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Numerical simulations of vorticity banding of emulsions in shear flows
https://oist.repo.nii.ac.jp/records/1421
https://oist.repo.nii.ac.jp/records/1421a1581108-5094-4a6b-89c4-4855298fa0b0
名前 / ファイル | ライセンス | アクション |
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source (7.9 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2020-04-28 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Numerical simulations of vorticity banding of emulsions in shear flows | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者(英) |
De Vita, Francesco
× De Vita, Francesco× Rosti, Marco Edoardo× Caserta, Sergio× Brandt, Luca |
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書誌情報 |
en : Soft Matter 巻 16, 号 11, p. 2854-2863, 発行日 2020-02-28 |
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抄録 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Multiphase shear flows often show banded structures that affect the global behavior of complex fluids e.g. in microdevices. Here we investigate numerically the banding of emulsions, i.e. the formation of regions of high and low volume fractions, alternated in the vorticity direction and aligned with the flow (shear bands). These bands are associated with a decrease of the effective viscosity of the system. To understand the mechanism of experimentally observed banding, we have performed interface-resolved simulations of the two-fluid system. The experiments were performed starting with a random distribution of droplets, which under the applied shear, evolve in time resulting in a phase separation. To numerically reproduce this process, the banded structures are initialized in a narrow channel confined by two walls moving in opposite directions. We find that the initial banded distribution is stable when droplets are free to merge and unstable when coalescence is prevented. In this case, additionally, the effective viscosity of the system increases, resembling the rheological behavior of suspensions of deformable particles. Droplet coalescence, on the other hand, allows emulsions to reduce the total surface of the system and, hence, the energy dissipation associated with the deformation, which in turn reduces the effective viscosity. | |||||
出版者 | ||||||
出版者 | The Royal Society of Chemistry | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1744-683X | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 1744-6848 | |||||
PubMed番号 | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | PMID | |||||
関連識別子 | info:pmid/32107513 | |||||
DOI | ||||||
関連タイプ | isVersionOf | |||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1039/C9SM01898K | |||||
権利 | ||||||
権利情報 | © 2020 The Royal Society of Chemistry | |||||
関連サイト | ||||||
識別子タイプ | URI | |||||
関連識別子 | https://pubs.rsc.org/en/content/articlelanding/2020/sm/c9sm01898k#!divAbstract | |||||
著者版フラグ | ||||||
出版タイプ | AM | |||||
出版タイプResource | http://purl.org/coar/version/c_ab4af688f83e57aa |