In biomass processing fluidized beds are used to process granular materials where particles typically possess elongated shapes. However, for simplicity, in computer simulations particles are often considered spherical, even though elongated particles experience more complex particle–particle interactions as well as different hydrodynamic forces. The exact effect of these more complex interactions in dense fluidized suspensions is still not well understood. In this study we use the magnetic particle tracking technique to compare the fluidization behavior of spherical particles to that of elongated particles. We found a considerable difference between fluidization behavior of spherical versus elongated particles in the time‐averaged particle velocity field as well as in the time‐averaged particle rotational velocity profile. Moreover, we studied the effect of fluid velocity and the particle's aspect ratio on the particle's preferred orientation in different parts of the bed, which provides new insight in the fluidization behavior of elongated particles.

中文翻译：

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球形粒子与细长粒子的流化：使用磁性粒子跟踪的实验研究

在生物质加工中，流化床用于加工颗粒状材料，其中颗粒通常具有细长的形状。但是，为简单起见，在计算机模拟中，粒子通常被认为是球形的，即使拉长的粒子会遇到更复杂的粒子，粒子相互作用以及不同的流体动力。在致密的流化悬浮液中，这些更复杂的相互作用的确切作用仍未得到很好的理解。在这项研究中，我们使用磁性粒子跟踪技术来比较球形粒子和细长粒子的流化行为。我们发现，在时间平均粒子速度场和时间平均粒子转速曲线中，球形粒子和细长粒子的流化行为之间存在相当大的差异。此外，我们研究了流速和颗粒长宽比对床不同部位颗粒优先取向的影响，这为细长颗粒的流化行为提供了新的见识。