Molecular Insight into the Possible Mechanism of Drag Reduction of Surfactant Aqueous Solution in Pipe Flow
The phenomenon of drag reduction (known as the “Toms effect”) has many industrial and engineering applications, but a definitive molecular-level theory has not yet been constructed. This is due both to the multiscale nature of complex fluids and to the difficulty of directly observing self-assembled...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-07-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/22/14/7573 |
| _version_ | 1797526942826627072 |
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| author | Yusei Kobayashi Hirotaka Gomyo Noriyoshi Arai |
| author_facet | Yusei Kobayashi Hirotaka Gomyo Noriyoshi Arai |
| author_sort | Yusei Kobayashi |
| collection | DOAJ |
| description | The phenomenon of drag reduction (known as the “Toms effect”) has many industrial and engineering applications, but a definitive molecular-level theory has not yet been constructed. This is due both to the multiscale nature of complex fluids and to the difficulty of directly observing self-assembled structures in nonequilibrium states. On the basis of a large-scale coarse-grained molecular simulation that we conducted, we propose a possible mechanism of turbulence suppression in surfactant aqueous solution. We demonstrate that maintaining sufficiently large micellar structures and a homogeneous radial distribution of surfactant molecules is necessary to obtain the drag-reduction effect. This is the first molecular-simulation evidence that a micellar structure is responsible for drag reduction in pipe flow, and should help in understanding the mechanisms underlying drag reduction by surfactant molecules under nonequilibrium conditions. |
| first_indexed | 2024-03-10T09:37:29Z |
| format | Article |
| id | doaj.art-a047c501d3594d349e3ad71d6a8d4c7e |
| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-10T09:37:29Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Molecular Sciences |
| spelling | doaj.art-a047c501d3594d349e3ad71d6a8d4c7e2023-11-22T04:00:48ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672021-07-012214757310.3390/ijms22147573Molecular Insight into the Possible Mechanism of Drag Reduction of Surfactant Aqueous Solution in Pipe FlowYusei Kobayashi0Hirotaka Gomyo1Noriyoshi Arai2Department of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, JapanDepartment of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, JapanDepartment of Mechanical Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8522, JapanThe phenomenon of drag reduction (known as the “Toms effect”) has many industrial and engineering applications, but a definitive molecular-level theory has not yet been constructed. This is due both to the multiscale nature of complex fluids and to the difficulty of directly observing self-assembled structures in nonequilibrium states. On the basis of a large-scale coarse-grained molecular simulation that we conducted, we propose a possible mechanism of turbulence suppression in surfactant aqueous solution. We demonstrate that maintaining sufficiently large micellar structures and a homogeneous radial distribution of surfactant molecules is necessary to obtain the drag-reduction effect. This is the first molecular-simulation evidence that a micellar structure is responsible for drag reduction in pipe flow, and should help in understanding the mechanisms underlying drag reduction by surfactant molecules under nonequilibrium conditions.https://www.mdpi.com/1422-0067/22/14/7573drag reductionsurfactant moleculesself-assemblycoarse-grained molecular simulation |
| spellingShingle | Yusei Kobayashi Hirotaka Gomyo Noriyoshi Arai Molecular Insight into the Possible Mechanism of Drag Reduction of Surfactant Aqueous Solution in Pipe Flow International Journal of Molecular Sciences drag reduction surfactant molecules self-assembly coarse-grained molecular simulation |
| title | Molecular Insight into the Possible Mechanism of Drag Reduction of Surfactant Aqueous Solution in Pipe Flow |
| title_full | Molecular Insight into the Possible Mechanism of Drag Reduction of Surfactant Aqueous Solution in Pipe Flow |
| title_fullStr | Molecular Insight into the Possible Mechanism of Drag Reduction of Surfactant Aqueous Solution in Pipe Flow |
| title_full_unstemmed | Molecular Insight into the Possible Mechanism of Drag Reduction of Surfactant Aqueous Solution in Pipe Flow |
| title_short | Molecular Insight into the Possible Mechanism of Drag Reduction of Surfactant Aqueous Solution in Pipe Flow |
| title_sort | molecular insight into the possible mechanism of drag reduction of surfactant aqueous solution in pipe flow |
| topic | drag reduction surfactant molecules self-assembly coarse-grained molecular simulation |
| url | https://www.mdpi.com/1422-0067/22/14/7573 |
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