イワツ　レイマ   IWATSU Reima   岩津　玲磨    所属   東京電機大学  工学部 機械工学科    東京電機大学大学院  先端科学技術研究科 機械システム工学専攻    東京電機大学大学院  工学研究科 機械工学専攻    職種   教授
言語種別	英語
発行・発表の年月	2019
形態種別	国際会議論文
査読	査読有り
標題	Unsteady vortex breakdown phenomena in an enclosed cylindrical container with a rotating disk
執筆形態	共著
掲載誌名	Proc. ASME-JSME-KSME 2019 Joint Fluids Engineering Conference
掲載区分	国外
出版社・発行元	ASME
巻・号・頁	AJK2019-4751
総ページ数	10
著者・共著者	Yuki NAKATSUKA, Reima IWATSU, Jae Min Hyun, Hide S. KOYAMA
概要	A high-quality precision-controlled turntable apparatus was fabricated to probe the dynamic behavior of a viscous fluid contained in a cylindrical container. Vortex breakdown(s) produced by a rotating endwall disk was visualized by using a fluorescent dye injection technique, and its flow field was measured by using a particle image velocimetry. Limiting boundaries for single, double and triple vortex breakdowns in steady flow were re-plotted to compare with the previous visualization studies of Escudier. The locations of stagnation points of the vortex breakdown bubble(s) in steady flow were measured quantitatively. In unsteady flow, the amplitude and time period of periodic axial oscillation, and the polar angle and time period of precession, were measured. The domains for periodic axial oscillation and for precession in unsteady flow were delineated.