U.S.-Japan Cooperative Science: A Computational Study of Bubble and Drop Dynamics in Inelastic and Viscoelastic Non-Newtonian Fluid Systems

该奖项支持佛罗里达州立大学Mark Sussman教授和日本北海道Muroran理工学院Mitsuhiro Ohta教授之间为期两年的国际合作研究项目。他们将在非弹性和粘弹性非牛顿流体系统中进行气泡和滴动力学的计算研究。研究人员提出将牛顿多相流中复杂移动边界问题的数值方法推广到非牛顿多相流中，并在软件中实现方法，结合相关实验对流动进行计算模拟。这些问题在工业中很重要。例如，模拟微尺度喷射装置（如喷墨装置）中流体的破裂，模拟提取过程中气泡和液滴的结合，以及模拟挤压过程。数值验证研究和与实验的比较将用于检验非牛顿本构关系的有效性。该项目汇集了两个具有互补专业知识和研究能力的实验室的努力。美国研究人员提供数值分析方面的专业知识，日本研究人员提供实验领域的专业知识。喷射和挤压过程的全尺寸、三维、直接数值模拟将直接适用于喷墨打印机和纤维纺丝设备的设计，并为非牛顿流体的流动不稳定性和界面形态提供有价值的见解。该项目通过一些研究生的参与促进了国际人力资源的发展。通过思想和技术的交流，该项目将扩大我们的基础知识基础，促进国际了解与合作。研究结果将在科学会议和科学计算、非牛顿流体力学和化学工程方面的科学期刊上传播。

0242524SussmanThis award supports a two-year international collaborative research project between Professor Mark Sussman at Florida State University and Professor Mitsuhiro Ohta of the Muroran Institute of Technology in Hokkaido, Japan. They will undertake a computational study of bubble and drop dynamics in inelastic and viscoelastic non-Newtonian fluid systems. The researchers propose to extend numerical methods for complex moving boundary problems in Newtonian multi-phase flow to non-Newtonian multi-phase flows, implement the methods in software, and conduct computational simulations of the flows in the light of relevant experiments. These problems are important in industry. For example, modeling the break-up of fluids in microscale jetting devices (e.g. ink-jet devices), modeling coalescence of bubbles and drops in extraction processes, and modeling extrusion processes. Numerical validation studies and comparison with experiments will be used to test the validity of non-Newtonian constitutive relations. The project brings together the efforts of two laboratories that have complementary expertise and research capabilities. The U.S. researchers provide expertise in numerical analyses and the Japanese researchers provide expertise in the experimental areas. The full scale, three dimensional, direct numerical simulations of jetting and extrusion processes will have direct applicability in the design of ink-jet printers and fiber spinning apparatus and provide valuable insight into the flow instability and interfacial morphology of the non-Newtonian fluids. The project advances international human resources through the participation of a number of graduate students. Through the exchange of ideas and technology, this project will broaden our base of basic knowledge and promote international understanding and cooperation. Results of the research will be disseminated at scientific meetings and in scientific journals on scientific computing, non-Newtonian fluid mechanics and chemical engineering.