### 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 ≈ 10^{9}, 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.

Original language | English (US) |
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Pages (from-to) | 203-219 |

Number of pages | 17 |

Journal | Journal of Fluid Mechanics |

Volume | 595 |

DOIs | |

State | Published - Jan 25 2008 |

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### ASJC Scopus subject areas

- Computational Mechanics
- Mechanics of Materials
- Physics and Astronomy(all)
- Condensed Matter Physics

### Cite this

**A comparison of turbulent thermal convection between conditions of constant temperature and constant heat flux.** / Verzicco, R.; Sreenivasan, K. R.

Research output: Contribution to journal › Article

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TY - JOUR

T1 - A comparison of turbulent thermal convection between conditions of constant temperature and constant heat flux

AU - Verzicco, R.

AU - Sreenivasan, K. R.

PY - 2008/1/25

Y1 - 2008/1/25

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=38049110148&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=38049110148&partnerID=8YFLogxK

U2 - 10.1017/S0022112007009135

DO - 10.1017/S0022112007009135

M3 - Article

VL - 595

SP - 203

EP - 219

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

ER -