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- 2016
不同堆积结构颗粒床内的流动特性研究
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Abstract:
为了研究不同堆积结构颗粒床内的流动特性,使用两种尺寸球形颗粒构建了均匀混合堆积结构和分层堆积结构床,在碎片床冷却性实验装置(DEBECO,DEbris BEd COolability)上进行了单相和两相流动实验。基于实验结果,对比分析了两种堆积结构的流动阻力压降,进一步验证了流动阻力模型。实验结果表明:对于不同尺寸颗粒均匀混合的堆积颗粒床,其有效直径在低速(Rep<7)条件下更接近面积平均直径;随着速度(Rep>7)升高,其有效直径更接近长度平均直径。当气液两相同向向上流过均匀堆积结构颗粒床时,实验测量的两相压降总体上与Reed模型预测值较为接近;与均匀堆积结构床相比,相同颗粒分层堆积结构床内的两相流动阻力压降较低。该实验研究结果对完善多孔介质结构内流动阻力分析具有重要的学术意义。
To investigate the flow characteristics in particulate beds with different packing structures, the experiments on flow characteristics of particulate homogeneous and stratified beds consisting of two kinds of spherical particles were performed on the test facility of DEBECO (DEbris BEd COolability). Based on the experimental results, the pressure drops were compared and analyzed, and the flow resistance models were further verified. The experimental results showed that the effective diameter is closer to the area mean diameter at low flow rates (Rep<7) for a bed packed with uniform mixture of particles, but more closer to the length mean diameter with increasing flow rates (Rep>7). For gas？？water cocurrent flow through a homogeneous bed, the predictions of Reed’s model were more comparable with the measured pressure drops. Compared with the homogeneous bed filled with the same particles, the stratified bed showed a lower flow resistance. The experimental results may contribute to the analysis of flow resistance in porous media
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