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Experimental measurements of gas pressure drop of packed pebble beds
Fusion Engineering and Design ( IF 1.7 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.fusengdes.2020.111836
Maulik Panchal , Abhishek Saraswat , Paritosh Chaudhuri

Abstract The nearly spherical shaped ceramic pebble beds in the breeder blanket of the future fusion reactor are purged by low-pressure gas to channelize the produced tritium fuel into the tritium extraction system. The required pumping power for the flowing gas in pebble beds can be estimated using the pressure drop across the pebble beds. The aim of this work is to measure the gas pressure drop experimentally across packed pebble beds as a function of pebble sizes, pebble shapes, pebble materials, and gas velocity. The pebble beds are packed in a cylindrical-shaped stainless steel container with an inner diameter of 24 mm and a length of 130 mm. The various experiments have been performed on stainless steel spheres (Diameter: 1 mm, 2 mm, 3 mm, and 4 mm), alumina pebbles (Mean diameter: 1 mm and 1.5 mm), and lithium meta-titanate pebbles (Mean diameter: 1 mm and 1.3 mm). The gas flow has been controlled and measured using a digital mass flow controller. The static differential pressure across the pebble beds has been monitored by a differential pressure transducer. The pressure drop significantly increases with a decrease in the diameter of pebbles/spheres and an increase in the packing fraction of the bed. The material type does not affect the results which are too obvious for the fixed pebble bed which is considered in these experiments. The obtained experimental results of gas pressure drop have been compared and agreed well with the prediction of the Ergun’s correlation.

中文翻译:

填充卵石床气体压降的实验测量

摘要 未来聚变反应堆增殖层中近球形的陶瓷球床被低压气体吹扫,将产生的氚燃料引导到氚提取系统中。卵石床中流动气体所需的泵送功率可以使用卵石床的压降来估计。这项工作的目的是通过实验测量填充卵石床的气压降,作为卵石尺寸、卵石形状、卵石材料和气体速度的函数。卵石床装在一个内径为 24 毫米、长度为 130 毫米的圆柱形不锈钢容器中。在不锈钢球(直径:1 毫米、2 毫米、3 毫米和 4 毫米)、氧化铝卵石(平均直径:1 毫米和 1.5 毫米)、和偏钛酸锂卵石(平均直径:1 毫米和 1.3 毫米)。气体流量已使用数字质量流量控制器进行控制和测量。跨卵石床的静态压差由压差传感器监测。随着卵石/球体直径的减小和床的填充率的增加,压降显着增加。对于这些实验中考虑的固定球床来说,材料类型不会影响太明显的结果。得到的气体压降实验结果与额尔古纳相关性的预测进行了比较,符合得很好。跨卵石床的静态压差由压差传感器监测。压降随着卵石/球体直径的减小和床的填充率的增加而显着增加。对于这些实验中考虑的固定球床来说,材料类型不会影响太明显的结果。得到的气体压降实验结果与额尔古纳相关性的预测进行了比较,符合得很好。跨卵石床的静态压差由压差传感器监测。压降随着卵石/球体直径的减小和床的填充率的增加而显着增加。对于这些实验中考虑的固定球床来说,材料类型不会影响太明显的结果。得到的气体压降实验结果与额尔古纳相关性的预测进行了比较,符合得很好。
更新日期:2020-11-01
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