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Visual observation of the bubble dynamics in normal 4He, superfluid 4He and superfluid 3He–4He mixtures

Published online by Cambridge University Press:  25 January 2009

H. ABE ,
M. MORIKAWA ,
T. UEDA ,
R. NOMURA ,
Y. OKUDA  and
S. N. BURMISTROV
H. ABE*
Affiliation:
Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1, Oh-okayama, Meguro, Tokyo 152-8551, Japan
M. MORIKAWA
Affiliation:
Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1, Oh-okayama, Meguro, Tokyo 152-8551, Japan
T. UEDA
Affiliation:
Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1, Oh-okayama, Meguro, Tokyo 152-8551, Japan
R. NOMURA
Affiliation:
Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1, Oh-okayama, Meguro, Tokyo 152-8551, Japan
Y. OKUDA
Affiliation:
Department of Condensed Matter Physics, Tokyo Institute of Technology, 2-12-1, Oh-okayama, Meguro, Tokyo 152-8551, Japan
S. N. BURMISTROV
Affiliation:
Kurchatov Institute, Moscow 123182, Russia
*
†Email address for correspondence: abe-haruka@aist.go.jp
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Abstract

In order to compare the bubble dynamics of various quantum liquids, we performed the visual observation of a sound-induced bubble in a normal liquid 4He, pure superfluid 4He, and superfluid 3He–4He liquid mixtures of saturated and unsaturated 3He concentrations. When an acoustic wave pulse was applied to these liquids under saturated vapour pressure, a macroscopic bubble was generated on the surface of a piezoelectric transducer. For all liquids, the size of the bubble increased, as a higher voltage was applied to the transducer at a fixed temperature. In the normal 4He we observed a primary bubble surrounded with many small bubbles which ascended upward together. In contrast to normal phase, only one bubble was generated in the superfluid 4He, and its shape proved to be highly irregular with an ill-defined surface. In the 3He saturated superfluid mixture, we also observed a solitary bubble but with a nearly perfect spherical shape. The bubble in this mixture expanded on the transducer surface, grew to a maximum size of the order of 1 mm and then started shrinking. As the bubble detached from the transducer with shrinking, we clearly detected an origination of the upward jet flow which penetrated the bubble. The jet velocity in the liquid mixture was approximately 102–103 times smaller than in water. At the final stage of the process we could sometimes observe a vortex ring generation. It is interesting that, though the bubble size and time scale of the phenomenon differ from those in water, the behaviour in the collapsing process had much in common with the simulation study of the vortex ring generation in water. In addition, for the mixture with the unsaturated 3He concentration of about 25% at 600 mK, the shape of the upward jet was observed distinctly, using more precise measurement with shadowgraph method.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 619 , 25 January 2009 , pp. 261 - 275
Copyright
Copyright © Cambridge University Press 2008

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