CAREER: Non-equilibrium Dynamics of Thin Fluidized Granular Media

职业：薄流化颗粒介质的非平衡动力学

• 批准号: 9875529
• 负责人: Jeffrey Urbach
• 金额: $ 46.99万
• 依托单位: Georgetown University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-02-01 至 2005-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9875529&HistoricalAwards=false
• 关键词: CAREER; Non; equilibrium; Dynamics; Thin

Urbach9875529This is a Condensed Matter Physics CAREER project. The research deals with non-equilibrium dynamics of excited granular media, focusing on a monolayer of nearly identical spheres on a flat plate vibrating vertically. This simple and easily controllable system exhibits a rich variety of cooperative phenomena which will be quantitatively investigated using computer imaging techniques. Direct measurements of the statistical distribution and correlation functions necessary for the construction of a kinetic theory of the non-equilibrium granular fluid will be made. Transport of particles, energy , and momentum in the layer will be studied and compared with the behavior predicted from the kinetic theory. In addition, the novel collective behavior of the system will be studied to develop and test theories of `granular thermodynamics'. These results will provide a deeper understanding of the dynamics of granular media, an essential step towards improved models of a wide range of important industrial processes. These conceptually simple but visually striking experiments will be used to increase the number and quality of physics majors through incorporation into a statistical mechanics course and a travelling show to be taken to local high schools in the community.%%% This is a Condensed Matter Physics CAREER project. The research deals with the behavior of a large number of nearly identical spherical particles on a vibrating plate. This simple and easily controllable system exhibits a rich variety of surprising phenomena that arise from the energy lost during inter-particle collision. The behavior will be quantitatively investigated using computer imaging techniques. Theories that relate the statistical behavior of individual grains to the average properties of the collection of grains will be developed and tested. These results will provide a deeper understanding of the dynamics of granular media, an essential step towards improved models of a wide range of important industrial processes, including transport and processing of grains and powders, and gas fluidized beds used in petroleum processing. These conceptually simple but visually striking experiments will be used to increase the number and quality of physics majors through incorporation into undergraduate courses, and a traveling show to be taken to local high schools in the community.

Urbach9875529这是一个凝聚态物理职业项目。研究了受激颗粒介质的非平衡动力学，主要研究了平板上单层几乎相同的球体垂直振动。这个简单，易于控制的系统表现出丰富多样的合作现象，将使用计算机成像技术进行定量研究。直接测量的统计分布和相关函数的非平衡颗粒流体的动力学理论的建设是必要的。传输的粒子，能量和动量的层将进行研究，并从动力学理论预测的行为进行比较。 此外，还将研究该系统的新集体行为，以发展和检验“颗粒动力学”理论。这些结果将提供一个更深入的了解颗粒介质的动力学，一个重要的一步，改进模型的广泛的重要工业过程。这些概念上简单但视觉上引人注目的实验将被用于增加物理专业学生的数量和质量，通过纳入统计力学课程和巡回演出，带到社区的当地高中。这是一个凝聚态物理的职业生涯项目。研究了大量近似相同的球形颗粒在振动平板上的运动。这个简单且易于控制的系统展现出丰富多样的令人惊讶的现象，这些现象是由粒子间碰撞过程中的能量损失引起的。将使用计算机成像技术定量研究该行为。将发展和检验将个别颗粒的统计行为与颗粒集合的平均性质联系起来的理论。 这些结果将提供一个更深入的了解颗粒介质的动力学，一个重要的一步，改进模型的广泛的重要工业过程，包括运输和加工的谷物和粉末，以及气体流化床用于石油加工。这些概念简单但视觉上引人注目的实验将被用于通过纳入本科课程来增加物理专业的数量和质量，并在社区的当地高中进行巡回演出。