U.S.-France Cooperative Research: Flows of Grains Down Inclined Channels

0233212 Louge这个为期三年的奖项是为美国和法国在粒子科学方面的合作而设立的，涉及康奈尔大学和雷恩大学的研究人员和学生。 美国的Michel Louge和法国的Luc Oger领导了这个关于倾斜表面下颗粒重力流的合作项目。 他们将研究非线性颗粒波在平坦摩擦平面上的起源和增长。 这些波可导致流动的间歇性堵塞。 在康奈尔大学收集的实验数据将使用相应的水力理论的稳定性分析进行解释。 法国在非线性稳定性和“粒子-细胞”数值分析方面的专业知识对此进行了补充。 第二个目标是建立如何充分碰撞颗粒流可以出现在一个颠簸的斜坡。 如果它们可以持续，它们需要相对小的倾斜角度。 为了研究它们的动力学，研究人员将利用雷恩的一个颗粒设施斜槽，并根据他们的碰撞理论解释测量结果。 该奖项代表了美国方面向NSF和CNRS提出的平行建议。 NSF将为美国调查员及其学生支付旅费和生活费。CNRS将支持法国研究人员和学生访问美国。 该项目探索粒子科学中的基本问题，这些问题对工业过程产生影响，如矿石的提取和加工，化学工程和地质现象，如岩石滑坡和雪崩。

0233212LougeThis three-year award for US-France collaboration in particle science involves researchers and students at Cornell University and the University of Rennes. Michel Louge in the US and Luc Oger in France lead this cooperative project on the gravitational flow of grains down inclined surfaces. They will investigate the origin and growth of nonlinear granular waves on a flat frictional plane. These waves can lead to intermittent jamming of the flow. Experimental data collected at Cornell will be interpreted using a stability analysis of the corresponding hydraulic theory. This is complemented by French expertise in nonlinear stability and "particle-In-Cell" numerical analysis. The second goal is to establish how fully collisional granular flows can arise on a bumpy incline. If they can be sustained, they require relatively small angles of inclination. To study their dynamics, the investigators will utilize a granular facility chute at Rennes and interpret measurements based on their collisional theories. This award represents the US side of parallel proposals to the NSF and the CNRS. NSF will cover travel funds and living expenses for the US investigator and his students. The CNRS will support visits by French researchers and students to the United States. The project explores fundamental questions in particle science that have implications for industrial processes as diverse as the extraction and processing of ores and chemical engineering and geological phenomena like rockslides and avalanches.