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dc.contributor.authorŠvančara, Patrik
dc.contributor.authorDuda, Daniel
dc.contributor.authorHrubcová, Petra
dc.contributor.authorRotter, Miloš
dc.contributor.authorSkrbek, Ladislav
dc.contributor.authorLa Mantia, Marco
dc.contributor.authorDurzoy, E
dc.contributor.authorDiribarne, Pantxo
dc.contributor.authorRousset, Bernard
dc.contributor.authorBourgoin, Mickaél
dc.contributor.authorGibert, Mathieu
dc.date.accessioned2021-06-14T14:21:57Z-
dc.date.available2021-06-14T14:21:57Z-
dc.date.issued2021
dc.identifier.citationŠVANČARA, P., DUDA, D., HRUBCOVÁ, P., ROTTER, M., SKRBEK, L., LA MANTIA, M., DURZOY, E., DIRIBARNE, P., ROUSSET, B., BOURGOIN, M., GIBERT, M. Ubiquity of particle-vortex interactions in turbulent counterflow of superfluid helium. Journal of Fluid Mechanics, 2021, roč. 911, č. A8, s. 1-22. ISSN 0022-1120.cs
dc.identifier.issn0022-1120
dc.identifier.uri2-s2.0-85100016591
dc.identifier.urihttp://hdl.handle.net/11025/43653
dc.format22 s.cs
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherCambridge University Pressen
dc.relation.ispartofseriesJournal of Fluid Mechanicsen
dc.rights© Cambridge University Pressen
dc.titleUbiquity of particle-vortex interactions in turbulent counterflow of superfluid heliumen
dc.typečlánekcs
dc.typearticleen
dc.rights.accessopenAccessen
dc.type.versionpublishedVersionen
dc.description.abstract-translatedThermal counterflow of superfluid 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, 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.en
dc.subject.translatedSuperfluiden
dc.subject.translatedVortex Filamentsen
dc.subject.translatedBose-Einstein Condensatesen
dc.identifier.doi10.1017/jfm.2020.1017
dc.type.statusPeer-revieweden
dc.identifier.document-number611163300001
dc.identifier.obd43932686
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