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首页> 外文会议>2002 ASME International Mechanical Engineering Congress and Exposition , Nov 17-22, 2002, New Orleans, Louisiana >AN EXPERIMENTAL STUDY OF LOCAL HEAT TRANSFER DISTRIBUTION BETWEEN BLOCKAGES WITH HOLES IN A RECTANGULAR CHANNEL
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AN EXPERIMENTAL STUDY OF LOCAL HEAT TRANSFER DISTRIBUTION BETWEEN BLOCKAGES WITH HOLES IN A RECTANGULAR CHANNEL

机译：矩形通道内孔与孔之间局部传热分布的实验研究

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摘要

Experiments have been conducted to study heat transfer between two blockages with holes and pressure drop across the blockages, for turbulent flow in a rectangular channel. Average heat transfer coefficient and local heat transfer distribution on one of the channel walls between two blockages, and overall pressure drop across the blockages were obtained, for nine different staggered arrays of holes in the blockages and Reynolds numbers of 10,000 and 30,000. For the hole configurations studied, the blockages enhanced heat transfer by 4.6 to 8.1 times, but significantly increased the pressure drop. Smaller holes in the blockages caused higher heat transfer enhancement, but larger increase of the pressure drop than larger holes. The heat transfer enhancement was lower in the higher Reynolds number cases. Because of the large pressure drop, the heat transfer per unit pumping power was lower with the blockages than without the blockages. The local heat transfer was lower nearer the upstream blockage, the highest near the downstream blockage, and also relatively high in regions of reattachment of the jets leaving the upstream holes. The local heat transfer distribution was strongly dependent on the configuration of the hole array in the blockages. A third upstream blockage lowered both the heat transfer and the pressure drop, and significantly changed the local heat transfer distribution.
机译：为了研究矩形通道中的湍流，已经进行了实验来研究两个带有孔的堵塞物之间的传热和穿过堵塞物的压降。对于在堵塞物中的九个不同的交错孔阵列和10,000和30,000的雷诺数，获得了两个堵塞物之间通道壁之一上的平均传热系数和局部传热分布以及整个堵塞物的压降。对于所研究的孔结构，堵塞将传热提高了4.6到8.1倍，但显着增加了压降。堵塞物中的孔越小，传热效果越好，但与较大的孔相比，压降的增加幅度更大。在较高的雷诺数情况下，传热增强较低。由于大的压降，有堵塞的情况下每单位泵送功率的传热要比没有堵塞的情况下低。在上游堵塞附近，局部传热较低，在下游堵塞附近，局部传热最高，并且在离开上游孔的射流的重新附着区域中，局部传热也较高。局部传热分布在很大程度上取决于堵塞物中孔阵列的构型。第三次上游堵塞降低了传热和压降，并显着改变了局部传热分布。

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