A flow source for the study of quantum turbulence in superfluid .sup.4./sup.He

0399266 - FZÚ 2014 RIV FR eng C - Konferenční příspěvek (zahraniční konf.)
Babuin, Simone - Rotter, M. - Stammeier, M. - Šebek, Josef - Skrbek, L.
A flow source for the study of quantum turbulence in superfluid ⁴He.
EFM11 – Experimental Fluid Mechanics 2011. Les Ulis Cedex A: EDP Sciences, 2012 - (Wang, A.; Fraunie, P.; Skrbek, J.), s. 1-10. EPJ Web of Conferences, 25. ISSN 2100-014X.
[Conference on Experimental Fluid Mechanics (EFM) 2011. Jicin (CZ), 22.11.2011-25.11.2011]
Grant CEP: GA ČR GA202/08/0276
Institucionální podpora: RVO:68378271
Klíčová slova: superfluidity * ⁴He
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus

A flow source has been developed to generate turbulent superfluid flows in channels equipped for detection of quantised vortices. The source consists of a motor driven low temperature compressible volume capable of pushing or sucking superfluid He-4 into a flow channel. Detection is based on the attenuation of second sound caused by the presence of quantised vortex lines in the turbulent flow. In this paper we present the technical details of the apparatus, along with some raw data obtained during the first successful low temperature test. The test has been performed using the source to generate a flow into a channel whose ends have been blocked by superleaks to allow for the inflow and outflow of the superfluid component of helium only. This technique enables to determine the a real density of quantised vortex lines in the temperature range 1.3 to 2.1 K, with well controlled flow velocities between 0.01 and 30 cm/s.
Trvalý link: http://hdl.handle.net/11104/0226592