Thermal radiation in Rayleigh-Benard convection experiments

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F20%3A00525160" target="_blank" >RIV/68081731:_____/20:00525160 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/20:10424145

Výsledek na webu

<a href="https://journals.aps.org/pre/abstract/10.1103/PhysRevE.101.043106" target="_blank" >https://journals.aps.org/pre/abstract/10.1103/PhysRevE.101.043106</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevE.101.043106" target="_blank" >10.1103/PhysRevE.101.043106</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal radiation in Rayleigh-Benard convection experiments

Popis výsledku v původním jazyce

An important question in turbulent Rayleigh-Benard convection (RBC) is the effectiveness of convective heat transport, which is conveniently described via the scaling of the Nusselt number (Nu) with the Rayleigh (Ra) and Prandtl (Pr) numbers. In RBC experiments, the heat supplied to the bottom plate is also partly transferred by thermal radiation. This heat transport channel, acting in parallel with the convective and conductive heat transport channels, is usually considered insignificant and thus neglected. Here we present a detailed analysis of conventional far-field as well as strongly enhanced near-field radiative heat transport occurring in various RBC experiments. A careful inclusion of the radiative transport appreciably changes the Nu = Nu(Ra) scaling inferred in turbulent RBC experiments near ambient temperature utilizing gaseous nitrogen and sulfur hexafluoride as working fluids. On the other hand, neither the conventional far-field radiation nor the strongly enhanced near-field radiative heat transport appreciably affects the heat transport law deduced in cryogenic helium RBC experiments.

Název v anglickém jazyce

Thermal radiation in Rayleigh-Benard convection experiments

Popis výsledku anglicky

An important question in turbulent Rayleigh-Benard convection (RBC) is the effectiveness of convective heat transport, which is conveniently described via the scaling of the Nusselt number (Nu) with the Rayleigh (Ra) and Prandtl (Pr) numbers. In RBC experiments, the heat supplied to the bottom plate is also partly transferred by thermal radiation. This heat transport channel, acting in parallel with the convective and conductive heat transport channels, is usually considered insignificant and thus neglected. Here we present a detailed analysis of conventional far-field as well as strongly enhanced near-field radiative heat transport occurring in various RBC experiments. A careful inclusion of the radiative transport appreciably changes the Nu = Nu(Ra) scaling inferred in turbulent RBC experiments near ambient temperature utilizing gaseous nitrogen and sulfur hexafluoride as working fluids. On the other hand, neither the conventional far-field radiation nor the strongly enhanced near-field radiative heat transport appreciably affects the heat transport law deduced in cryogenic helium RBC experiments.

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

<a href="/cs/project/GA20-00918S" target="_blank" >GA20-00918S: Souhra konvektivního přenosu tepla a turbulentních proudění s rotací v klasických a kvantových fázích kryogenního helia</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Physical Review E

ISSN

2470-0045

e-ISSN

—

Svazek periodika

101

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

043106

Kód UT WoS článku

000527130200003

EID výsledku v databázi Scopus

2-s2.0-85084548902