COLLABORATIVE RESEARCH: Dynamics of Inertial Particles in Thermally-Stratified Flows within Electromagnetic Field

合作研究：电磁场内热分层流中惯性粒子的动力学

• 批准号: 1912907
• 负责人: Humberto Bocanegra Evans
• 金额: $ 3.7万
• 依托单位: Texas Tech University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-06-15 至 2019-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1912907&HistoricalAwards=false
• 关键词: COLLABORATIVE; RESEARCH; Dynamics; Inertial; Particles

Despite the multiple applications and impact in industry, environment, health, and defense, the role of particles in thermal transport processes remains poorly understood. By characterizing the fluid dynamics and particles in thermally stratified media under various conditions, the project will provide new knowledge applicable to a range of phenomena including rain formation, pollutant transport, inhaled particulate matter transport and mixing in transcontinental gas ducts. Additionally, by exploring the possibility of using magnetic particles as a control mechanism, the project will offer strategies to regulate industrial processes, with potentially increasing their efficiency. The research will provide insight on the control of thermal mixing for industrial as well as biological systems. The project will directly contribute to STEM education of K-12 students and educational development of both graduate and undergraduate students; significant efforts will be made to disseminate the results to the broader scientific community and to society.The project aims to quantitatively describe and significantly improve our understanding of the phenomena resulting from the interaction between thermally-stratified turbulent convection with inertial particles. Advanced experimental flow-diagnostic tools will be used to track a large set of inertial particles and flow tracers at high spatial and temporal resolutions. The work will examine the dominant factors modulating the dynamics of the particles, flow instability triggered by particles, preferential concentration, two- and four-way coupling between particles and flow. Special attention will be placed on characterizing such phenomena under disturbed natural convection via additional boundary conditions and electromagnetic control on particles. Analysis will include Eulerian and Lagrangian statistics as well as highly resolved trajectories, velocity, and acceleration of large set of particles. Results will uncover the role of control variables including the Stokes and Rayleigh numbers and volume fraction, which will provide basis for the development of strategies to control thermal processes in various applications.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

尽管在工业、环境、健康和国防中有多种应用和影响，但颗粒在热传输过程中的作用仍然知之甚少。该项目通过描述各种条件下热分层介质中的流体动力学和颗粒，将提供适用于一系列现象的新知识，包括降雨形成、污染物输送、吸入颗粒物输送和横贯大陆气体管道中的混合。此外，通过探索使用磁性粒子作为控制机制的可能性，该项目将提供监管工业流程的策略，并可能提高其效率。该研究将为工业和生物系统的热混合控制提供见解。该项目将直接促进K-12学生的STEM教育以及研究生和本科生的教育发展，并将努力向更广泛的科学界和社会传播成果。该项目旨在定量描述并显著提高我们对热分层湍流对流与惯性粒子相互作用所产生的现象的理解。先进的实验流动诊断工具将被用来跟踪一个大的惯性粒子和流动示踪剂在高空间和时间分辨率。这项工作将研究的主导因素调制的动态的颗粒，流动不稳定性引发的颗粒，优先浓度，双向和四向颗粒和流动之间的耦合。特别注意将放在通过附加的边界条件和电磁控制粒子扰动自然对流下的特性，这样的现象。分析将包括欧拉和拉格朗日统计，以及高分辨率的轨迹，速度和大量粒子的加速度。结果将揭示控制变量的作用，包括斯托克斯和瑞利数和体积分数，这将提供基础的发展战略，以控制在各种应用中的热过程。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

项目成果

Making droplets glow in turbulence

使水滴在湍流中发光

• DOI: 10.1103/physrevfluids.5.044303
• 发表时间: 2020
• 期刊: Physical Review Fluids
• 影响因子: 2.7
• 作者: Bocanegra Evans, Humberto;Dam, Nico;Bertens, Guus;van de Water, Willem
• 通讯作者: van de Water, Willem