We numerically investigate turbulent thermal convection driven by a horizontal surface of constant heat flux and compare the results with those of constant temperature. Below Ra ≈ 109, where Ra is the Rayleigh number, when the flow is smooth and regular, the heat transport in the two cases is essentially the same. For Ra > 10^9 the heat transport for imposed heat flux is smaller than that for constant temperature, and is close to experimental data. We provide a simple dimensional argument to indicate that the unsteady emission of thermal plumes renders typical experimental conditions closer to the constant heat flux case.

Verzicco, R., Sreenivasan, K. (2008). A comparison of turbulent thermal convection between conditions of constant temperature and constant heat flux. JOURNAL OF FLUID MECHANICS, 595, 203-219 [10.1017/S0022112007009135].

A comparison of turbulent thermal convection between conditions of constant temperature and constant heat flux

VERZICCO, ROBERTO;
2008

Abstract

We numerically investigate turbulent thermal convection driven by a horizontal surface of constant heat flux and compare the results with those of constant temperature. Below Ra ≈ 109, where Ra is the Rayleigh number, when the flow is smooth and regular, the heat transport in the two cases is essentially the same. For Ra > 10^9 the heat transport for imposed heat flux is smaller than that for constant temperature, and is close to experimental data. We provide a simple dimensional argument to indicate that the unsteady emission of thermal plumes renders typical experimental conditions closer to the constant heat flux case.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore ING-IND/06 - Fluidodinamica
English
Con Impact Factor ISI
constant temperature boundary conditions, constant heat flux boundary conditions, turbulent heat transfer
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=1624256
Verzicco, R., Sreenivasan, K. (2008). A comparison of turbulent thermal convection between conditions of constant temperature and constant heat flux. JOURNAL OF FLUID MECHANICS, 595, 203-219 [10.1017/S0022112007009135].
Verzicco, R; Sreenivasan, K
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/52748
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