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

R. Verzicco, K. R. Sreenivasan

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Pages (from-to)203-219
Number of pages17
JournalJournal of Fluid Mechanics
Volume595
DOIs
StatePublished - Jan 25 2008

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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