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https://hdl.handle.net/20.500.14094/0100481923

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Metadata ID
0100481923
Access Rights
open access
Version
Accepted Manuscript
Title
Effects of microbubbles on removal of viscous oil adhering to channel wall
Author
Li, Yuegui ; Hayashi, Kosuke ; Okamoto, Fuyuki ; Hosokawa, Shigeo ; Tomiyama, Akio
Author Name
Li, Yuegui
Author ID
A0964
NRID
1000060455152
ORCID
0000-0002-1595-3475
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=e78459b908f278db520e17560c007669
Author Name
Hayashi, Kosuke
林, 公祐
ハヤシ, コウスケ
Affiliation
工学研究科
Author Name
Okamoto, Fuyuki
Author ID
A0912
NRID
1000010252793
Author Name
Hosokawa, Shigeo
細川, 茂雄
ホソカワ, シゲオ
Affiliation
工学研究科
Author ID
A0901
NRID
1000030211402
KUID
https://kuid-rm-web.ofc.kobe-u.ac.jp/search/detail?systemId=f03eb022a30248d0520e17560c007669
Author Name
Tomiyama, Akio
冨山, 明男
トミヤマ, アキオ
Affiliation
工学研究科
language
English (英語)
Source Title
Chemical Engineering Research and Design
Volume (Issue)
193
Page
75-84
Publisher
Elsevier
Date of Publication
2023-05
Date of Deposit
2025-03-24
Abstract
It has been reported that the addition of microbubbles in a water flow enhances a cleaning efficiency of oil adhering to a channel wall. However, the enhancement mechanism of the cleaning effect has not been sufficiently understood yet. Experiments on the removal effects of water flows in a horizontal channel with and without microbubbles were therefore conducted to investigate the removal process by microbubbles. Silicone oil adhering to the bottom wall of the channel was used as dirt. The local thickness of the oil was measured during cleaning from micrographs of fluorescence intensity. The amount of oil removed by the water flow increased with increasing the Reynolds number. Adding microbubbles to the water flow increased the amount of removed oil. Microbubbles attached to the oil interface under turbulent conditions, and the bubbles grew by mass transfer through the gas-liquid interface and bubble coalescence. The detachment of bubbles grown on the oil interface led to oil peel-off, resulting in an improvement of cleaning effect.
Keywords
Cleaning
Oil removal
Bubble diameter
Bubble number density
Category
Graduate School of Engineering
Journal Article
Rights
© 2023 Institution of Chemical Engineers. Published by Elsevier Ltd.
CC license
This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International license.
Relation
DOI
https://doi.org/10.1016/j.cherd.2023.03.020