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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experiments on the local heat transfer characteristics of a circulating fluidized bed
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Experiments on the local heat transfer characteristics of a circulating fluidized bed

机译：循环流化床局部传热特性的实验

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The role of particle diameter in the heat transfer of a gas-solid suspension to the walls of a circulating fluidized bed was studied for particles of uniform size. This work reports and analyzes new experimental results for the local bed to wall heat transfer coefficient. not including the radiation component, in a long active heat transfer surface length laboratory bed, which extend previous findings and clear up some divergences. The research included determining the effects of extension and location of the heat transfer surface. circulating solids mass flux and average suspension density. An experimental set-up was built, with a 72.5 mm internal diameter riser. 6.0 m high, composed of six double pipe heat exchangers, 0.93 m high, located one above the other. Five narrow sized diameter quartz sand particles - 179. 230, 385. 460 and 545 mu m - were tested. Temperature was kept approximately constant at 423 K and the superficial gas velocity at 10.5 m/s. The major influence of suspension density on the wall heat transfer was confirmed, and contrary to other authors. a significant effect of particle size was found. which becomes more relevant for smaller particles and increasing suspension density. It was observed that the extension of the heat transfer surface area did not influence the heat transfer coefficient for lengths greater than 0.93 m. The heat transfer surface location did not show any effect, except fur the exchanger at the botton of the riser. A simple correlation was proposed to calculate the heat transfer coefficient as a function of particle diameter and suspension density. (C) 2000 Elsevier Science Inc. All rights reserved. [References: 22]
机译：对于均匀尺寸的颗粒，研究了粒径在气固悬浮液向循环流化床壁的传热中的作用。这项工作报告和分析了新的实验结果为本地床到墙的传热系数。在长有效传热表面长度的实验室床上不包括辐射成分，这扩展了以前的发现并消除了一些分歧。研究包括确定传热表面的延伸和位置的影响。循环固体质量通量和平均悬浮液密度。建立了一个具有72.5 mm内径立管的实验装置。高6.0 m，由六个高0.93 m的双管热交换器组成，一个位于另一个上方。测试了五个直径狭窄的石英砂颗粒-179、230、385、460和545微米。温度大致保持恒定在423 K，表观气体速度保持在10.5 m / s。证实了悬浮液密度对壁传热的主要影响，这与其他作者相反。发现粒径的显着影响。这对于较小的颗粒和增加的悬浮液密度变得更加重要。观察到，对于大于0.93m的长度，传热表面积的扩展不影响传热系数。传热表面的位置没有任何影响，除了在立管底部的交换器。提出了一种简单的相关性，以计算传热系数与粒径和悬浮液密度的关系。 （C）2000 Elsevier Science Inc.保留所有权利。 [参考：22]

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