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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

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

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

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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