Modulated turbulent convection: a benchmark model for large scale natural flows driven by diurnal heating

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F24%3A00587692" target="_blank" >RIV/68081731:_____/24:00587692 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11320/24:10494313

Výsledek na webu

<a href="https://www.nature.com/articles/s41598-024-66882-5" target="_blank" >https://www.nature.com/articles/s41598-024-66882-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1038/s41598-024-66882-5" target="_blank" >10.1038/s41598-024-66882-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Modulated turbulent convection: a benchmark model for large scale natural flows driven by diurnal heating

Popis výsledku v původním jazyce

Our life is strongly affected by turbulent convective flows, driven by time-dependent thermal forcing, especially diurnal heating of the Earth’s surface by the Sun. In a laboratory experiment, we investigate their analogues: We study complex and extraordinary properties of turbulent buoyancy driven flows generated due to periodic modulation of the temperature of the plates of a Rayleigh–Bénard cell, with amplitudes both smaller and larger than either the positive or negative mean temperature difference between the top and bottom. We probe the turbulent flow of our working fluid – cryogenic helium gas – using temperature sensors placed in the cell interior and embedded in its plates. We discuss spatial and temporal structure of the heat flow, generalize validity of Nusselt versus Rayleigh number scaling Nu ∝ Raγ with γ≈1/3 at very high Ra for modulated convection and argue that this system represents a benchmark model which helps us understand the energy budget of ocean currents or weather formation on Earth subject to diurnal Sun heating as well as similar natural flows on Earth-like planets.

Název v anglickém jazyce

Modulated turbulent convection: a benchmark model for large scale natural flows driven by diurnal heating

Popis výsledku anglicky

Our life is strongly affected by turbulent convective flows, driven by time-dependent thermal forcing, especially diurnal heating of the Earth’s surface by the Sun. In a laboratory experiment, we investigate their analogues: We study complex and extraordinary properties of turbulent buoyancy driven flows generated due to periodic modulation of the temperature of the plates of a Rayleigh–Bénard cell, with amplitudes both smaller and larger than either the positive or negative mean temperature difference between the top and bottom. We probe the turbulent flow of our working fluid – cryogenic helium gas – using temperature sensors placed in the cell interior and embedded in its plates. We discuss spatial and temporal structure of the heat flow, generalize validity of Nusselt versus Rayleigh number scaling Nu ∝ Raγ with γ≈1/3 at very high Ra for modulated convection and argue that this system represents a benchmark model which helps us understand the energy budget of ocean currents or weather formation on Earth subject to diurnal Sun heating as well as similar natural flows on Earth-like planets.

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/GC21-06012J" target="_blank" >GC21-06012J: Efekty narušení Oberbeck-Boussinesquovy aproximace v turbulentní konvekci za vysokých Rayleighových čísel v kryogenním héliu</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

Scientific Reports

ISSN

2045-2322

e-ISSN

2045-2322

Svazek periodika

14

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

9

Strana od-do

15987

Kód UT WoS článku

001270506400049

EID výsledku v databázi Scopus

2-s2.0-85198052955