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Change in flow regime in a natural convection flow in an open-ended vertical channel

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1010
pages 950-961

Christophe Daverat
Universite de Lyon, CNRS, France; INSA-Lyon, CETHIL

Hervé Pabiou
Univ Lyon, CNRS, INSA-Lyon, Universite Claude Bernard Lyon 1, CETHIL UMR5008, F-69621, Villeurbanne, France

Hassan Bouia
Electcité de France R&D, Département EnerBAT, Les Renardières, Avenue des Renardières, BP 46, F77818, MORET-sur-LOING Cedex, FRANCE

Shihe Xin
Univ Lyon, CNRS, INSA-Lyon, Universite Claude Bernard Lyon 1, CETHIL UMR5008, F-69621, Villeurbanne, France

Christophe Menezo
Universite de Lyon, CNRS, France ; Chaire INSA-EDF Habitats et Innovations Energetiques, CETHIL, UMR5008, F-69621, Villeurbanne, France; University Savoie Mont-Blanc, LOCIE UMR CNRS 5271, Campus Scientifique Savoie Technolac − F- 73376, Le Bourget-du-Lac, France

Sinopsis

The behaviour of a natural convection flow in a vertical channel with wall heating is analyzed by using a water-filled experimental setup. The experimental channel is described and the boundary conditions are characterized in detail. The main result concerns the observation of a change in the flow regime that can be seen on the mean velocity profiles. Using the profiles of the fluctuating quantities, we show that below the transition, turbulence is due to global shear forced by the constant wall heat flux condition. After the transition, turbulence is maintained by more efficient heat transport that transfers the thermal energy from the wall to the fluid close to the wall.

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