Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7060929 | International Journal of Thermal Sciences | 2017 | 9 Pages |
Abstract
This experimental study deals with natural convection flow in a water channel with a symmetrical isoflux wall heating. Wall temperature, velocity, bulk temperature and fluctuating quantities are measured for a modified Rayleigh number Raâ=6.7Ã107. The analysis of the mean values shows a change of behaviour at the two-third of the height of the channel. This change turns out to be a transition from a laminar heat transfer in the bottom part of the channel to a turbulent one in the upper part. Due to isoflux wall boundary conditions, shear layers develop and thicken in each half-channel. It is shown that the meeting of these layers at the centre of the channel triggers the transition from a laminar heat transfer to a turbulent one. This experimental study is followed by a scaling analysis [1].
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Christophe Daverat, Yiqin Li, Hervé Pabiou, Christophe Ménézo, Shihe Xin,