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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study of forced convective heat transfer in grille-particle composite packed beds
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Experimental study of forced convective heat transfer in grille-particle composite packed beds

机译：格栅-颗粒复合填料床中强迫对流换热的实验研究

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摘要

Due to high surface area-to-volume ratio and superior thermal performance, packed beds are widely used in variety of industries. In the present study, forced convective heat transfer in a novel grille-particle composite packing (GPCP) bed, was experimentally investigated in pursuit of reduced pressure drop and enhanced overall heat transfer. The effects of sub-channel to particle diameter ratio, grille thickness and grille thermal conductivity on pressure drop, Nusselt number and overall heat transfer efficiency in the grille-particle channel were carefully analyzed. And performances of grille-particle channels were compared with those of random particle channels in detail. It is shown that looser packing structure compromises heat transfer in the grille-particle channel, while decreasing pressure drop and improving overall heat transfer efficiency. Meanwhile, for the same Reynolds number and particle diameter, higher grille thermal conductivity and thinner grille thickness also improve overall heat transfer performance. Finally, when compared with random packing, both pressure drop and heat transfer in grille-particle channels are shown to be reduced, while overall heat transfer efficiency is improved, especially when employing relatively small particle diameters. (C) 2018 Elsevier Ltd. All rights reserved.
机译：由于高的体积比和出色的热性能，填充床被广泛用于各种行业。在本研究中，为追求降低压降和增强整体传热的目的，对新型格栅-颗粒复合填料（GPCP）床中的强制对流传热进行了实验研究。仔细分析了子通道与粒径比，格栅厚度和格栅热导率对格栅-颗粒通道中压降，努塞尔数和总传热效率的影响。并详细比较了格栅颗粒通道和随机颗粒通道的性能。结果表明，较松散的填料结构损害了格栅-颗粒通道中的传热，同时降低了压降并提高了总体传热效率。同时，对于相同的雷诺数和粒径，较高的格栅导热系数和较薄的格栅厚度也可改善整体传热性能。最后，当与无规填料相比时，格栅颗粒通道中的压降和传热均被降低，同时整体传热效率得到了改善，尤其是当采用相对较小的粒径时。 （C）2018 Elsevier Ltd.保留所有权利。

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