The Importance of Cavitation Hysteresis in Megasonic Cleaning

Abstract:

An improved fundamental understanding of the megasonic cleaning process is necessary to optimize cleaning efficiency and minimize the unwanted damage to fragile structures. Argon sonoluminescence (SL) measurements are done to achieve an improved insight in the collapse threshold and behavior of microbubbles. This paper reports on acoustic cavitation by means of Ar Sonoluminescence (SL) investigation achieved with a dedicated test cell, a photomultiplier tube (PMT) and a gasification system. The results show an increase in SL signal as a function of the applied acoustic power density. An increase in Ar concentration results in a decrease in SL signal. Furthermore, a clear hysteretic behavior in the SL signal is identified when ramping the acoustic power up and down. This hysteresis effect can be attributed to the nucleation of bubbles during the increasing branch of the power loop. Finally the time evolution of SL light after the switching on of the acoustic transducers revealed the existence of a delay time.

• Periodical: Solid State Phenomena (Volume 187)
• Pages: 171-175
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.187.171
• Online since: April 2012
• Authors: Elisabeth Camerotto, Stefan de Gendt, Marc Hauptmann, Denis Shamiryan, Marc Heyns, Paul W. Mertens, Steven Brems
• Keywords: Cavitation Hysteresis, Megasonic Cleaning, Sonoluminescence

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