Journal of Mechanical Science and Technology

  • 제17권8호
  • /
  • Pages.1203-1210
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  • 2003
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  • 1738-494X(pISSN)
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  • 1976-3824(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
권호 표지

Turbulence Generation by Ultrasonically Induced Gaseous Cavitation in the $CO_2$Saturated Water Flow

  • Lee, Seung-Youp (Department of Mechanical Engineering, Graduate School, Korea University) ;
  • Park, Young-Don (Department of Mechanical Engineering, Korea University)
  • 발행 : 2003.08.01
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초록

Emission of ultrasonic vibration to turbulent flow promotes the turbulence generation due to the resonantly oscillating pressure field and thereby induced cavitation. In addition, ultrasonic vibration is well transmitted through water and not dissipated easily so that the micro-bubbles involved in the fluid induce the gaseous cavitation if the bubbles are resonated with the ultrasonic field. In the present study, we found through LDV measurement that the gaseous cavitation induced by ultrasonic vibration to CO$_2$saturated water flow in the rectangular cross-sectioned straight duct enhances turbulence much more than the case of non-ultrasonic or normal ultrasonic conditions without gaseous cavitation. We also found that the fluctuating velocity component induced by emitting the ultrasonic vibration in normal direction of a rectangular channel flow can be redistributed to stream-wise component by the agitation of gaseous cavitation.

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참고문헌

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