Collaborative Research: Multiscale study of oscillating flow and multiphase heat transfer in porous media

合作研究：多孔介质中振荡流和多相传热的多尺度研究

• 批准号: 2223171
• 负责人: Leitao Chen
• 金额: $ 13.26万
• 依托单位: Tennessee State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2024-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2223171&HistoricalAwards=false
• 关键词: Collaborative; Research; Multiscale; study; oscillating

In our evolving energy landscape, it is crucial to maximize the efficiency of energy technologies and understand the impact of fossil fuel extraction and carbon storage. Technologies that are central to this - subsurface remediation, geothermal energy systems, batteries, fracking, etc. - are governed by complicated flow through porous media, which is not currently well understood. A porous medium has multiple, convoluted pathways of various sizes for fluid flow through an otherwise solid material. The flows can be single phase (liquid/gas) or multiphase, and can occur at constant temperature or with heat transfer. The flow can occur in a single direction, or oscillate. When all of these are combined, nonlinear effects can result, which could improve the behavior of a system or negatively impact performance, depending on how the effects are propagated and understood. The major objective of this work is to experimentally study oscillating and multiphase flows in porous media, and then develop a numerical approach that can be used to gain further insight into the fundamental behavior, thereby improving energy efficiency, and lowering both economic costs and environmental impacts. Although porous media flow sounds esoteric, it occurs in many daily applications (brewing coffee, etc.). Therefore, this project is well suited for pre-college outreach, and several topics related to it will be used to engage underrepresented students from K-12 classrooms. In addition, this project will promote STEM education via an inter-college educational collaboration for undergraduate design projects, and demonstration units about porous media flows will be created for pre-college classrooms.This research will combine experimental and numerical techniques to describe the effects of the physical porous structure, the flow/heat transfer boundary layer (including a comparison between oscillation and non-oscillation) and the variations in wettability from materials and manufacturing process. Experimentally, naturally-occurring and engineered porous media will be scanned, analyzed, and catalogued in a database, and an experimental platform will also be designed and developed to study in situ oscillating and multiphase transport phenomena inside porous media using the Neutron Imaging Facility at Oak Ridge National Lab. This experimental work will be coupled with numerical simulations through parallel development of a multiphase discrete Boltzmann method model and a hybrid discrete/lattice Boltzmann method model to capture kinetic behaviors and multiscale interactions, in order to elucidate the fundamental behavior of oscillating multiphase thermofluidic phenomena and fluid-solid interactions. The knowledge developed in this project will, in turn, be used to improve the design of porous structures in a variety of energy applications, including thermal storage in concentrated solar power plants, carbon retention in rock structures, and fuel cells.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.

在我们不断发展的能源格局中，最大限度地提高能源技术的效率并了解化石燃料开采和碳储存的影响至关重要。对此至关重要的技术--地下修复、地热能系统、电池、水力压裂等--都受到多孔介质中复杂流动的控制，目前还没有很好的理解。多孔介质具有多个不同尺寸的回旋路径，用于流体流过另外的固体材料。流动可以是单相（液体/气体）或多相的，并且可以在恒定温度下或在热传递下发生。流动可以沿单一方向发生，也可以振荡。当所有这些结合在一起时，可能会产生非线性效应，这可能会改善系统的行为或对性能产生负面影响，这取决于如何传播和理解这些效应。这项工作的主要目标是实验研究多孔介质中的振荡和多相流，然后开发一种数值方法，可用于进一步了解基本行为，从而提高能源效率，降低经济成本和环境影响。虽然多孔介质流动听起来很深奥，但它发生在许多日常应用中（煮咖啡等）。因此，该项目非常适合大学预科外展，与之相关的几个主题将用于吸引K-12教室中代表性不足的学生。此外，本项目将通过大学间的本科设计项目教育合作促进STEM教育，并将为大学预科教室创建有关多孔介质流动的演示单元。本研究将结合联合收割机实验和数值技术来描述物理多孔结构的影响，流动/传热边界层（包括振荡和非振荡之间的比较）以及材料和制造工艺的润湿性变化。在实验上，自然发生的和工程多孔介质将被扫描，分析，并在数据库中编目，和一个实验平台也将被设计和开发，以研究在原位振荡和多孔介质内的多相传输现象使用中子成像设施在橡树岭国家实验室。这项实验工作将通过并行开发多相离散Boltzmann方法模型和混合离散/格子Boltzmann方法模型来捕获动力学行为和多尺度相互作用，从而与数值模拟相结合，以阐明振荡多相热流体现象和流体-固体相互作用的基本行为。在这个项目中开发的知识，反过来，将被用来改善多孔结构的设计，在各种能源应用，包括热存储在聚光太阳能发电厂，碳保留在岩石结构，燃料电池。这个奖项反映了NSF的法定使命，并已被认为是值得的支持，通过评估使用基金会的智力价值和更广泛的影响审查标准。