Material Instabilities in Particulate Systems

摘要CTS-9510121将研究流体-颗粒混合和颗粒流动的不稳定性。采用计算机模拟技术研究颗粒介质和悬浮液缓慢共享运动中空间均匀过程的膨胀和剪切不稳定性。实验结果将采用折射率匹配、光色示踪粒子法进行验证。本文将运用动力学理论和连续介质力学分析Bagnold颗粒惯性状态下颗粒流动（包括聚类）的稳定性。了解悬浮液和颗粒流的不稳定性是多相流理论的一个重要方面。它在处理固体的工业设备的设计和岩土工程现象的分析中有重要的应用。＊＊＊

Abstract CTS-9510121 Fluid-particle mixture and granular flow instabilities will be investigated. The dilatational and shearing instabilites of spatially homogeneous processes in slow sharing movement of granular media and suspensions will be studied using a computer simulation technique. The results will be tested in an experiment using the index of refraction matched, photochromatic tracer particle method. The stability of granular flow, including clustering, in the Bagnold grain-inertia regime will analyzed by using both kinetics theory and continuum mechanics. Understanding instabilities in suspension and granular flows is a critical aspects of the multiphase flow theory. It has important applications in the design of industrial equipment handling solids and in the analysis of geotechnical phenomena. ***