Local wall heat flux in confined thermal convection

Local wall heat flux in confined thermal convection

We report highly resolved measurements of the local wall heat flux in turbulent Rayleigh–Bénard convection using an infrared camera. The measurements have been undertaken in a Rayleigh–Bénard cell with rectangular base of 2.50m×0.65m and a height of 2.5m which is filled with air. First of all, it co...

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Veröffentlicht in:International journal of heat and mass transfer 2014-06, Vol.73, p.752-760
Hauptverfasser: Kaiser, Robert, du Puits, Ronald
Format: Artikel
Sprache:eng
Schlagworte:
Convection
Cross sections
Fluid dynamics
Heat flux
Heat transfer
Infrared thermography
Mass transfer
Rayleigh–Bénard convection
Turbulence
Two-dimensional heat flux
Walls
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Zusammenfassung:We report highly resolved measurements of the local wall heat flux in turbulent Rayleigh–Bénard convection using an infrared camera. The measurements have been undertaken in a Rayleigh–Bénard cell with rectangular base of 2.50m×0.65m and a height of 2.5m which is filled with air. First of all, it could be demonstrated that in a Rayleigh–Bénard cell with rectangular cross-section the time-averaged wall heat flux locally deviates by 30% from its mean. Furthermore, a strong correlation between the global flow structure inside the cell and the distribution of the local wall heat flux could be identified.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2014.02.033