Abstract
An experimental and numerical investigation has been conducted to clarify the effect of angle of attack on heat transfer characteristics around a single drop-shaped tube. The Reynolds number for the flow was varied from 21.8 × 103 to 42.3 × 103. Twelve flow angles of attack (θ=0°∼50° and 130°∼180°) were considered. The results of the drop-shaped tube were compared with those of a circular tube having the same equivalent diameter. Three methods of thermal evaluation criteria were discussed. Correlations for the average Nusselt number and the effectiveness for the drop-shaped tube in terms of Reynolds number, Prandtl number, and the angle of attack were obtained. The results indicated that the drop-shaped tube at θ=50° enhances the heat transfer considerably. The best effectiveness values were achieved at θ= 0°, and 180°, which were about 8.16–8.67, and 6.43–8.08 times, respectively, greater than those obtained for the circular tube. The highest values of the area goodness factor were occurred at θ = 170°, which were higher than those obtained for the circular tube by about 437–677%. In addition, the drop-shaped tube contributes greatly to energy conservation.
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