NSF-CGP Science and Engineering Fellows Program: Investigation of Thermal and Fluid Dynamic Phenomena for Design of Cryogenic Pulse Tube Cooler Components

9522968 Kudaravalli该提案支持加州大学洛杉矶分校化学工程系的Ravikumar Kudaravalli博士和日本大学千叶原子能研究所（AERI）的Yoichi Matsubara教授的合作。项目资金将使Kudaravalli博士在日本日本大学居住一年，以研究低温脉冲管冷却器组件设计的热和流体动力学现象，以获得最佳性能。Kudaravalli博士此前研究了各种低温系统的传热、流体动力学和热力学方面，以及低温冷却器的热交换器和蓄热器，特别是脉管冷却器。Matsubara教授是脉管制冷机领域的主要研究人员之一。他通过多级冷却器和再生管的发明进一步推动了这项技术。Matsubara教授演示的液氦温度（3.6 K）是脉冲管制冷机产生的最低温度记录。Kudaravalli博士将结合他与Matsubara教授的专业知识，研究低温脉冲管冷却器的热和流体动力学现象，以实现最佳性能。这项提议汇集了两国在先进低温冷却器技术领域工作的研究科学家。美国科学家将有机会熟悉AERI的研究技术、设备和设施，同时为整体研究工作做出贡献。因此，该提案通过国际合作实现了该计划在科学知识交流和转移方面的目标。＊＊＊

9522968 Kudaravalli This proposal supports the collaboration of Dr. Ravikumar Kudaravalli of the Department of Chemical Engineering at the University of California, Los Angeles and Professor Yoichi Matsubara of the Atomic Energy Research Institute (AERI) at the Nihon University, Chiba. Project funding will enable Dr. Kudaravalli to spend one year in Japan, resident at Nihon University, in order to investigate the thermal and fluid dynamics phenomena for design of cryogenic pulse tube cooler components for optimum performance. Dr. Kudaravalli has previously investigated the heat transfer, fluid dynamics and thermodynamic aspects of various cryogenic systems in general and heat exchangers and regenerators of cryocoolers including pulse tube coolers in particular. Professor Matsubara is one of the leading researchers in the pulse tube cryocooler area. He has pushed the technology further by multistaging of the cooler and by invention of the regenerative tube. Professor Matsubara's demonstration of liquid helium temperatures (3.6 K) is the record low temperature ever produced by a pulse tube cryocooler. Dr. Kudaravalli will combine his expertise with that of Professor Matsubara to study the thermal and fluid dynamics phenomena in cryogenic pulse tube coolers achieving optimum performance. This proposal brings together research scientists from two countries working in the area of advanced cryogenic cooler technology. The U.S. scientist will have the opportunity to become familiar with research techniques, equipment and facilities at AERI while contributing to the overall research effort. Therefore, this proposal fulfills the objectives of the program in its exchange and transfer of scientific knowledge through an international collaboration. ***