CAREER: High Resolution Particle Tracking in Granular and Turbulent Fluid Flows

** 非技术摘要 ** 该学院早期职业奖支持一个项目，以测量湍流和颗粒流中的颗粒轨迹。 本文提出了一种结合立体高速成像和实时图像处理的新型粒子跟踪系统。 该系统与人类视觉系统跟踪物体的方式有许多相似之处，具有广泛的应用潜力。 预计这些研究将有助于解决一些关键问题，例如湍流轨迹如何取决于创建流动的方法以及沉积物如何在湍流中运输。 高速成像也将用于测量流动谷物中发生的快速变化。颗粒状材料可以在具有颗粒之间的许多碰撞的流体状状态和没有颗粒运动的静止堆之间快速转变。 这些研究将指导寻找更好的描述这些转变。这些结果将是感兴趣的工业，如农业和采矿业，其中颗粒材料被广泛使用。将开展两项教育和外联活动。在量子和经典力学的高层次本科课程，强调学生通过实验活动学习的积极参与，将在卫斯理大学开发。通过与PIMMS（项目，以提高数学和科学的掌握）的伙伴关系，教师将培训在城市学区小学教师掌握他们教他们的学生物理科学单元的内容。该项目由材料研究部（凝聚态物理学）和化学传输系统部（颗粒和多相过程）共同资助。技术摘要 * 该学院早期职业奖支持一个项目，通过高分辨率光学粒子跟踪测量来发展我们对湍流和颗粒流的动态理解。 该项目将开发一种新的成像设计，使用立体高速成像和实时图像处理来获取湍流流动中平流颗粒的3D轨迹。这些研究将有助于解决有关湍流轨迹的普遍性和湍流中大的非中性浮力颗粒的运动的关键问题。在颗粒流中，精确的颗粒跟踪将允许新的测量时间相关的统计字段。 在振动流化准二维颗粒气体重力塌陷的测量将提供关键的测试如何流体动力学近似开始失败。此外，还将开展两项教育和外联活动。在量子和经典力学的高层次本科课程，强调学生通过实验活动学习的积极参与，将在卫斯理大学开发。通过与PIMMS（提高数学和科学掌握程度项目）的合作，PI将培训城市学区的小学教师掌握他们向学生教授的物理科学单元的内容。该项目由材料研究部（凝聚态物理学）和化学传输系统部（颗粒和多相过程）共同资助。

*******NON-TECHNICAL ABSTRACT*******This Faculty Early Career award supports a project to measure particle trajectories in turbulent fluids and granular flows. A novel system combining stereoscopic high speed imaging with real-time image processing will be developed to track the particles. This system has many similarities to the way the human visual system tracks objects, and it has potential for broad application. The studies are expected to help resolve key questions such as how turbulent trajectories depend on the method of creating the flow and how sediments are transported in turbulence. High-speed imaging will also be used to measure the rapid changes that occur in flowing grains. Granular materials can quickly transition between a fluid-like state with many collisions between particles and a stationary pile with no particle motion. The studies will guide the search for a better description of these transitions. These results would be of interest to industries such as agriculture and mining, where granular materials are widely used. Two educational and outreach initiatives will be pursued. Upper level undergraduate courses in quantum and classical mechanics, emphasizing the active engagement of students in learning through experimental activities, will be developed at Wesleyan University. Through a partnership with PIMMS (Project to Increase Mastery of Mathematics and Science), the faculty member will train elementary teachers in urban school districts in mastering the content of the physical science units they teach to their students. This project is co-funded by the Division of Materials Research (Condensed Matter Physics) and the Division of Chemical Transport Systems (Particulate and Multiphase Processes).********TECHNICAL ABSTRACT*****This Faculty Early Career award supports a project to develop our dynamical understanding of turbulent and granular flows through high-resolution optical particle tracking measurements. The project will develop a novel imaging design that uses stereoscopic high-speed imaging and real-time image processing to acquire 3D trajectories of particles advected in turbulent fluid flow. These studies will help resolve key questions about the universality of turbulent trajectories and the motion of large and non-neutrally buoyant particles in turbulent flows. In granular flows, precision particle tracking will allow new measurements of time-dependent statistical fields. Measurements in a vibrofluidized quasi-2D granular gas undergoing gravitational collapse will provide critical tests of how hydrodynamic approximations begin to fail. In addition two educational and outreach initiatives will be pursued. Upper level undergraduate courses in quantum and classical mechanics, emphasizing the active engagement of students in learning through experimental activities, will be developed at Wesleyan University. Through a partnership with PIMMS (Project to Increase Mastery of Mathematics and Science), the PI will train elementary teachers in urban school districts in mastering the content of the physical science units they teach to their students. This project is co-funded by the Division of Materials Research (Condensed Matter Physics) and the Division of Chemical Transport Systems (Particulate and Multiphase Processes).