Convective heat transport in two-phase superfluid/vapor 4He system

0496307 - ÚPT 2019 RIV US eng J - Článek v odborném periodiku
Urban, Pavel - Hanzelka, Pavel - Vlček, Ivan - Schmoranzer, D. - Skrbek, L.
Convective heat transport in two-phase superfluid/vapor 4He system.
Low Temperature Physics. Roč. 44, č. 10 (2018), s. 1001-1004. ISSN 1063-777X. E-ISSN 1090-6517
Grant CEP: GA ČR(CZ) GA17-03572S; GA MŠMT(CZ) LO1212
Institucionální podpora: RVO:68081731
Klíčová slova: 4He * thermal convection * transport * two-fluid heat
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 0.825, rok: 2018

We have recently shown that under certain cryogenic conditions heat can flow from a colder but constantly heated body to a hotter but constantly cooled body. Specifically, we have provided experimental evidence that heat flows through normal liquid and gaseous phases of4He from the constantly heated, but cooler, bottom plate of a Rayleigh-Bénard convection cell to its hotter, but constantly cooled, top plate. Here we report results of a modified experiment, where the bottom normal liquid helium layer is replaced by superfluid4He, providing, together with a superfluid film covering the entire cell interior, an effective thermal short-circuit. Applied heat input of order 1 W to the bottom plate results in simultaneous heating of the entire cell: this physical process can be viewed, at least approximately, as a series of subsequent equilibrium states, until upon reaching the superfluid transition the non-equilibrium processes described in our previous study [Proc. Nat. Acad. Sci. USA 110, 8036 (2013)] are fully recovered.
Trvalý link: http://hdl.handle.net/11104/0289124