准二维脉冲流化床的动力学研究
On the Dynamics of a Quasi-Two-Dimensional Pulsed-Fludized Bed
摘要：
固体在气体介质中的周期性流化可以产生结构化的鼓泡模式。这种现象已经在称为脉冲流化床的流化床系统中成功地再现，该系统以其有效的混合和可调谐性而闻名。所得到的图案取决于颗粒特性、床的尺寸、平均入口速度、床高度以及脉冲的振幅和频率。然而，重要的是要了解与起泡模式相关的颗粒流变学的变化。在实验工作中，我们报告的结果，从一个小规模的准二维脉冲流化床。适当的正交分解分析应用到粒子跟踪测速数据揭示了一个重新分配的能量之间的谐波和次谐波模式的进气频率降低。鼓泡模式的变化伴随着颗粒动力学的变化，由于颗粒相运动的主导模式。
英文摘要：
Periodic fluidization of solids in a gas medium can generate structured bubbling patterns. This phenomenon has been successfully reproduced in fluidized bed systems called pulsed-fluidized beds, known for their efficient mixing and tunability. The resulting pattern depends on particle properties, dimensions of the bed, mean inlet velocity, bed height, and amplitude and frequency of pulsing. It is however important to understand the changes in granular rheology associated with bubbling patterns. In the experimental work presented, we report on the results from a small-scale quasi-two-dimensional pulsed-fluidized bed. Proper Orthogonal Decomposition analysis applied to Particle Tracking Velocimetry data reveals a redistribution of energy between the harmonic and sub-harmonic modes as the inlet gas frequency is decreased. The change in bubbling pattern is accompanied by a change in granular dynamics due to the dominant modes of particle-phase motion.
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