U.S. - Japan Seminar on Two-Phase Flow Dynamics, June 6-12, 2012, Tokyo, Japan

项目简介拟议的美日两相流动动力学研讨会将汇集两国在两相流动和传热研究领域的年轻研究人员和成熟研究人员。多相流和相关的热传递发生在各种各样的工业过程中，在能源产生和转换系统、化学反应堆、石油回收和精炼系统以及核反应堆系统等中至关重要。在机械、化学、石油、核、航空航天、电气和环境等许多工程学科中，它们也是重要的研究对象。目的：研讨会的主要目的是为与会者提供一个机会，就这一重要而普遍的现象的研究现状、当前挑战和未来方向进行深入讨论。两国研究人员之间的互动将导致合作研究项目的发展，有利于该领域的发展，并汇集两国的智力资源，以规划未来的研究方向。研讨会将讨论的主题包括多尺度建模和验证。随着多相流模拟的新工具的发展，对这些主题的深入讨论是必不可少的。智力优势：多相流的物理学是极其复杂的，早期的研究导致了经验相关性的公式。然而，当这些相关性被应用于超出相关发展的参数范围的情况时，这些相关性总是表现不佳。随后的努力产生了机制模型，这种模型也依赖于经验常数来关联数据。最近取得的进展是在使用适当的边界和界面条件求解守恒方程的同时数值模拟这一现象。这些最近的进展增加了将结果扩展到原型的信心。最近的进展也导致在纳米，微观和宏观尺度模型的制定。然而，在几个长度尺度上缩放现象仍然不是一个解决的问题。在能源生产和转换系统中，减少温室气体排放是一个紧迫的目标，可以通过制定不依赖化石燃料的替代能源生产战略来实现。核能就是这样的一个选择，因此正在经历复兴，然而，最近在日本福岛第一核电站发生的事故突出了我们需要提高我们对冷却剂流动和热传递的理解，在受损反应堆堆芯和乏燃料舱内的复杂流动通道中。讨论会的独特之处在于所有与会者之间将进行的深入讨论。与讨论不同主题的其他会议和研讨会不同，本次研讨会侧重于在众多应用中当前和未来重要的特定主题。两国研究人员之间的深入讨论将导致合作，这将对推进两相流和传热领域产生持久的影响。初级研究人员将通过与国内/国际公认的高级和受人尊敬的技术社区成员的互动，在智力上受到挑战和刺激。

PI: Masahiro Kawaji, City College of New YorkProposal Number: CBET-1155673Project SummaryThe proposed U.S.-Japan Seminar on Two-Phase Flow Dynamics will bring together young researchers and well established researchers from the two countries in the area of two-phase flow and heat transfer research. Multiphase flow and associated heat transfer occur in a wide variety of industrial processes and are of critical importance in energy generation and conversion systems, chemical reactors, oil recovery and refining systems, and nuclear reactor systems, among others. They are also important subjects to study in many engineering disciplines such as mechanical, chemical, petroleum, nuclear, aerospace, electrical, and environmental.Objective: The key objective of the seminars is to provide an opportunity for the participants to carry out in-depth discussions on the state of the art of the field, current challenges, and future directions for research on this important and pervasive phenomenon. The interactions amongst researchers from the two countries will lead to development of co-operative research programs beneficial to the advancement of the field and to pooling of intellectual resources of the two countries in charting the direction of future research. Topics to be considered at the seminars include multi-scale modeling and validation. A thorough discussion of these topics is essential as new tools are developed for simulation of multiphase flows.Intellectual Merit: The physics of multiphase flows is extremely complex and early investigations lead to formulation of empirical correlations. However, these correlations invariably did not fare well when applied to situations beyond the range of parameters over which the correlations had been developed. Subsequent efforts lead to mechanistic models which also relied on empirical constants to correlate the data. More recently advances have been made to numerically simulate the phenomena while solving conservation equations using appropriate boundary and interfacial conditions. These recent advances have increased confidence in extending the results validated with scaled systems to prototypes. Recent advances have also lead to formulation of models at nano, micro, and macroscale. However, scaling of the phenomena over several length scales is still not a resolved issue.In energy generation and conversion systems, the reduction of greenhouse gas emission is an urgent goal which can be achieved by developing alternative energy generation strategies that do not depend on fossil fuels. Nuclear energy is one such option and consequently is experiencing a renaissance, however, a recent accident at Fukushima Daiichi Nuclear Generating Station in Japan has highlighted a need to improve our understanding of coolant flow and heat transfer in complex flow channels inside a damaged reactor core and spent fuel bay.The uniqueness of the seminars is in the in-depth discussions that would take place among all the participants. Unlike other meetings and workshops where diverse topics are discussed, this seminar focuses on specific topics of current and future importance in multitudes of applications. The in-depth discussions amongst researchers of the two countries will lead to collaboration that will have lasting impact in advancing the field of two-phase flow and heat transfer. Junior researchers will be intellectually challenged and stimulated through interactions with nationally/internationally recognized senior and well respected members of the technical community.