36kHz 초음파 반응기에서의 원주파수 및 파생주파수의 음압 분포 분석 = The Analysis of Acoustic Emission Spectra in a 36 kHz Sonoreactor

다국어 초록 (Multilingual 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.

참고문헌 (Reference)

1 Frohly, J., "Ultrasonic cavitation monitoring by acoustic noise power measurement" 108 (108): 2012-2020, 2000

2 Kojima, Y., "The effects of acoustic flow and mechanical flow on the sonochemical efficiency in a rectangular sonochemical reactor" 17 (17): 978-984, 2010

3 Grieser, F., "The effect of surface active solutes on bubbles exposed to ultrasound" 89-90 : 423-438, 2001

4 Adewuyi, Y.G., "Sonochemistry: Environmental science and engineering Applications" 40 (40): 4681-4715, 2001

5 Avvaru, B., "Oscillating bubble concentration and its size distribution using acoustic emission spectra, Ultrason" 16 (16): 105-115, 2009

6 Son, Y., "Investigation of acoustic cavitation energy in a large-scale sonoreactor" 16 (16): 552-556, 2009

7 Beckett, M.A., "Impact of ultrasonic frequency on aqueous sonoluminescence and sonochemistry" 105 (105): 3796-3802, 2001

8 Hodnett, M., "High-frequency acoustic emissions generated by a 20 kHz sonochemical horn processor detected using a novel broadband acoustic sensor: a preliminary study" 11 (11): 441-454, 2004

9 Son, Y., "Geometric optimization of sonoreactors for the enhancement of sonochemical activity" 115 (115): 4096-4103, 2011

10 Asakura, Y., "Effects of ultrasonic frequency and liquid height on sonochemical efficiency of large-scale sonochemical reactors" 15 (15): 244-250, 2008

11 Lee, J., "Development and optimization of acoustic bubble structures at high frequencies" 18 (18): 92-98, 2011

12 Son, Y., "Comparison of calorimetric energy and cavitation energy for the removal of bisphenol-A: The effects of frequency and liquid height" 183 : 39-45, 2012

13 Ashokkumar, M., "Acoustic emission spectra from 515 kHz cavitation in aqueous solutions containing surfaceactive solutes" 129 (129): 2250-2258, 2007

14 Son, Y., "Acoustic emission spectra and sonochemical activity in a 36kHz sonoreactor" 19 (19): 16-21, 2012

15 Price, G.J., "Acoustic emission from cavitating solutions:implications for the mechanisms of sonochemical reactions" 109 (109): 17799-17801, 2005