Fluidization is widely used in industries and has been extensively studied, both experimentally and theoretically, in the past. However, most of these studies focus on spherical particles while in practice granules are rarely spherical. Particle shape can have a significant effect on fluidization characteristics. It is therefore important to study the effect of particle shape on fluidization behavior in detail. In this study, experiments in pseudo‐2D fluidized beds are used to characterize the fluidization of spherocylindrical (rod‐like) Geldart D particles of aspect ratio 4. Pressure drop and optical measurement methods (Digital Image Analysis, Particle Image Velocimetry, Particle Tracking Velocimetry) are employed to measure bed height, particle orientation, particle circulation, stacking, and coordination number. The commonly used correlations to determine the pressure drop across a bed of nonspherical particles are compared to experiments. Experimental observations and measurements have shown that rod‐like particles are prone to interlocking and channeling behavior. Well above the minimum fluidization velocity, vigorous bubbling fluidization is observed, with groups of interlocked particles moving upwards, breaking up, being thrown high in the freeboard region and slowly raining down as dispersed phase. At high flowrates, a circulation pattern develops with particles moving up through the center and down at the walls. Particles tend to orient themselves along the flow direction. © 2018 The Authors AIChE Journal published by Wiley Periodicals, Inc. on behalf of American Institute of Chemical Engineers AIChE J, 64: 1573–1590, 2018

中文翻译：

---

伪二维流化床中的非球形颗粒：实验研究

流化在工业中被广泛使用，并且过去已经在实验和理论上进行了广泛的研究。但是，这些研究大多数集中在球形颗粒上，而实际上颗粒很少是球形的。颗粒形状可对流化特性产生重大影响。因此，重要的是详细研究颗粒形状对流化行为的影响。在这项研究中，使用在伪2D流化床中进行的实验来表征长宽比为4的球形圆柱（杆状）Geldart D颗粒的流化。压降和光学测量方法（数字图像分析，颗粒图像测速，颗粒跟踪测速）用于测量床高，颗粒方向，颗粒循环，堆积和配位数。将确定非球形颗粒床上的压降的常用相关性与实验进行了比较。实验观察和测量表明，棒状颗粒易于互锁和窜动。远高于最小流化速度，观察到剧烈的鼓泡流化，成组的互锁颗粒向上移动，破碎，在干舷区域被高抛，并逐渐下雨为分散相。在高流量下，会形成循环模式，其中颗粒会从中心向上移动并在壁上向下移动。粒子趋向于沿流动方向定向。©2018 Wiley Periodicals，Inc.代表美国化学工程师学会出版的《作者AIChE期刊》实验观察和测量表明，棒状颗粒易于互锁和窜动。远高于最小流化速度，观察到剧烈的鼓泡流化，成组的互锁颗粒向上移动，破碎，在干舷区域被高抛，并逐渐下雨为分散相。在高流量下，会形成循环模式，其中颗粒会从中心向上移动并在壁上向下移动。粒子趋向于沿流动方向定向。©2018 Wiley Periodicals，Inc.代表美国化学工程师学会出版的《作者AIChE期刊》实验观察和测量表明，棒状颗粒易于互锁和窜动。远高于最小流化速度，观察到剧烈的鼓泡流化，成组的互锁颗粒向上移动，破碎，在干舷区域被高抛，并逐渐下雨为分散相。在高流量下，会形成循环模式，其中颗粒会从中心向上移动并在壁上向下移动。粒子趋向于沿流动方向定向。©2018 Wiley Periodicals，Inc.代表美国化学工程师学会出版的《作者AIChE期刊》一组互锁的粒子向上移动，破碎，被甩向干舷区域，然后逐渐散落成雨状。在高流量下，会形成循环模式，其中颗粒会从中心向上移动并在壁上向下移动。粒子趋向于沿流动方向定向。©2018 Wiley Periodicals，Inc.代表美国化学工程师学会出版的《作者AIChE期刊》一组互锁的粒子向上移动，破碎，被甩向干舷区域，然后逐渐散落成雨状。在高流量下，会形成循环模式，其中颗粒会从中心向上移动并在壁上向下移动。粒子趋向于沿流动方向定向。©2018 Wiley Periodicals，Inc.代表美国化学工程师学会出版的《作者AIChE期刊》AIChE J，64：1573–1590，2018