title: Flow of He II due to an oscillating grid in the low-temperature limit.
abstract: The macroscopic flow properties of pure He II are probed in the limit of zero temperature using an oscillating grid. As the oscillation amplitude passes a first critical threshold, the resonant frequency starts decreasing but the flow remains nondissipative. Beyond a second critical amplitude, the flow undergoes a transition to turbulence and becomes dissipative. Nonlinearity and hysteresis observed between the thresholds are attributed to a boundary layer of quantized vortices.
authors.affiliation: Department of Physics, Lancaster University, Lancaster LA1 4YB, United Kingdom.
authors.forename: H A
authors.initials: HA
authors.lastname: Nichol
authors.forename: L
authors.initials: L
authors.lastname: Skrbek
authors.forename: P C
authors.initials: PC
authors.lastname: Hendry
authors.forename: P V E
authors.initials: PV
authors.lastname: McClintock