[PDF] Top 20 Decay of finite temperature superfluid helium-4 turbulence

... of superfluid physics developed in ...the superfluid vortex core structure is fully resolved at nanoscale distances, and the quasi-particle excitations of the vacuum state are described directly at an ... See full document

... like superfluid vortices around the small scale normal-fluid tubes, and of aligned, superfluid vortex bundles within ...of superfluid vorticity is the physical mechanism responsible for ... See full document

... turbulent superfluid flows in channels equipped for detection of quantised ...low temperature compressible volume capable of pushing or sucking superfluid 4 He into a flow ...the ... See full document

... describes helium-4 becomes Bose-Einstein condensed, giving rise to a non-zero ground state that cor- responds to an inviscid fluid ...The superfluid coexists with the (classical-like) “normal-fluid” ... See full document

... optical cell inside a helium cryostat. Hydrogen was condensed into a cup formed by a bottom capacitor plate and a guard ring 60 mm in diameter and 6 mm high. The layer of liquid was 6 mm thick. The top capacitor ... See full document

... its decay properties, with the first measurements being of the fraction of quasiparticles that were reflected back into a BBR from a turbu- lent tangle [43, 69, 70], and following measurements of the decay ... See full document

... on superfluid ones is an energy transfer that blows-up the latter to the size of the ...the superfluid that correspond to those in the normal-fluid ought to ...coherent superfluid vortex bundles ... See full document

... We now investigate the probability distribution of the intensity fluctu- ations δI (L) with length scales L within the potential range of turbulence. As we saw in Section (§ 1.3), turbulent fluctuations at the ... See full document

... produce turbulence due to a large intrinsic damping and the results presented here will only focus on measurements using grid#1 (be- low, we will often refer to grid#1 simply as “the ...dimensions 4 × ... See full document

... Second sound (a temperature-entropy wave) is a macroscopic quantum effect that arises in superfluids and perfect crystals 1,2 . The properties of second sound in He-II have been studied extensively, both ... See full document

... Andreev retroreflected signal, the Andreev scattering technique can generate a map of local reflections which reveals a structure of the vortex tangle. Furthermore, in the numerical experiment it is possible to separate ... See full document

... temperature. It is well known that boundary layers have a pronounced effect (drag, lift) upon any object immersed in a fluid and, in many cases, they govern the dynamics of the flow around three-dimensional bluff ... See full document

... Storage conditions : Store in a cool, well-ventilated place. Store and use with adequate ventilation. Store only where temperature will not exceed 125°F (52°C). Firmly secure containers upright to keep them from ... See full document

... The motivation for studying the lifetimes of metastable 1s2s 3 S states of helium and heli- umlike ions is primarily due to its use in astrophysical observations. As suggested by Gabriel and Jordan (1969) [8], and ... See full document

... chamber segment are connected to a single delay line, the two ends of. wMch are connected through discriminators to time-to-digital converters[r] ... See full document

... in temperature of ...this temperature point is called lambda ...divides helium into two parts. Those parts of helium that are below ...called superfluid helium or helium ... See full document

... Wave turbulence [1] concerns the statistical mechanics of systems containing large numbers of dispersive waves which interact conservatively. Such wave systems occur in a variety of contexts in nature and ... See full document

... For finite-temperature systems these can be found using the topological entropy (Hamma, Ionicioiu, and Zanardi, 2005a; Kitaev and Preskill, 2006; Levin and Wen, 2006), topological mutual information ... See full document

... at finite temperature can violate a Bell inequal- ity and we quantify this ...critical temperature above which non- locality cannot be detected with our inequality, raising the question of whether ... See full document

... and turbulence profiles were obtained in situ within ∼ 30 min and over an area of about 100 by 100 km during a sounding rocket experiment conducted on 26 January 2015 at Poker Flat Research Range in ...mesospheric ... See full document