Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Sonochemial and Sonophysical Effects in Heterogeneous Systems

불균일계에서의 초음파 캐비테이션 물리적 및 화학적 효과 연구

  • Lee, Dukyoung (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Son, Younggyu (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 이덕영 (국립금오공과대학교 환경공학과) ;
  • 손영규 (국립금오공과대학교 환경공학과)
  • Received : 2019.01.11
  • Accepted : 2019.03.18
  • Published : 2019.03.30
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Abstract

The objective of this study was to investigate the sonophysical and sonochemical effects induced by acoustic cavitation in heterogeneous systemin a 28 kHz double-bath reactor using calorimetry, the aluminiumfoil erosion test, and the luminol test. With no glass beads, calorimetric power in the inner vessel increased as much as the outer sonoreactor lost and total calorimetric power was maintained for various liquid height conditions (0.5 ~ 7 cm) in the vessel. Higher calorimetric energy was obtained at higher liquid height conditions. Similar results were obtained when glass beads were placed with various beads heights (0.5 ~ 2.0 cm) and relatively high calorimetric energy was obtained in spite of large attenuation in the glass beads layer. An aluminium foil placed between the bottom of the inner vessel and the glass beads layer was damaged, indicating significant sonophysical effects. Much less damage was detected when the foil was placed above the beads layer due to large attenuation of ultrasound. Sonochemical effects, visualized by sonochemiluminescence (SCL), also decreased significantly when the beads were placed in the vessel. It was established that the optimization of the liquid height above the solid-material layer could enhance the sonophysical and sonochemical effects in the double-bath sonoreactors.

Keywords

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Fig. 1. A schematic of the double-bath sonoreactor used in this study.

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Fig. 2. Calorimetric/ultrasonic energy in the sonoreactor (the outer reactor) and the vessel (the inner reactor)for various experimental conditions under the same input energy condition (290W).

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Fig. 3. Images of the damaged aluminium foil, for various experimental conditions under the same input energy condition, caused by ultrasound irradiation. (The foil was placed horizontally on the beads. Each height in the image representthe water height in the vessel).

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Fig. 4. Deformation ratio (pixel number of damaged area/pixel number of total area) under various conditions.

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Fig. 5. Images of the damaged aluminium foil, for various experimental conditions under the same input energy condition, caused by ultrasound irradiation (The foil was placed vertically on the beads. The small white dots on the foil are the pits generated by the sonophysical effects.).

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Fig. 6. SCL (Sonochemiluminescence) images in the vessel for various experimental conditions under the same input energy condition.

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