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Quantum turbulence of bellows-driven .sup.4./sup.He superflow: decay
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SYSNO ASEP 0455291 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Quantum turbulence of bellows-driven 4He superflow: decay Tvůrce(i) Babuin, Simone (FZU-D) RID
Varga, E. (CZ)
Vinen, W. F. (GB)
Skrbek, L. (CZ)Zdroj.dok. Physical Review. B - ISSN 1098-0121
Roč. 92, č. 18 (2015), "184503-1"-"184503-13"Poč.str. 13 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova vortex-line density ; counterflow turbulence ; quantum turbulence Vědní obor RIV BM - Fyzika pevných látek a magnetismus Institucionální podpora FZU-D - RVO:68378271 UT WOS 000364014600004 EID SCOPUS 84948676540 DOI 10.1103/PhysRevB.92.184503 Anotace In this paper we report on studies of the temporal decay of the vortex-line density, observed when the bellows is stopped, and we compare the results with those obtained from the temporal decay of thermal counterflow remeasured in the same channel and under the same conditions. In both cases there is an initial fast decay which, for low enough initial line density, approaches for a short time the form t−1 characteristic of the decay of a random vortex tangle. This is followed at late times by a slower t−3/2 decay, characteristic of the decay of large “quasiclassical” eddies. However, in the range of investigated parameters, we observe always in the case of thermal counterflow, and only in a few cases of high steady-state velocity in superflow, an intermediate regime in which the decay either does not proceed monotonically with time or passes through a point of inflexion. This difference, established firmly by our experiments, might represent one essential ingredient for the full theoretical understanding of counterflow turbulence. Pracoviště Fyzikální ústav Kontakt Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Rok sběru 2016
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