Euler equations in conservative form for spherically symmetric, axisymmetric and 3D Cartesian coordinate
in Journal of Computational Physics
Shaw S
(2009)
Electrically induced bubble deformation, translation and collapse
in Journal of Engineering Mathematics
SHAW S
(2010)
Shock emission from collapsing gas bubbles
in Journal of Fluid Mechanics
Memoli G
(2009)
Design of a laboratory for experiments with a pulsed neutron source.
in Journal of radiological protection : official journal of the Society for Radiological Protection
Spelt PD
(2006)
Collapse of a bubble in an electric field.
in Physical review. E, Statistical, nonlinear, and soft matter physics
Shaw S
(2009)
The stability of a bubble in a weakly viscous liquid subject to an acoustic traveling wave
in Physics of Fluids