المجلة الدولية للعلوم والتقنية

The effects of thermal results of turbulent natural convection with the interaction of surface radiation in a rectangular enclosure have previously been numerically and experimentally studied by the authors. This work extends these results by comparing the provided numerical profiles with the experimental results. In this research an experimental study were performed for a hot wall temperatures ranging from 50C° to 75C° with an increment of 5C° with almost constant cold wall temperature at about 9°C and for three enclosure sizes of aspect ratios 2.0, 1.0 and 0.5. In this study the laser Doppler velocimetry has been used to collect the velocity profiles inside the enclosure. 3D numerical calculations were performed using the ANSYS 13 workbench software and for the same range of parameters of the experimental study. The velocity profiles at the hot wall side and at the enclosure core for numerical and experimental results are in good agreement with each other. The velocity reversals were noticed to happen above 65% of the enclosure height.