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dc.contributor.author
Zemma, Elisa María
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dc.contributor.author
Luzuriaga, J.
dc.contributor.author
Babuin, S.
dc.date.available
2018-02-16T20:44:00Z
dc.date.issued
2014-10
dc.identifier.citation
Zemma, Elisa María; Luzuriaga, J.; Babuin, S.; Analysis of motion of solid hydrogen tracer particles in oscillating superfluid flows; Institute of Physics Publishing; Journal of Physics: Conference Series; 568; 1; 10-2014; 012029
dc.identifier.issn
1742-6596
dc.identifier.uri
http://hdl.handle.net/11336/36684
dc.description.abstract
We have developed a relatively simple cryostat which allows us to image turbulent flows in superfluid helium at temperatures below 2 K, using frozen H2 particles. We analyze the statistics of the velocities of these solid tracers, which follow the turbulent flow generated by oscillating bodies. We have also studied one of the oscillators working in air at room temperature, and traced the flow with solid talcum particles for comparison. Images were recorded by a digital camera at 240 frames per second, while frequencies of the oscillators are between 20 to 45 Hz. The flow is characterized by a modified Reynolds number Reδ based on the viscous penetration depth δ. Software in a dedicated particle tracking velocimetry code allows us to compute the trajectories and velocities of tens of thousands of particles. We have obtained the number of particles for equally spaced intervals of the velocity modulus. For the oscillators in the superfluid, the probability of finding particles at higher velocities has an exponential decay. Within our resolution the statistics in the superfluid for oscillating objects with sharp borders is largely independent of Reδ, while the logarithmic decay at low velocities seems faster than for high velocities for rounded objects. On the other hand, for data taken in air the result is closer to a classical Gaussian distribution of velocities.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Institute of Physics Publishing
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Quantum Turbulence,
dc.subject
Critical Velocity
dc.subject
Tracer Particles,
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Analysis of motion of solid hydrogen tracer particles in oscillating superfluid flows
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-01-05T16:24:14Z
dc.journal.volume
568
dc.journal.number
1
dc.journal.pagination
012029
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Zemma, Elisa María. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Luzuriaga, J.. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro; Argentina
dc.description.fil
Fil: Babuin, S.. Czech Academy of Sciences. Institute of Physics; República Checa
dc.journal.title
Journal of Physics: Conference Series
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/1742-6596/568/1/012029
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/1742-6596/568/1/012029/meta
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