Interfacial Dynamics in Displacement Flows of Entangled Polymeric Fluids

美国国家科学基金会-化工和运输系统颗粒和多相工艺计划部门(1415)提案编号：0651497主要研究人员：科马米，巴米尼亚：田纳西大学诺克斯维尔分校建议标题：纠缠聚合物流体置换流中的界面动力学知识置换流在一大类多相流中无处不在，在许多领域具有巨大的实际应用，如气体辅助注射成型、提高石油采收率、中空纤维膜的生产和基材涂层。这项拟议的工作将整合聚合物物理、粘弹性流体力学和计算科学的进展，以发展对线形和支化聚合物熔体置换流动中界面动力学的力学理解。拟议活动的智力优势包括：对聚合物浓度和结构对原型气液驱替流动界面动力学的影响进行全面的实验研究。直接模拟线状和支化缠绕聚合物溶液的典型气液置换流动的界面不稳定性。测定热效应(即粘性加热和流体的热敏感性的耦合)对线形和支化缠绕聚合物溶液的典型气液置换流动的界面动力学的影响。拟议的研究将导致为工业相关过程开发经过实验验证的高保真过程模拟工具--在这个领域，迫切需要计算工具来合理化商品和附加值产品的净形液态过程的设计和操作。更广泛的影响当前和未来技术的成功及其改善我们生活质量的潜力在很大程度上取决于创造一支装备精良的劳动力队伍，以应对现代科学和工程挑战。我们的主要目标之一是通过课堂和实验室经验开发一种教学系统，用于培养计算材料科学和工程方面的研究生和本科生。在过去的十年里，美国各级教育机构的毕业生在这一领域明显落后于欧洲同行。因此，拟议的研究/教育计划是必要的和及时的。多样性和外展：田纳西大学诺克斯维尔分校(UTK)的各种项目，如NSF支持的TLSAMP、管道工程多样性项目和GEM，将被用来确保非裔美国人、西班牙裔美国人、土著美国人和女性学生参与这项研究。我们还将利用UTK广泛的外展基础设施，让K-12教师和高中生参与研究计划。基于互联网的传播：这项研究产生的模拟模块、实验数据库、技术出版物和演示文稿将放在一个积极维护的网页上。中间件将用于基于Web的模拟模块执行和数据可视化。行业互动：涂料行业充分认识到拟议研究的价值。预计将与3M公司密切合作，在工业环境中实施这项研究的结果。在EPSCoR州建设研究基础设施：这项建议将有助于田纳西州可持续研究基础设施的进一步发展，包括(I)培训学生，(Ii)发展德克萨斯大学的专业知识，以及(Iii)加强UTK、斯坦福大学和丹麦技术大学之间的研究网络。

National Science Foundation - Division of Chemical &Transport Systems Particulate & Multiphase Processes Program (1415)Proposal Number: 0651497Principal Investigators: Khomami, BaminAffiliation: University of Tennessee, KnoxvilleProposal Title: Interfacial Dynamics in displacement Flows of Entangled Polymeric FluidsIntellectual MeritDisplacement flows are omnipresent in a broad class of multiphase flows and are of tremendous practical application in many fields such as gas assisted injected molding, enhanced oil recovery, production of hollow fiber membranes and coating of substrates. The proposed work will integrate advances in polymer physics, viscoelastic fluid mechanics and computational science to develop a mechanistic understanding of interfacial dynamics in displacement flows of linear and branched polymeric melts. The intellectual merits of the proposed activities include: Comprehensive experimental investigation of the influence of polymer concentration and architecture on the interfacial dynamics of prototypical air-fluid displacement flows. Direct simulation of the interfacial instability of prototypical air-fluid displacement flows of linear and branched entangled polymeric solutions. Determination of the influence of thermal effects (i.e., coupling of viscous heating and the thermal sensitivity of the fluid) on interfacial dynamics of prototypical air-fluid displacement flows of linear and branched entangled polymeric solutions. The proposed research will result in development of experimentally validated hi-fidelity process simulation tools for industrially relevant processes - a field where computational tools are desperately needed to rationalize the design and operation of net shape liquid state processes for commodity and value added products. Broader Impacts The success of present and future technologies and their potential to improve our quality of life depend largely on the creation of a workforce that is well equipped to tackle modern science and engineering challenges. One of our main objectives is to develop a system of instruction, through both classroom and laboratory experiences, for training graduate and undergraduate students in computational material science and engineering. In the past decade, U.S. graduates at all levels of education have significantly fallen behind their European counterparts in this area. Hence, the proposed research/educational program is essential and timely. Diversity and Outreach: Various programs at the University of Tennessee, Knoxville (UTK), e.g., NSF-supported TLSAMP, Pipeline Engineering Diversity Program and GEM will be used to ensure participation of African-American, Hispanic-American, Native-American and female students in this research. We will also utilize the extensive outreach infrastructure at UTK to involve K-12 teachers and high school students in the research program. Internet Based Dissemination: The simulation module, experimental database, technical publications and presentations stemming from this research will be placed on an actively maintained web page. Middleware will be used for web-based execution of the simulation module and data visualization. Industrial Interactions: The coating Industry fully recognizes the value of the proposed research. A close collaboration with 3M Corporation in implementation of the results of this research in an industrial setting is envisioned. Building Research Infrastructure in an EPSCoR State: This proposal will contribute to the further development of a sustainable research infrastructure in Tennessee, in terms of (i) training students, (ii) developing expertise at UT and (iii) strengthening the research network between UTK, Stanford and Danish Technical University.