Experimental Investigation of Mixed Laminar Convection in the Entrance Region of Inclined Rectangular Channels

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Abstract
The present experimental study considers the effect of combined forced and free laminar convection on the heat transfer in the entrance region of horizontal and inclined rectangular channels under uniform wall heat flux. The test facility includes electrically heated aluminum rectangular channels having aspect ratios AR = 2.667 and 0.375, with water as the working fluid. The experimental results included the circumferential wall temperature distribution and the axial variation of Nusselt number. Correlations of the experimental results of Nusselt number in the fully developed region were obtained in terms of Rayleigh number, Reynolds number, and inclination angle.

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