Ubiquity of particle–vortex interactions in turbulent counterflow of superfluid helium.
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| Title: | Ubiquity of particle–vortex interactions in turbulent counterflow of superfluid helium. |
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| Authors: | Švančara, P.1 (AUTHOR), Duda, D.1 (AUTHOR), Hrubcová, P.1 (AUTHOR), Rotter, M.1 (AUTHOR), Skrbek, L.1 (AUTHOR), La Mantia, M.1 (AUTHOR) lamantia@mbox.troja.mff.cuni.cz, Durozoy, E.2 (AUTHOR), Diribarne, P.3 (AUTHOR), Rousset, B.3 (AUTHOR), Bourgoin, M.4 (AUTHOR), Gibert, M.2 (AUTHOR) |
| Source: | Journal of Fluid Mechanics. 3/25/2021, Vol. 911, p1-22. 22p. |
| Subjects: | Counterflows (Fluid dynamics), Particle tracking velocimetry, Superfluidity, Digital cameras, Helium, Fusion reactor blankets, Coal gasification plants |
| Abstract: | Thermal counterflow of superfluid $^4$ He is investigated experimentally, by employing the particle tracking velocimetry technique. A flat heater, located at the bottom of a vertical channel of square cross-section, is used to generate this unique type of thermally driven flow. Micronic solid particles, made in situ, probe this quantum flow and their time-dependent positions are collected by a digital camera, in a plane perpendicular to the heat source, away from the channel walls. The experiments are performed at relatively large heating powers, resulting in fluid velocities exceeding $10\ \textrm {mm}\,\textrm {s}^{-1}$ , to ensure the existence of sufficiently dense tangles of quantized vortices. Within the investigated parameter range, we observe that the particles intermittently switch between two distinct motion regimes, along their trajectories, that is, a single particle can experience both regimes while travelling upward. The regimes can be loosely associated with fast particles, which are moving away from the heat source along almost straight tracks, and to slow particles, whose erratic upward motion can be said to be significantly influenced by quantized vortices. We propose a separation scheme to study the properties of these regimes and of the corresponding transients between them. We find that particles in both regimes display non-classical, broad distributions of velocity, which indicate the relevance of particle–vortex interactions in both cases. At the same time, we observe that the fast particles move along straighter trajectories than the slow ones, suggesting that the strength of particle–vortex interactions in the two regimes is notably different. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 148682735 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Ubiquity of particle–vortex interactions in turbulent counterflow of superfluid helium. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Švančara%2C+P%2E%22">Švančara, P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Duda%2C+D%2E%22">Duda, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hrubcová%2C+P%2E%22">Hrubcová, P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rotter%2C+M%2E%22">Rotter, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Skrbek%2C+L%2E%22">Skrbek, L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22La+Mantia%2C+M%2E%22">La Mantia, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> lamantia@mbox.troja.mff.cuni.cz</i><br /><searchLink fieldCode="AR" term="%22Durozoy%2C+E%2E%22">Durozoy, E.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Diribarne%2C+P%2E%22">Diribarne, P.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rousset%2C+B%2E%22">Rousset, B.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bourgoin%2C+M%2E%22">Bourgoin, M.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gibert%2C+M%2E%22">Gibert, M.</searchLink><relatesTo>2</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Fluid+Mechanics%22">Journal of Fluid Mechanics</searchLink>. 3/25/2021, Vol. 911, p1-22. 22p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Counterflows+%28Fluid+dynamics%29%22">Counterflows (Fluid dynamics)</searchLink><br /><searchLink fieldCode="DE" term="%22Particle+tracking+velocimetry%22">Particle tracking velocimetry</searchLink><br /><searchLink fieldCode="DE" term="%22Superfluidity%22">Superfluidity</searchLink><br /><searchLink fieldCode="DE" term="%22Digital+cameras%22">Digital cameras</searchLink><br /><searchLink fieldCode="DE" term="%22Helium%22">Helium</searchLink><br /><searchLink fieldCode="DE" term="%22Fusion+reactor+blankets%22">Fusion reactor blankets</searchLink><br /><searchLink fieldCode="DE" term="%22Coal+gasification+plants%22">Coal gasification plants</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Thermal counterflow of superfluid $^4$ He is investigated experimentally, by employing the particle tracking velocimetry technique. A flat heater, located at the bottom of a vertical channel of square cross-section, is used to generate this unique type of thermally driven flow. Micronic solid particles, made in situ, probe this quantum flow and their time-dependent positions are collected by a digital camera, in a plane perpendicular to the heat source, away from the channel walls. The experiments are performed at relatively large heating powers, resulting in fluid velocities exceeding $10\ \textrm {mm}\,\textrm {s}^{-1}$ , to ensure the existence of sufficiently dense tangles of quantized vortices. Within the investigated parameter range, we observe that the particles intermittently switch between two distinct motion regimes, along their trajectories, that is, a single particle can experience both regimes while travelling upward. The regimes can be loosely associated with fast particles, which are moving away from the heat source along almost straight tracks, and to slow particles, whose erratic upward motion can be said to be significantly influenced by quantized vortices. We propose a separation scheme to study the properties of these regimes and of the corresponding transients between them. We find that particles in both regimes display non-classical, broad distributions of velocity, which indicate the relevance of particle–vortex interactions in both cases. At the same time, we observe that the fast particles move along straighter trajectories than the slow ones, suggesting that the strength of particle–vortex interactions in the two regimes is notably different. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Fluid Mechanics is the property of Cambridge University Press and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1017/jfm.2020.1017 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 1 Subjects: – SubjectFull: Counterflows (Fluid dynamics) Type: general – SubjectFull: Particle tracking velocimetry Type: general – SubjectFull: Superfluidity Type: general – SubjectFull: Digital cameras Type: general – SubjectFull: Helium Type: general – SubjectFull: Fusion reactor blankets Type: general – SubjectFull: Coal gasification plants Type: general Titles: – TitleFull: Ubiquity of particle–vortex interactions in turbulent counterflow of superfluid helium. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Švančara, P. – PersonEntity: Name: NameFull: Duda, D. – PersonEntity: Name: NameFull: Hrubcová, P. – PersonEntity: Name: NameFull: Rotter, M. – PersonEntity: Name: NameFull: Skrbek, L. – PersonEntity: Name: NameFull: La Mantia, M. – PersonEntity: Name: NameFull: Durozoy, E. – PersonEntity: Name: NameFull: Diribarne, P. – PersonEntity: Name: NameFull: Rousset, B. – PersonEntity: Name: NameFull: Bourgoin, M. – PersonEntity: Name: NameFull: Gibert, M. IsPartOfRelationships: – BibEntity: Dates: – D: 25 M: 03 Text: 3/25/2021 Type: published Y: 2021 Identifiers: – Type: issn-print Value: 00221120 Numbering: – Type: volume Value: 911 Titles: – TitleFull: Journal of Fluid Mechanics Type: main |
| ResultId | 1 |
