Benchmark Data and Analysis of Dilute and Dense-Phase, Fluid-Particle Flow in the Collisional, Viscous, and Transition Regimes

提案编号：0651667主要研究人员：Curtis， jennifer隶属机构：佛罗里达大学提案标题：碰撞、粘性和过渡状态下稀相和密相、流体-颗粒流的基准数据和分析流体-颗粒流普遍存在于各种工业和地球物理过程中。在许多应用中，颗粒相互碰撞，流体和固相之间也存在复杂的相互作用，这些相互作用显著影响这些多颗粒碰撞。目前存在的基本模型不能充分描述这种“过渡”状态下的流体-颗粒流动（正如Bagnold（1954）最初所标记的那样）。相反，绝大多数研究（以及科学界目前对流体-颗粒流动的最佳理解）都是针对完全在惯性主导状态下（流体相对颗粒之间直接相互作用的影响被忽略）或宏观粘性状态下（流体相在粒子动量传递力学中起重要作用）运行的过程。阻碍改进理解和发展基本模型的关键限制是缺乏详细的、非侵入式的“过渡”流场测量，以及连接过渡流场与惯性主导流场和粘滞主导流场的测量。目前关于流体-颗粒流动的实验信息是非常零碎的。以前的实验集中在一个特定的制度的颗粒流动在有限的操作条件范围。所提出的工作的智力价值在于实验测量是统一的，在某种意义上，这些新颖的测量将弥合颗粒流动形式在固体浓度和流体流速范围内的差距。这些实验测量将在一个独特的、中试规模的流动回路设施中进行。该设施允许跨越颗粒流动行为的制度的操作条件。因此，这些测量将广泛影响我们对流体-颗粒流动的理解。由此产生的流量测量将为流体-颗粒流动模型的开发和验证提供科学文献中的基准。改进的流动模型将在CFD模拟方面取得重大进展，这些模拟针对的是各种流体颗粒流动的放大操作、优化和设计。此外，通过佛罗里达大学粒子工程研究中心（PERC）本科生研究奖励计划，每年有一名博士生和几名本科生参与研究，将产生其他广泛的影响。最后，通过将我们的发现传播到科学界，通过期刊出版物/会议报告以及通过PERC提供的课程对大量学生的教育，研究将产生广泛的影响。这项工作产生的数据集将通过PI维护的一个网站向公众提供。

Proposal Number: 0651667Principal Investigators: Curtis, JenniferAffiliation: University of FloridaProposal Title: Benchmark Data and Analysis of Dilute and Dense-Phase, Fluid-Particle Flow in the Collisional, Viscous, and Transition RegimesFluid-particle flows are prevalent across a diverse range of industrial and geophysical processes. In many applications, particles engage in collisions with each other, and there are also complex interactions between the fluid and the solid phases that significantly influence these multiple particle collisions. Fundamental models that currently exist do not adequately describe fluid-particle flow in this "transitional" regime (as originally labeled by Bagnold (1954)). Instead, the vast majority of research (and the scientific community's best current understanding of fluid-particle flows) are for processes operating exclusively in either the inertia-dominated regime (where the influence of the fluid phase on the direct interactions between particles is neglected) or the macroviscous regime (where the fluid phase plays the significant role in the mechanics of particle momentum transport). The key limitation impeding improved understanding and the development of fundamental models is the lack of detailed, non-intrusive flow measurements in this "transitional" regime, as well as measurements which bridge the transitional regime with both the inertia-dominated and viscous-dominated regimes. The current body of experimental information for fluid-particle flows is highly piecemeal. Previous experimentation has focused on one specific regime of particulate flow over a limited range of operating conditions. The intellectual merit of the proposed work lies in the experimental measurements that are unifying in the sense that these novel measurements will bridge the gap between particle flow regimes over a range of solids concentrations and fluid flowrates. These experimental measurements will be made in a unique, pilot-scale, flow loop facility. This facility allows for operating conditions that span the regimes for particle flow behavior. Hence, these measurements will broadly impact our understanding of fluid-particle flows. The resulting flow measurements will provide a benchmark in the scientific literature for fluid-particle flow model development and validation. Improved flow models will yield significant advances in CFD simulations targeted towards scale-up operations, optimization and design of a wide variety of fluid-particle flows. In addition, there will be other broad impacts from the research through involvement of one PhD student and several undergraduate students each year via The University of Florida's Particle Engineering Research Center's (PERC's) Undergraduate Research Awards program. Finally, there will be broad impacts from the research via dissemination of our findings to the scientific community - both through journal publications/conference presentations and through the education of large numbers of students via courses offered through PERC. The dataset resulting from the effort will be made available to the public via a website maintained by the PI.