Sonoluminescence Characteristics from Submicron Size bubbles

마이크로 이하 기포로부터의 소노루미네센스 특성

  • 변기택 (중앙대학교 대학원 기계공학부) ;
  • 강상우 (중앙대학교 기계공학부) ;
  • 김기영 (중앙대학교 대학원 기계공학부) ;
  • 곽호영 (한국과학기술연구원 열 유동제어연구센터)
  • Published : 2004.11.03

Abstract

Sonoluminescence (SL) characteristics such as pulse shape, radiance and spectrum radiance from submicron bubbles were investigated. In this study, a set of analytical solutions of the Navier-Stokes equations for the gas inside bubble and equations obtained from mass, momentum and energy equations for the liquid layer adjacent the bubble wall were used to estimate the gas temperature and pressure at the collapse point, which are crucial parameters to determine the SL characteristics. Heat transfer inside the gas bubble as well as at the liquid boundary layer, which was not considered in the most of previous studies on the sonoluminescence was taken it into account in the calculation of the temperature distribution inside the bubble. It was found that bremsstrahlung is a very possible mechanism of the light emission from either micron or submicron bubbles. It was also found that the peak temperature exceeding $10^{6}$ K in the submicron bubble driven at 1 MHz and 4 atm may be due to the rapid change of the bubble wall acceleration near the collapse point rather than shock formation.