Multiple critical velocities in oscillatory flow of superfluid 4He due to quartz tuning forks

Schmoranzer, David and Jackson, Martin and Tsepelin, Viktor and Poole, Malcolm and Woods, Andrew and Clovecko, Marcel and Skrbek, Ladislav (2016) Multiple critical velocities in oscillatory flow of superfluid 4He due to quartz tuning forks. Physical review B, 94 (21). ISSN 1098-0121

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Abstract

We report recent investigations into the transition to turbulence in superfluid $^4$He, realized experimentally by measuring the drag forces acting on two custom-made quartz tuning forks with fundamental resonances at 6.5 kHz and 55.5 kHz, in the temperature range 10 mK to 2.17 K. In pure superfluid in the zero temperature limit, three distinct critical velocities were observed with both tuning forks. We discuss the signicance of all critical velocities and associate the third critical velocity reported here for the first time with the development of large vortical structures in the flow, which thus starts to mimic turbulence in classical fluids. The interpretation of our results is directly linked to previous experimental work with oscillators such as tuning forks, grids and vibrating wires, focusing on the behavior of purely superfluid $^4$He at very low temperatures

Item Type: Journal Article
Journal or Publication Title: Physical review B
Additional Information: © 2016 American Physical Society
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 83002
Deposited By: ep_importer_pure
Deposited On: 17 Nov 2016 14:58
Refereed?: Yes
Published?: Published
Last Modified: 19 Oct 2019 00:54
URI: https://eprints.lancs.ac.uk/id/eprint/83002

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