An Experimental Approach For A Fine Visualisation Real-Time Of The Thermal Boundary Layer To The Top Of A Grooved Disc

 This study is based on the design and use of an experimental set-up dedicated to make visible and treat the thermal boundary layer above a heated horizontal grooved disk in ambient air. The shadowgraph technique is used in order to visualize the flow and get quantitative data. On the one hand a remotely controllable camera, installed carefully on a rail which maintains the camera with a meticulous position compared to the screen, enabled us to carry out sockets of sight in the vicinity immediate of the interface. In addition we quantified the vertical gradients of the temperature in the viscous sublayer, with less few pixels of the upper surface of the disc thanks to a system of image processing. The results present a fine description of the evolution local structure of the flow along the convection since the viscous sublayer until the limits of the turbulent boundary layer.