| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Depression of the Superfluid Transition Temperature in 4He by a Heat Flow |
| YIN Liang1, LIN Peng2, QI Xin1** |
1School of Science, Beijing University of Chemical Technology, Beijing 100029
2Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190
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| Cite this article: |
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YIN Liang, LIN Peng, QI Xin 2014 Chin. Phys. Lett. 31 114401 |
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Abstract The depression of the superfluid transition temperature in He by a heat flow Q is studied. A small sealed cell with a capillary is introduced and a stable and flat superfluid transition temperature plateau is easily obtained by controlling the temperature of the variable-temperature platform and the bottom chamber of the sealed cell. Owing to the depression effect of the superfluid transition temperature by the heat flow, the heat flow through the capillary is changed by the temperature control to obtain multiple temperature plateaus of different heat flows. The thermometer self-heating effect, the residual heat leak of the 4.2 K environment, the temperature difference on the He II liquid column, the Kapiza thermal resistance between the liquid helium and the copper surface of the sealed cell, the temperature gradient of the sealed cell, the static pressure of the He II liquid column and other factors have influence on the depression effect and the influence is analyzed in detail. Twenty experiments of the depression of the superfluid transition temperature in 4He by heat flow are made with four sealed cells in one year. The formula of the superfluid transition temperature pressured by the heat flow is Tλ(Q)=?0.00000103Q+2.1769108, and covers the range 229≤Q≤6462 μW/cm2.
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Published: 28 November 2014
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| PACS: |
44.20.+b
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(Boundary layer heat flow)
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44.35.+c
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(Heat flow in multiphase systems)
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44.90.+c
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(Other topics in heat transfer)
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