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首页> 外文期刊>Journal of industrial and engineering chemistry >Fine particle flow pattern and region delimitation in fountain confined conical spouted beds
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Fine particle flow pattern and region delimitation in fountain confined conical spouted beds

机译：喷泉的细颗粒流动模式和区域界限紧密圆锥形喷射床

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摘要

A novel borescopic technique together with the monitoring of pressure fluctuation signals (power spectral distribution, PSD) has been used to track fine particles and characterize solid flow dynamics in fountain confined conical spouted beds. Radial and axial particle velocity profiles have been obtained for different configurations, and spout-annulus and fountain core-periphery interfaces have been delineated. The downward particle velocities in the annulus peak at intermediate positions in this zone, whereas the upward velocities in the dilute zones (spout and fountain core) peak at the axis or close to this position. Among the different configurations analysed in this work, the system without draft tube shows the greatest vertical particle velocities in almost all the different radial and axial positions. The evolution of the spout size along the bed depends on the configuration used, but all of them differ from those commonly reported in the literature. Thus, the spout expands from the bed bottom to the surface, without any neck at an intermediate bed level. Furthermore, the cross-sectional spout shape has been delineated in the systems with open-sided draft tube, and significant spout expansion is observed due to air percolation from the spout into the annulus through the opened faces. Finally, the average spout diameters of the systems without draft tube and with open-sided draft tubes have been compared with those predicted by literature correlations. Those proposed by San Jose et al. and Volpicelli et al. provide the best fit for the configurations without draft tube and with open-sided draft tube, with their relative errors being 9.83% and 8.88%, respectively.
机译：采用一种新的内窥技术和压力波动信号（功率谱分布，PSD）监测技术，对喷泉约束锥形喷动床中的细颗粒进行了跟踪，并对固体流动动力学进行了表征。获得了不同结构下的径向和轴向颗粒速度分布，描绘了喷口环空和喷泉核心外围界面。环空中的向下颗粒速度在该区域的中间位置达到峰值，而稀释区域（喷口和喷泉芯）中的向上速度在轴或靠近该位置处达到峰值。在本文分析的不同结构中，在几乎所有不同的径向和轴向位置，无尾水管的系统显示出最大的垂直颗粒速度。喷口尺寸沿床层的演变取决于所使用的配置，但所有这些都不同于文献中常见的报道。因此，喷口从床底扩展到表面，中间床层没有任何颈部。此外，在带有开口侧尾水管的系统中，已经描绘出了横截面喷口形状，并且由于空气从喷口通过开口面渗入环空，观察到了显著的喷口膨胀。最后，将无尾水管和有开口侧尾水管的系统的平均喷口直径与文献关联式预测的喷口直径进行了比较。San Jose et al.和Volpicelli et al.提出的方案最适合无尾水管和有开口侧尾水管的配置，其相对误差分别为9.83%和8.88%。

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