Research for flow behavior in various bifurcated channels

对具有不同分叉构型的通道内的流动行为进行了研究。这项研究的目的是特别考虑到实现基本的工程意义以及获得流体力学的基本知识。整个研究由主要进行实验的山口监督和控制，与水岛合作进行数值计算。在研究的开始阶段，主要致力于研究简单的二维收缩流道中的流动基本特性。从研究结果可知，流动转变模式存在相当丰富的结构，这些结构是由实验获得并经数值分析验证的。进一步了解到，从工作中获得的结果将对自然对流、球隙流动等流动现象提供许多类似的见解。在此基础上，从工程应用的角度进一步研究了实际复杂的流道构型。得到了大量的结果，包括反射流模式、振荡流模式和许多其他流动模式，这些模式被认为对流道设计具有重要的工程应用价值。本研究成果已在19篇论文中发表在期刊上，并向公众开放。

A research was conducted to investigate flow behavior in a channel with various bifurcated configurations. The research was aimed particularly in consideration of achieving fundamental engineering significancy as well as obtaining basic knowledge in fluid mechanics. The total research was supervised and controlled by Yamaguchi, who carried out experimentation chiefly, and was collaborated with Mizushima, who did numerical works.In beginning stage of this research, major efforts were made so as to investigate basic characteristics of flow in a simple two-dimensional contracted flow channel. From results of the investigation, it was known that there exists quite rich structures of flow transition modes, which were obtained from experiments and verified by numerical analysis. It was further understood that results obtained from the works would give many analogous insights toward flow phenomena, such as natural convection, spherical gap flow and so on. The work was then extended to investigate further realistic and complicated flow channel configurations in view of engineering application. Substantial amount of results were gained, showing reflection flow mode, oscillatory flow mode and many other flow modes, which were understood as very important for engineering application in designing flow channels. Results obtained from the present research were already published in 19 papers in journals, and the works were opened for public.