Critical velocities in 3-4He mixtures below 100 mK

J.C.H. Zeegers*, R.G.K.M. Aarts, A.T.A.M. De Waele, H.M. Gijsman

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Hydrodynamic properties of dilute mixtures of 3He and 4He were investigated below 100 mK by measuring the thermodynamic properties of the solution in various flow impedances as functions of the 3He velocity. The 4He component in the impedances was practically always macroscopically at rest. If the flow impedances consisted of a bundle of metal or glass capillaries, a distinct critical velocity was observed above which the 3He chemical-potential difference across the impedance was nonzero. The critical velocity of capillaries with diameter d roughly follows a ln(d)/d dependence. In the critical-velocity region, the amplitude of the pressure fluctuations was observed to be relatively large and strongly velocity dependent. The characteristic time for transient effects in the flow system changed abruptly at the critical velocity. There are indications for the existence of a second critical velocity. In flow impedances with an annular cross section, no critical velocities were observed.

Original languageEnglish
Pages (from-to)12442-12456
Number of pages15
JournalPhysical Review B (Condensed Matter)
Issue number21
Publication statusPublished - 1 Jan 1992
Externally publishedYes


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