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

Published online by Cambridge University Press:  08 January 2008

R. VERZICCO  and
K. R. SREENIVASAN
R. VERZICCO
Affiliation:
Politecnico di Bari, DIMeG and CEMeC, Via Re David 200, 70125, Bari, Italia
K. R. SREENIVASAN
Affiliation:
International Centre for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy
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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 > 109 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.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 595 , 25 January 2008 , pp. 203 - 219
Copyright
Copyright © Cambridge University Press 2008

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