SAAD M.J. AL-AZAWI
Abstract
Experimental investigation was carried out to study the effect of a hollow and inclination angles on the ability of a square flat plate squander the convective heat transfer. An experimental ...
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Experimental investigation was carried out to study the effect of a hollow and inclination angles on the ability of a square flat plate squander the convective heat transfer. An experimental set-up of an uniformly heated Aluminum flat plate of a centerial hollow representing 0.25 of the entire surface area of the plate heated by a constant heat flux was used basically for this purpose. Experiments were performed for inclination angles of (0o,15o, 30o, 45o, 60o,75o, 90o)for a region of Rayleigh number between ( 151550-1616000).This study showed that the ability of the surface to dissipate heat was presented by the average Nusselt number as a function of Rayleigh number depending on the existence of the hollow and the inclination angle. The existing of the hollow increased the value of average Nusselt number up to (39%) in the horizontal state and change sequentially with the inclination angle and it reached the maximum value of (48%) at the angle (75o) and (22%) as a average for all the inclination angles under test as compared with the horizontal state of the present hollow surface and reached (59%) with the unhollow inclination surfaces.
