The hydrodynamic behavior of fluidized beds and the measurement of rheological parameters of fine powders (Group A and C in Geldart classification) were investigated. Seven powders ranging in size and density from 7 to 50 #mu#m and from 1600 to 5200 kg/m~3 respectively were used. For this set of experiments, the apparent minimum fluidization velocity (U_(mfa)) was measured and found to be 1 to 200 times greater than the minimum fluidization velocity estimated by correlation. The deviation shows an increase with respect to the degree of cohesiveness of fine particles. The latter parameter was quantified by measuring the Hausner index which reflects the cohesiveness of powers. During the course of both experiments, the effect of bed heterogeneous structure was highlighted using X-ray tomographic aalysis.
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机译：研究了流化床的流体动力学行为以及细粉（Geldart分类中的A组和C组）的流变参数的测量。使用了七种粉末，其大小和密度分别为7至50＃μm和1600至5200 kg / m〜3。对于这组实验，测量了表观最小流化速度（U_（mfa）），发现它比通过相关性估算的最小流化速度大1到200倍。偏差表明细颗粒的内聚度增加。后一个参数是通过测量反映权力凝聚力的Hausner指数来量化的。在两个实验过程中，使用X射线断层扫描分析突出了床异质结构的影响。
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