2024-03-29T06:06:27Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00026223
2023-01-16T04:16:45Z
320:321:322
Measurement of distribution of broadband noise and sound pressures in sonochemical reactor
Yasuda, Keiji
78641
Nguyen, Tam Thanh
78642
Asakura, Yoshiyuki
78643
Broadband noise
Sound pressure
Sonochemical reactor
Reaction field
Second harmonic frequency
Cross-sectional area distribution of broadband noise in a sonochemical reactor was measured to estimate reaction fields. A needle-type hydrophone scanned the sonochemical reactor in horizontal and vertical directions at one-millimeter interval. To show an absolute value of broadband noise, average of broadband sound pressure was defined. The distribution of sound pressures at the fundamental and second harmonic frequencies were also measured. In the case of driving frequency at 130 kHz, sonochemical reaction fields were observed in several ellipse shapes. The reaction fields in upper part of the reactor was high because cavitation bubbles moved upper part due to radiation force. The sound pressure distribution at the fundamental frequency showed existence of standing wave and reaction fields were weak at pressure antinode because cavitation bubbles were repelled by primary Bjerknes force. The sound pressure distribution at the second harmonic frequency indicated that the pattern of bubbles distribution resembled to that of reaction fields closely. In the case at 43 kHz, distributions of reaction fields and sound pressures were complex due to coupled vibration. The reaction fields were relatively weak in areas which had very high sound pressures at the fundamental frequency.
ファイル公開:2020-05-01
journal article
Elsevier
2018-05
application/pdf
Ultrasonics Sonochemistry
43
23
28
1350-4177
https://nagoya.repo.nii.ac.jp/record/26223/files/Yasuda.pdf
eng
https://doi.org/10.1016/j.ultsonch.2017.12.051
© 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/