Abstract
This paper treats experimental investigation about natural convection induced by the flow of fluid inside vertical channel corresponds to vertical double skin façades with integration of PV panels and inclined channel corresponds to roof-top ones. The system is modeled by a vertical and inclined channel asymmetrically heated with uniform heat fluxes at 27W/m2, 445W/m2 and 1550W/m2 corresponding to three modified Rayleigh numbers (Ra∗=1.32×105, 2.19×106 and 7.63×106). The flow dynamics were characterized using visualization by PIV technique. The analysis focused more specifically on the influence of the modified Rayleigh number (Ra∗) and the channel inclination angle during the early stage regime on the flow structure. The study of the streamlines shows the appearance of a large-scale flow which develops until the appearance of a big vortex (reversed flow) attached to the adiabatic wall. Also, it is shown that the flow is influenced by the modified Rayleigh number and the inclination angle, the shifting of the recirculation zone towards the heated wall and the reductions in the thickness of the boundary layer are noticed. Velocity profiles at entrance and exit of the channel are also analyzed and discussed.
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