Anomalous heat transport and condensation in convection of cryogenic helium

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F13%3A10173323" target="_blank" >RIV/00216208:11320/13:10173323 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68081731:_____/13:00397714

Výsledek na webu

<a href="http://dx.doi.org/10.1073/pnas.1303996110" target="_blank" >http://dx.doi.org/10.1073/pnas.1303996110</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1073/pnas.1303996110" target="_blank" >10.1073/pnas.1303996110</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Anomalous heat transport and condensation in convection of cryogenic helium

Popis výsledku v původním jazyce

When a hot body A is thermally connected to a cold body B, the textbook knowledge is that heat flows from A to B. Here, we describe the opposite case in which heat flows from a colder but constantly heated body B to a hotter but constantly cooled body Athrough a two-phase liquid-vapor system. Specifically, we provide experimental evidence that heat flows through liquid and vapor phases of cryogenic helium from the constantly heated, but cooler, bottom plate of a Rayleigh-Benard convection cell to its hotter, but constantly cooled, top plate. The bottom plate is heated uniformly, and the top plate is cooled by heat exchange with liquid helium maintained at 4.2 K. Additionally, for certain experimental conditions, a rain of helium droplets is detected by small sensors placed in the cell at about one-half of its height.

Název v anglickém jazyce

Anomalous heat transport and condensation in convection of cryogenic helium

Popis výsledku anglicky

When a hot body A is thermally connected to a cold body B, the textbook knowledge is that heat flows from A to B. Here, we describe the opposite case in which heat flows from a colder but constantly heated body B to a hotter but constantly cooled body Athrough a two-phase liquid-vapor system. Specifically, we provide experimental evidence that heat flows through liquid and vapor phases of cryogenic helium from the constantly heated, but cooler, bottom plate of a Rayleigh-Benard convection cell to its hotter, but constantly cooled, top plate. The bottom plate is heated uniformly, and the top plate is cooled by heat exchange with liquid helium maintained at 4.2 K. Additionally, for certain experimental conditions, a rain of helium droplets is detected by small sensors placed in the cell at about one-half of its height.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

<a href="/cs/project/GPP203%2F12%2FP897" target="_blank" >GPP203/12/P897: Rayleigh-Bénardova konvekce za kryogenních teplot pro Rayleigho čísla Ra > 1e11</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2013

Kód důvěrnosti údajů

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

Název periodika

Proceedings of the National Academy of Sciences of the United States of America

ISSN

0027-8424

e-ISSN

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Svazek periodika

110

Číslo periodika v rámci svazku

20

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

4

Strana od-do

8036-8039

Kód UT WoS článku

000319803500023

EID výsledku v databázi Scopus

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