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
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.