On the use of a powder rheometer to probe defluidization of cohesive particles

On the use of a powder rheometer to probe defluidization of cohesive particles
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使用粉末流变仪探测粘性颗粒的反流态化

DOI:
10.1016/j.ces.2019.115422
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发表时间:
2020
影响因子:
4.7
通讯作者:
Hrenya, Christine M.
Hrenya, Christine M.
中科院分区:
工程技术2区
文献类型:
--
作者:
Mishra, Ipsita;Liu, Peiyuan;Shetty, Abhishek;Hrenya, Christine M.

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颗粒间凝聚力在各种工业单元操作中起着重要作用。最近,颗粒去流化被确定为可用于提取颗粒间凝聚力的体积测量(Liu等人,2018年)。这种方法需要直接耦合的实验,“标准”的反流化曲线(压降与气体速度)与离散元法(DEM)模拟;“标准”是指反流化无沟流。因此,该方法不容易适用于表现出沟道效应的高内聚性(C组)颗粒。在这项工作中,我们获得了标准的反流化曲线的C组颗粒使用流变仪与旋转叶轮。然后,我们确认,从流变仪的测量是系统大小无关的,从而确保直接耦合的实验与较小的DEM模拟的可行性。此外,我们表明,旋转叶轮所需的扭矩可以提供一种替代的压降来表征颗粒去流化。最后,我们表明,从这些实验中提取的特征速度可以提供一个粒子级凝聚力的相对规范。
Inter-particle cohesion plays an important role in various industrial unit operations. Recently, particle defluidization was identified as a bulk measurement that can be used to extract inter-particle cohesion (Liu et al., 2018). This method requires direct-coupling of experimental, “standard” defluidization curves (pressure-drop vs. gas velocity) with discrete-element-method (DEM) simulations; “standard” refers to defluidization without channeling. Hence, the method is not readily applicable to highly-cohesive (Group C) particles that exhibit channeling. In this work, we obtain standard-defluidization-curves for Group C particles using a rheometer with a rotating impeller. Then, we confirm that the measurements from the rheometer are system-size-independent, thereby ensuring the feasibility of direct-coupling of the experiments with smaller DEM simulations. Furthermore, we show that the torque required to rotate the impeller may provide an alternative to the pressure-drop to characterize particle defluidization. Finally, we show that the extracted characteristic-velocities from these experiments may provide a relative-gauge for particle-level cohesion.
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DOI: --
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期刊: 人文論究(関西学院大学人文学会) 54・1
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