A borescopic technique was used for finding the effect of pressure on the hydrodynamics of gas‐solid fluidized beds. The results showed that solids radial distribution may become more or less uniform with increasing pressure depending on the superficial gas velocity. Moreover, it is found that the solids volume fraction of the emulsion phase may decrease at relatively high pressures, only in the central region of the bed. Additionally, it is observed that with increasing pressure the bubble size generally decreased in the central regions and increased near the wall regions. This trend was more complicated at low excess gas velocities. The number of bubbles increased for the central regions and near the walls for all the performed experiments. However, this parameter showed a different trend at other radial positions. © 2018 The Authors AIChE Journal published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers AIChE J, 64: 3303–3311, 2018

中文翻译：

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加压气固流化床中的孔镜检查

使用管道镜技术来发现压力对气固流化床流体力学的影响。结果表明，取决于表观气体速度，固体径向分布可能随着压力的增加而变得大致均匀。此外，发现乳液相的固体体积分数可能仅在床的中心区域中在相对高的压力下降低。另外，观察到，随着压力的增加，气泡的大小通常在中心区域减小，而在壁区域附近增大。在低过剩气体速度下，这种趋势更加复杂。对于所有进行的实验，气泡的数量在中心区域和壁附近增加。但是，该参数在其他径向位置显示出不同的趋势。AIChE J，64：3303–3311，2018