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首页> 外文期刊>International Journal of Heat and Mass Transfer >Enhancement of forced convection in wide cylindrical annular channel using rotating inner pipe with interrupted helical fins
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Enhancement of forced convection in wide cylindrical annular channel using rotating inner pipe with interrupted helical fins

机译：带有螺旋鳍的旋转内管增强宽圆柱环形通道中的对流

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摘要

This paper presents the results of heat transfer and pressure drop in concentric annular wide channel with inner plain or finned pipe under stationary and rotating conditions in Taylor-Couette-Poiseuille flow. The experiments are conducted for one plain pipe and three finned pipes with helical fin spacing of 75,110 and 150 mm at rotating speeds of 0, 200, 250, 300, 350 and 400 rpm. The experiments cover axial Reynolds number of 8.07 × 10~4-1.82 × 10~5, rotational Reynolds number of 0 and from 1428 to 3008, corresponds to Taylor number of 0 and from 1.22 × 10~6 to 8.32 × 10~6. The reported results in the form of Nusselt numbers and friction factors are correlated in terms of Re, Ta, Pr and fin geometrical parameters. The results proved that at Re = 1.5 × 10~5, the wide annular channel with inner pipe of helical fin spacing 75 mm that rotates at 400 rpm enhances Nu by a factor of 7.5 and also boosts the ratio of heat exchange to pumping power by a factor of 7.6, compared to the case for plain stationary pipe.
机译：本文介绍了在泰勒-库埃特-泊瓦伊流中的固定和旋转条件下，带内平管或翅片管的同心环形宽通道内的传热和压降的结果。对一根普通管和三根翅片管进行实验，这些翅片管的螺旋翅片间距分别为75,110和150 mm，转速分别为0、200、250、300、350和400 rpm。实验覆盖轴向雷诺数为8.07×10〜4-1.82×10〜5，旋转雷诺数为0，从1428至3008，相当于泰勒数为0，从1.22×10〜6至8.32×10〜6。以Nusselt数和摩擦系数形式报告的结果在Re，Ta，Pr和鳍的几何参数方面相互关联。结果证明，在Re = 1.5×10〜5时，螺旋翅片间距为75 mm的内管的宽环形通道以400 rpm的转速旋转，使Nu增加7.5倍，并且还提高了换热与泵送功率的比值。与普通固定管的情况相比，系数是7.6。

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