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http://dx.doi.org/10.4491/KSEE.2012.34.12.787

Characteristics of Particle Separation in Water Using Lab-Scale Acoustic Standing Wave  

Ahn, Jaehwan (Environmental Eng. Research Division, Korea Institute of Construction Technology)
Kang, Sungwon (Environmental Eng. Research Division, Korea Institute of Construction Technology)
Ahn, Kwangho (Environmental Eng. Research Division, Korea Institute of Construction Technology)
Kim, I tae (Environmental Eng. Research Division, Korea Institute of Construction Technology)
Kim, Seog gu (Environmental Eng. Research Division, Korea Institute of Construction Technology)
Ahn, Hosang (Environmental Eng. Research Division, Korea Institute of Construction Technology)
Lee, Youngsup (Department of Embedded systems Engineering, Incheon University)
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Abstract
Characteristics of particle separation in water using labscale acoustic standing wave were studied. Acoustic standing wave is similar to either sound wave or ultrasonic, which makes a constant wave while returning to the origin by reflector. During that time, particulates dispersed in water are collected on the node of wave, where a sound pressure is zero. Acoustic standing wave transducer as of 28.0 kHz and 1.0 MHz were utilized and $6.8{\mu}m$ kaolin and $100.5{\mu}m$ redmud in average diameter were used as experimental materials in water. Once acoustic standing wave are generated in water, water temperature rises by $0.15{\sim}0.20^{\circ}C/min$ due to a sound pressure. Initial concentration of kaolin and redmud were controlled to have same as of 0.1, 0.2, 0.3, 0.4, 0.5 g/L, respectively. Removal efficiency of the turbidity in a reacting chamber after 5 minutes, when acoustic sound wave was formed in most distinct, was measured to have 18.2~56.2% for kaolin and 23.0~53.6% for redmud at 1.0 MHz. Particle separation was not observed at 28.0 kHz.
Keywords
Acoustic Standing Wave; Particle Separation; Kaolin; Redmud;
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