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Questions related to the oscillatory flow of He II through a grid at low temperatures.

Hendry, P. C. and McClintock, Peter V. E. and Nichol, H. A. and Skrbek, L. and Vinen, W. F. (2005) Questions related to the oscillatory flow of He II through a grid at low temperatures. Journal of Low Temperature Physics, 138 (3-4). pp. 543-548. ISSN 0022-2291

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Abstract

The flow of pure He II at low temperatures and a range of pressures is probed using an electrostatically-driven oscillating grid. With increasing oscillation amplitude, a (history dependent) first threshold is reached where the initially pure superflow abruptly changes: the resonant frequency decreases and the response becomes strongly nonlinear, attributable to quantized vortices responding to the motion of the grid so as to increase its effective mass without additional damping. On further increase of oscillation amplitude a second threshold is reached, probably marking the onset of superfluid turbulence. The increase in effective mass is believed to be due to a boundary layer of vortex loops that can evolve into turbulent flow at the second threshold. Open questions and problems for future research are formulated.

Item Type: Article
Journal or Publication Title: Journal of Low Temperature Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 9371
Deposited By: Ms Margaret Calder
Deposited On: 05 Jun 2008 15:26
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 18:35
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/9371

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