Chapter

Sonochemistry and Sonoluminescence

Volume 524 of the series NATO ASI Series pp 191-204

Hot Spot Conditions during Multi-Bubble Cavitation

  • K. S. SuslickAffiliated withDepartment of Chemistry, University of Illinois at Urbana-Champaign
  • , W. B. McNamaraIIIAffiliated withDepartment of Chemistry, University of Illinois at Urbana-Champaign
  • , Y. DidenkoAffiliated withDepartment of Chemistry, University of Illinois at Urbana-Champaign

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Abstract

Together with the chemical effects of ultrasound, light is often emitted [1–5]. Such sonoluminescence provides an extremely useful spectroscopic probe of the conditions created during cavitation bubble collapse. Acoustic cavitation is the origin of both sonochemistry and sonoluminescence. The collapse of bubbles caused by cavitation produces intense local heating and high pressures, with very short lifetimes. As we will demonstrate in this chapter, in clouds of cavitating bubbles, these hot spots have equivalent temperatures of roughly 5000 K, pressures of about 1000 atmospheres, and heating and cooling rates above 1010 K/s. In single bubble cavitation, conditions may be even more extreme [6–7]. Thus, cavitation can create extraordinary physical and chemical conditions in otherwise cold liquids.