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タイトル	en Bubble drag in electrolytically generated microbubble swarms with bubble-vortex interactions
作成者	en Watanabe, Yasunori NRID 1000020292055 en Oyaizu, Haruhi en Satoh, Hisashi NRID 1000080326636 en Niida, Yasuo
アクセス権	open access
権利情報	http://creativecommons.org/licenses/by-nc-nd/4.0/ en Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
主題	Other en Microbubbles Other en Bubble drag Other en Bubble-vortex interaction NDC 423
内容注記	Abstract en Air bubbles entrained in ocean breaking waves play various roles in air-sea gas transfer, wave energy dissipation, and surface layer mixing. While sub-mm bubbles dominate the distribution of sizes observed in bubble plumes created by breaking waves, the dynamics of such microbubbles in a swarm are poorly understood, and most previous experimental and computational studies have focused on the behavior of homogeneous swarms of larger mm-scale bubbles for industrial applications. Here, we propose novel probabilistic empirical models of rise velocity and bubble drag for a microbubble swarm incorporating bubble- vortex interactions. These are based on image measurements of the motion of electrolytically generated microbubbles. We found that convective interactions between bubbles and vortex-induced flows, that is, Rayleigh-Taylor instability caused by density difference near the electrodes, induce counter-rotating vortices that accelerate bubbles and align them along paths in the flow induced between them, resulting in an increase in rise velocity and its variance in the statistical equilibrium state. We describe the statistical features of bubble rise in such swarms in our proposed empirical model and deduce its optimal parameters. We anticipate our findings being a starting point for understanding behaviors of oceanic bubbles possessing an analogous size distribution to the present electrolytically generated microbubbles.
出版者	en Elsevier
日付	Issued2021-03
言語	eng
資源タイプ	journal article
出版タイプ	VoR
資源識別子	HDL http://hdl.handle.net/2115/81299
関連	isIdenticalTo DOI https://doi.org/10.1016/j.ijmultiphaseflow.2020.103541
収録誌情報	PISSN 0301-9322 en International journal of multiphase flow 巻136 開始ページ103541
ファイル	fulltext Article.pdf 7.13 MB (application/pdf) Issued2021-03 fulltext Supplementary Data 1.mp4 1.29 MB (video/mp4) Issued2021-03 fulltext Supplementary Data 2.mp4 8.44 MB (video/mp4) Issued2021-03 fulltext Supplementary Data 3.mp4 2.2 MB (video/mp4) Issued2021-03 fulltext Supplementary Data 4.mp4 5.6 MB (video/mp4) Issued2021-03 fulltext Supplementary Data 5.mp4 5.65 MB (video/mp4) Issued2021-03
コンテンツ更新日時	2023-07-26