Hamburg 2001 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 52: Nichtlineare Dynamik II

DY 52.6: Vortrag

Freitag, 30. März 2001, 13:15–13:30, S 5.5

Upscaling Sonoluminescence — •Ruediger Toegel¹, Bruno Gompf², Rainer Pecha², and Detlef Lohse¹ — ¹University of Twente, Department of Applied Physics, Fluid Dynamics and Heat Transfer, P.O.Box 217, 7500 AE Enschede The Netherlands — ²Universität Stuttgart, 1. Physikalisches Institut, Pfaffenwaldring 57, D-70550 Stuttgart

Sonoluminescence is the conversion of sound into light:
A small gas bubble – usually filled with argon – is trapped in a standing acoustical wave and forced into radial oscillations. It undergoes a large expansion phase and then violently collapses down to its hardcore volume. In the final phase of this collapse the heat exchange with the surrounding liquid – usually water – becomes neglegible and the bubble is heated roughly adiabatically. By this means temperatures of up to 15000K, i.e., typical energies of a few eV, can be achieved: Consequently the bubble emits a short flash of light as bright as to be visible to the naked eye.
The topic of this talk is an experimental and theoretical investigation on the possibility of enhancement of the phenomenon by lowering the frequency of the acoustical field – so called “Upscaling sonoluminescence”.