Non-Invasive Probes of Granular Materials: Magnetic Resonance Imaging, Capacitance and High-Speed Video

利用时间和空间分辨率提高的磁共振成像(MRI)技术将测量无粘性颗粒材料的流动微结构。主要目的是更好地理解颗粒在摇动、混合和共享时颗粒系统的运动。非侵入性电容式探头将用于密度(固体浓度)测量，高速相机将提供有关透明墙附近颗粒间碰撞的信息。将考虑准二维和三维流动区域。探讨了颗粒-颗粒和颗粒-壁面相互作用对整体流型的影响，并获得了模型验证的实验数据。这些实验与对流驱动的颗粒分离和颗粒压实有直接关系。对结果的解释与粒子处理和加工中的更广泛的现象类别相关。

The flow microstructure of non-cohesive granular materials will be measured by using Magnetic Resonance Imaging (MRI) with improved spatial and temporal resolution. The main objective is better understanding of motion of particulate systems when the particulates are shaken, mixed and shared. Non-intrusive capacitive probes will be used for density (solids concentration) measurements, and a high speed camera will provide information on inter-particle collisions in the proximity of transparent walls. Quasi-two- and three-dimensional flow domains will be considered. The connection between particle-particle and particle-wall interactions on the overall flow pattern will be probed, and experimental data for model verification will be obtained. The experiments have direct relevance to convection-driven particle separation and particle compaction. The interpretation of the results has relevance to a broader category of phenomena in particle handling and processing.