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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F18%3A00496307" target="_blank" >RIV/68081731:_____/18:00496307 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1063/1.5055836" target="_blank" >http://dx.doi.org/10.1063/1.5055836</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.5055836" target="_blank" >10.1063/1.5055836</a>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Low Temperature Physics

ISSN

1063-777X

e-ISSN

—

Svazek periodika

44

Číslo periodika v rámci svazku

10

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

4

Strana od-do

1001-1004

Kód UT WoS článku

000449060800004

EID výsledku v databázi Scopus

2-s2.0-85056256968