Journal of Soil and Groundwater Environment (한국지하수토양환경학회지:지하수토양환경)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
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The Analysis of Acoustic Emission Spectra in a 36 kHz Sonoreactor

36kHz 초음파 반응기에서의 원주파수 및 파생주파수의 음압 분포 분석

  • Son, Younggyu (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 손영규 (국립금오공과대학교 환경공학과)
  • Received : 2016.11.14
  • Accepted : 2016.11.30
  • Published : 2016.12.31
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Abstract

Acoustic emission spectra was analyzed to investigate the distribution of sound pressure in a 36 kHz sonoreactor. The sound pressure of fundamental frequency (f: 36 kHz), harmonics (2f: 72 kHz, 3f: 108 kHz, 4f: 144 kHz, 5f: 180 kHz, 6f: 216 kHz), and subharmonics (1.5f: 54 kHz, 2.5f: 90 kHz, 3.5f: 126 kHz, 4.5f: 162 kHz, 5.5f: 198 kHz, 6.5f; 234 kHz) was measured at every 5 cm from the ultrasonic transducer using a hydrophone and a spectrum analyzer. It was revealed that the input power of ultrasound, the application of mechanical mixing, and the concentration of SDS affected the sound pressure distributions of the fundamental frequency and total detected frequencies frequencies significantly. Moreover a linear relationship was found between the average total sound pressure and the degree of sonochemical oxidation while there was no significant linear relationship between the average sound pressure of fundamental frequency and the degree of sonochemical oxidation.

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References

  1. Adewuyi, Y.G., 2001, Sonochemistry: Environmental science and engineering Applications, Ind. Eng. Chem. Res., 40(22), 4681-4715. https://doi.org/10.1021/ie010096l
  2. Asakura, Y., Nishida, T., Matsuoka, T., and Koda, S., 2008, Effects of ultrasonic frequency and liquid height on sonochemical efficiency of large-scale sonochemical reactors, Ultrason. Sonochem., 15(3), 244-250. https://doi.org/10.1016/j.ultsonch.2007.03.012
  3. Ashokkumar, M., Hodnett, M., Zeqiri, B., Grieser, F., and Price, G.J., 2007, Acoustic emission spectra from 515 kHz cavitation in aqueous solutions containing surfaceactive solutes, J. Am. Chem. Soc., 129(8), 2250-2258. https://doi.org/10.1021/ja067960r
  4. Avvaru, B. and Pandit, A., 2009, Oscillating bubble concentration and its size distribution using acoustic emission spectra, Ultrason. Sonochem., 16(1), 105-115. https://doi.org/10.1016/j.ultsonch.2008.07.003
  5. Beckett, M.A., 2001, Impact of ultrasonic frequency on aqueous sonoluminescence and sonochemistry, J. Phys. Chem. A, 105(15), 3796-3802. https://doi.org/10.1021/jp003226x
  6. Frohly, J., Labouret, S., Bruneel, C., Looten-Baquet, I., and Torguet, R., 2000, Ultrasonic cavitation monitoring by acoustic noise power measurement, J. Acoust. Soc. Am., 108(5), 2012-2020. https://doi.org/10.1121/1.1312360
  7. Grieser, F. and Ashokkumar, M., 2001, The effect of surface active solutes on bubbles exposed to ultrasound, Adv. Colloid. Interfac., 89-90, 423-438. https://doi.org/10.1016/S0001-8686(00)00064-6
  8. Hodnett, M., Chow, R., and Zeqiri, B., 2004, High-frequency acoustic emissions generated by a 20 kHz sonochemical horn processor detected using a novel broadband acoustic sensor: a preliminary study, Ultrason. Sonochem., 11(6), 441-454. https://doi.org/10.1016/j.ultsonch.2003.09.002
  9. Kojima, Y., Asakura, Y., Sugiyama, G., and Koda, S., 2010, The effects of acoustic flow and mechanical flow on the sonochemical efficiency in a rectangular sonochemical reactor, Ultrason. Sonochem., 17(6), 978-984. https://doi.org/10.1016/j.ultsonch.2009.11.020
  10. Lee, J., Ashokkumar, M., Yasui, K., Tuziuti, T., Kozuka, T., Towata, A., and Lida, Y., 2011, Development and optimization of acoustic bubble structures at high frequencies, Ultrason. Sonochem., 18(1), 92-98. https://doi.org/10.1016/j.ultsonch.2010.03.004
  11. Price, G.J., Ashokkumar, M., Hodnett, M., Zequiri, B., and Grieser, F., 2005, Acoustic emission from cavitating solutions: implications for the mechanisms of sonochemical reactions, J. Phys. Chem. B, 109(38), 17799-17801. https://doi.org/10.1021/jp0543227
  12. Son, Y., Lim, M., Ashokkumar, M., and Khim, J., 2011, Geometric optimization of sonoreactors for the enhancement of sonochemical activity, J. Phys. Chem. C, 115(10), 4096-4103. https://doi.org/10.1021/jp110319y
  13. Son, Y., Lim, M. and Khim, J., 2009, Investigation of acoustic cavitation energy in a large-scale sonoreactor, Ultrason. Sonochem., 16(4), 552-556. https://doi.org/10.1016/j.ultsonch.2008.12.004
  14. Son, Y., Lim, M., Khim, J., and Ashokkumar, M., 2012a, Acoustic emission spectra and sonochemical activity in a 36 kHz sonoreactor, Ultrason. Sonochem., 19(1), 16-21.
  15. Son, Y., Lim, M., Khim, J., Kim, L.H., and Ashokkumar, M., 2012b, Comparison of calorimetric energy and cavitation energy for the removal of bisphenol-A: The effects of frequency and liquid height, Chem. Eng. J., 183, 39-45. https://doi.org/10.1016/j.cej.2011.12.016