颗粒流化床中的气体流动模式

IF 2.4 3区 工程技术 Granular Matter Pub Date : 2024-03-18 DOI:10.1007/s10035-024-01415-5
Wilson Barros Jr.
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引用次数: 0

摘要

摘要在这里,我们展示了使用磁共振成像技术来监测激光极化氙(\(^{129}\)Xe)气体作为玻璃珠包的流化相在直圆管内的工作情况,模拟颗粒状气体流化床。这种成像方法能够对不同流动状态下气体垂直上升流的空间分辨速度和扩散二维轴向图进行编码。从这些地图中,我们可以识别出气体流动的转变、滞后环、停滞区域和反向流动,所有这些都与探测床内颗粒的流动动力学报告相关,并且是互补的。我们尤其关注起泡的初始阶段,在这一阶段,有关气流空间图及其与颗粒动力学潜在相关性的定量数据非常稀少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Gas flow patterns in a granular fluidized bed

Here we demonstrate the use of magnetic resonance imaging for monitoring a laser-polarized xenon (\(^{129}\)Xe) gas working as a fluidizing phase for a glass bead pack, inside a straight circular tube, simulating a granular gas-fluidized bed. The imaging method enabled encoding spatially resolved velocity and diffusion 2D-axial maps of the gas vertical upflow at variable flow regimes. From these maps one could identify gas flow transitions, hysteresis loops, regions of stagnation, and reversed flow, all of which associated, as well as complementary, to reported flow dynamics probing the particles inside the bed. In particular, we focused on the initial stage of bubbling where quantitative data on gas flow spatial maps and their potential correlation with the granular particles dynamics are scarce.

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来源期刊
Granular Matter
Granular Matter MATERIALS SCIENCE, MULTIDISCIPLINARY-MECHANICS
CiteScore
4.30
自引率
8.30%
发文量
95
期刊介绍: Although many phenomena observed in granular materials are still not yet fully understood, important contributions have been made to further our understanding using modern tools from statistical mechanics, micro-mechanics, and computational science. These modern tools apply to disordered systems, phase transitions, instabilities or intermittent behavior and the performance of discrete particle simulations. >> Until now, however, many of these results were only to be found scattered throughout the literature. Physicists are often unaware of the theories and results published by engineers or other fields - and vice versa. The journal Granular Matter thus serves as an interdisciplinary platform of communication among researchers of various disciplines who are involved in the basic research on granular media. It helps to establish a common language and gather articles under one single roof that up to now have been spread over many journals in a variety of fields. Notwithstanding, highly applied or technical work is beyond the scope of this journal.
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