Article ID Journal Published Year Pages File Type
7060929 International Journal of Thermal Sciences 2017 9 Pages PDF
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 Ra∗=6.7×107. 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
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