Boundary effects near the superfluid transition (BEST), an experiment proposed for the ISS

Ahlers, Guenter; Finley, Paul; Genio, Edgar; Kuehn, Kerry; Liu, Feng-Chuan; Liu, Yuan-Ming; Mehta, Sarabjit; Murphy, Daniel
January 2000
AIP Conference Proceedings;2000, Vol. 504 Issue 1, p662
Academic Journal
We review the opportunities for microgravity measurements of the thermal resistivity R(L,t) near the bulk superfluid-transition line T[sub λ](P) of [sup 4]He confined in cylindrical geometries with axial heat flow. A scaling function is used to estimate R as a function of the cylinder radius L and of the pressure P. These predictions are used to assess the effect of gravity on potential Earth-based measurements. Radii L>=8 μm can only be investigated fully in micro-gravity. At higher pressures the gravity effect is larger. At 30 bar samples with L>=4 μm require microgravity. Modern thermometry has sufficient resolution to permit quantitative measurements of the finite-size effect for L as large as 50 μm, the size chosen for the proposed ISS experiment BEST. © 2000 American Institute of Physics.


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