Axial segregation in bubbling gas-fluidized beds with Gaussian and lognormal distributions of Geldart Group B particles
Axial segregation in bubbling gas-fluidized beds with Gaussian and lognormal distributions of Geldart Group B particles
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DOI：
10.1002/aic.12219
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发表时间：
2010-12
期刊：
影响因子：
3.7
通讯作者：
J. Chew;J. R. Wolz;C. Hrenya
中科院分区：
文献类型：
--
作者：
J. Chew;J. R. Wolz;C. Hrenya
鼓泡，气体流化床实验涉及Geldart集团B颗粒连续尺寸分布已进行。将不同宽度的正态分布和对数正态分布的砂粒进行完全流化，然后通过冷冻床切片获得了浓度的轴向分布。与以往的二元系统的工作相似，结果表明，平均粒径随着床层高度的增加而减小，并且更宽的高斯分布显示出更大的偏析程度。然而，令人惊讶的是，对数正态分布表现出非单调的分布宽度的隔离趋势。此外，局部尺寸分布的形状相对于总体分布的形状在很大程度上保持不变。这些研究结果的性质的本地粒度分布提供了实验确认以前的结果颗粒和气固模拟。最后，一个有趣的观察是，虽然单分散Geldart D组颗粒不能完全流化，但它们在对数正态分布中的存在仍然导致所有颗粒的完全流化。© 2010美国化学工程师学会AIChE J，2010
Bubbling, gas-fluidized bed experiments involving Geldart Group B particles with continuous-size distributions have been carried out. Sand of various widths of Gaussian or lognormal distributions were completely fluidized, then axial concentration profiles were obtained from frozen-bed sectioning. Similar to previous works on binary systems, results show that mean particle diameter decreases with increasing bed height, and that wider Gaussian distributions show increased segregation extents. Surprisingly, however, lognormal distributions exhibit a nonmonotonic segregation trend with respect to distribution widths. In addition, the shape of the local-size distribution is largely preserved with respect to that of the overall distribution. These findings on the nature of local-size distribution provide experimental confirmation of previous results for granular and gas-solid simulations. Lastly, an interesting observation is that although monodisperse Geldart Group D particles cannot be completely fluidized, their presence in lognormal distributions investigated still results in complete fluidization of all particles. © 2010 American Institute of Chemical Engineers AIChE J, 2010