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
発表年月日	2019/07
発表テーマ	UNSTEADY VORTEX BREAKDOWN PHENOMENA IN AN ENCLOSED CYLINDRICAL CONTAINER WITH A ROTATING ENDWALL DISK
会議名	ASME-JSME-KSME 2019 Joint Fluids Engineering Conference AJKFLUIDS2019
主催者	ASME
学会区分	国際学会
発表形式	口頭（一般）
単独共同区分	共同
開催地名	San Francisco, CA, USA
発表者・共同発表者	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. This flow is characterized by two non-dimensional parameters, i.e., the height-to-radius ratio H/R and the rotating Reynolds number Re = ΩR2/ν. 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. The overall experimental results in the steady flow were in excellent agreement with Escudier's data.