Vibrating grid as a tool for studying the flow of pure He II and its transition to turbulence

Charalambous, Demetris and Hendry, Philip and Skrbek, Ladik and McClintock, Peter and Vinen, W. F. (2006) Vibrating grid as a tool for studying the flow of pure He II and its transition to turbulence. AIP Conference Proceedings, 850. pp. 205-206. ISSN 0094-243X

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We report a detailed experimental study of the flow of isotopically-pure He II, generated by a vibrating grid. Our measurements span a wide range of temperatures (50 mK < T < 1.37 K) and pressures (2 bar < p < 15 bar). The response of the grid was found to be of a Lorentzian form up to a sharply-defined threshold value. This threshold value does not change appreciably with pressure; the form of the resonant response of the grid is qualitatively the same for all temperatures while the threshold value is a monotonically increasing function of temperature. We discuss the measured variation of the resonant frequency of the grid as a function of applied pressure (density) of He II and relate this to a hydrodynamic effective mass of the grid. These measurements extend our previously reported studies [Nichol et al, Phys. Rev. E 70, 056307 (2004)] and form an integral part of a series of experiments aimed at providing a better understanding of classical and quantum turbulence.

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Journal Article
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AIP Conference Proceedings
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Copyright 2006 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in AIP Conference Proceedings, 850 (17), 2006 and may be found at
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15 Dec 2017 00:04
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26 Apr 2024 02:04