A novel approach for simultaneous hydrodynamic characterization of gas–liquid and gas–solid systems
A novel approach for simultaneous hydrodynamic characterization of gas–liquid and gas–solid systems
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DOI：
10.1016/j.ces.2012.12.031
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发表时间：
2013-08
影响因子：
4.7
通讯作者：
Mojgan Abbasi;N. Mostoufi;R. Sotudeh-Gharebagh;R. Zarghami
中科院分区：
文献类型：
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作者：
Mojgan Abbasi;N. Mostoufi;R. Sotudeh-Gharebagh;R. Zarghami
试图在频域中找到流化床和泡罩塔中的流体动力结构之间的类比。这种方法可以更好地了解这些两相反应器之间的流体动力学相似性。实验在空气-水鼓泡塔和空气-FCC流化床中进行。记录了两个系统在不同气体速度、纵横比和探头位置下的压力波动，并在频域和时频域中进行了分析。流化床和鼓泡塔的频谱揭示了与液体和固体的性质有关的差异和相似之处。流体动力学现象分为三种适用于泡罩塔和流化床的结构：宏观（0–3.125 Hz）、细观（3.125–12.5 Hz）和微观（12.5–25 Hz）结构。研究发现，宏观和细观结构在两个系统中表现出相似的行为。泡罩塔和流化床中压力波动的无量纲标准差与无量纲速度的关系图显示了两个系统相似的定性和定量行为。为每个结构发现的类似现象可以用作更好地理解这两个系统的标准。
An attempt was made to find an analogy between hydrodynamic structures in fluidized beds and bubble columns in the frequency domain. This approach provides a better picture of hydrodynamic similarities between these two-phase reactors. The experiments were carried out in an air–water bubble column and an air-FCC fluidized bed. Pressure fluctuations were recorded for both systems at various gas velocities, aspect ratios and probe positions and were analyzed in frequency and time-frequency domains. Frequency spectrum of fluidized bed and bubble column revealed differences and similarities which can be related to properties of liquid and solid. Hydrodynamic phenomena were classified into three structures applicable to both bubble column and fluidized bed: macro (0–3.125 Hz), meso (3.125–12.5 Hz) and micro (12.5–25 Hz) structures. It was found that the macro and meso structures exhibit a similar behavior in both systems. The plot of dimensionless standard deviation of pressure fluctuations in bubble column and fluidized bed against dimensionless velocity showed the similar qualitative and quantitative behavior for both systems. The analogous phenomena found for each structure can be used as a criterion for better understanding of both systems.