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Effect of swirl generators with different sized propeller on heat transfer enhancement

机译：螺旋桨大小不同的旋流发生器对强化传热的影响

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摘要

In this study, the swirl flow that is one of the passive methods is used for increasing the heat transfer coefficient in the concentric heat exchangers. For this purpose, propeller type swirl generators were prepared to test in the experiments. So, the effect of propellers placed in the inner pipe of the concentric heat exchangers on the heat transfer and pressure drop was investigated experimentally. Experiments were undertaken for the Reynolds Number range of 4000-12000 and for both parallel and counter-flow. It is shown that, the propellers rotated freely with the effect of fluid flowed in the inner pipe are swirling flow generator and they have improved heat transfer. In addition that up to 50% enhancements could be accomplished in heat transfer rates with the swirl generators compared to without the swirl generators. In the parallel flow mode, the enhancement was 10 % lower than that of counter-flow at the same Reynolds number. On the other hand the pressure losses increase approximately 3 times more than the empty tube related to Reynolds numbers and propeller sizes. As an outcome of the study, the results showed that a rather smaller size but the same capacity heat exchanger could be proposed by using these elements imposing swirling to the fluid flowing through inner pipe.
机译：在这项研究中，作为被动方法之一的旋流被用于增加同心热交换器中的传热系数。为此，准备了螺旋桨式涡流发生器以在实验中进行测试。因此，实验研究了放置在同心换热器内管中的螺旋桨对传热和压降的影响。对雷诺数范围为4000-12000以及平行流和逆流进行了实验。结果表明，在内管中流动的流体作用下自由旋转的螺旋桨是涡流发生器，它们的传热性得到了改善。此外，与没有涡流发生器的情况相比，使用涡流发生器的传热速率最多可提高50％。在平行流模式下，相同雷诺数下的增强比逆流增强低10％。另一方面，与雷诺数和螺旋桨尺寸有关的空管压力损失增加了大约三倍。作为研究的结果，结果表明，通过使用对流经内管的流体进行旋流的这些元件，可以提出尺寸较小但容量相同的热交换器。

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