Investigation of the flow behavior and fluid body force around an arm inserted into a flow driven by rotating disks mounted in an enclosure

• Project/Area Number: 26820048
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering
• Research Institution: Kobe University
• Principal Investigator: SHIRAI KATSUAKI 神戸大学, 先端融合研究環, 助教 (00634916)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2016: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000); Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2014: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
• Keywords: 回転流 / 容器内流れ / PIV計測 / 屈折率整合 / コリオリ力 / ハードディスクドライブ / 流体機械 / 情報ストレージ機器 / 積層円盤による回転流れ / 非軸対称容器内の流れ / 流体力 / 流れの可視化 / 粒子画像流速計（PIV計測） / 渦運動 / 2次流れ / 回転流れ / 画像粒子流速計 / 乱流 / せん断 / 流体関連振動

Outline of Final Research Achievements

In the experiment, measurement system was built to investigate the flow velocity fields based on particle image analysis in a transparent experimental model with refractive index matched working fluid. The resulting velocity fields in the planes parallel to the disk surfaces revealed the mechanism of complex behavior of the flow undergoing acceleration and deceleration during the disk revolution. The flow velocities were found to locally exceeded that of the solid body rotation of the disks. The acceleration and deceleration are attributed to the arm insertion and shroud opening. The acceleration and deceleration induced by these factors occur separately in different flow areas. Numerical simulation of the unsteady flow was performed using the configuration identical to that of the experiment. Validity of the simulation was analyzed through the comparison of the results with the experimental ones. The results indicate that the simulation may supplement the experiment in certain extent.

Research Products

• [Int'l Joint Research] サンタクララ大学（Santa Clara University）(米国）
• [Presentation] 非軸対称エンクロージャ内で積層回転円盤に駆動される複雑流れに関する研究 (2017)
  • Author(s): 辰巳裕亮，白井克明，川南剛，平澤茂樹
  • Organizer: 日本機械学会 No.17-10 IIP2017情報・知能・精密機器部門（IIP部門）講演会
  • Place of Presentation: 東京：東洋大学白山キャンパス
  • Year and Date: 2017-03-14
• [Presentation] 非軸対称容器内で積層回転円盤に駆動される複雑流れの速度挙動 (2016)
  • Author(s): 白井克明，石村尚平，川南剛，平澤茂樹
  • Organizer: 日本機械学会 第94期流体工学部門講演会
  • Place of Presentation: 宇部：山口大学工学部
  • Year and Date: 2016-11-12
• [Presentation] Complex behavior of a rotating flow driven by corotating disks mounted in a non-axisymmetric enclosure (2016)
  • Author(s): Katsuaki Shirai, Shohei Ishimura, Tsuyoshi Kawanami, Shigeki Hirasawa
  • Organizer: Euromech 11th European Fluid Mechanics Conference
  • Place of Presentation: Barceló Renacimiento Hotel, Seville, Spain
  • Year and Date: 2016-09-12
  • Int'l Joint Research
• [Presentation] 非軸対称容器内の積層回転円盤による流れの解明（粒子画像計測に基づく円盤領域の流れ挙動） (2016)
  • Author(s): 白井克明、石村尚平、川南剛、平澤茂樹
  • Organizer: No.16-12, IIP2016 日本機械学会 情報・知能・精密機器部門（IIP 部門）講演会
  • Place of Presentation: 東洋大学白山キャンパス（東京）
  • Year and Date: 2016-03-14
• [Presentation] 非軸対称エンクロージャ内の回転積層円盤による複雑流れの可視化実験と速度場計測 (2015)
  • Author(s): 石村尚平、白井克明、川南剛、平澤茂樹
  • Organizer: 日本機械学会 第93期流体工学部門講演会
  • Place of Presentation: 東京理科大学 葛飾キャンパス（東京）
  • Year and Date: 2015-11-07
• [Presentation] 非軸対称エンクロージャ内の積層回転円盤に駆動される複雑流れのPIVによる速度場定量評価 (2015)
  • Author(s): 石村尚平、白井克明、川南剛、平澤茂樹
  • Organizer: 可視化情報全国講演会2015
  • Place of Presentation: 京都工芸繊維大学 松ヶ崎キャンパス（京都）
  • Year and Date: 2015-10-10
• [Presentation] Experimental Study on the Complex Flow in a Transparent Model of Hard Disk Drive (2015)
  • Author(s): Shohei Ishimura, Katsuaki Shirai, Tsuyoshi Kawanami, Shigeki Hirasawa
  • Organizer: Experimental Study on the Complex Flow in a Transparent Model of Hard Disk Drive”, 26th International Symposium on Transport Phenomena (ISTP-26)
  • Place of Presentation: Montanuniversitaet Leoben, Leoben, Austria
  • Year and Date: 2015-09-27
  • Int'l Joint Research
• [Presentation] On the Global Behavior of the Flow Field in a Transparent Experimental Model of a Hard Disk Drive (2015)
  • Author(s): Shohei Ishimura, Katsuaki Shirai, Ryo Tada, Tsuyoshi Kawanami, Shigeki Hirasawa
  • Organizer: GALA 23. Fachtagung “Lasermethoden in der Stroemungsmesstechnik” (GALA2015)
  • Place of Presentation: Technische Universitaet Dresden, Dresden, Germany
  • Year and Date: 2015-09-08
  • Int'l Joint Research
• [Presentation] Flow Visualization and Velocity Field Measurement inside a Refractive-Index Matched Transparent Model of a Hard Disk Drive (2015)
  • Author(s): Shohei Ishimura, Katsuaki Shirai, Ryo Tada, Tsuyoshi Kawanami, Shigeki Hirasawa
  • Organizer: 2015 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment
  • Place of Presentation: 神戸
  • Year and Date: 2015-06-14 – 2015-06-17
• [Presentation] Flow Visualization and Velocity Field Measurement inside a Refractive-Index Matched Transparent Model of a Hard Disk Drive (2015)
  • Author(s): Shohei Ishimura, Katsuaki Shirai, Ryo Tada, Tsuyoshi Kawanami, Shigeki Hirasawa
  • Organizer: 2015 JSME-IIP/ASME-ISPS Joint Conference on Micromechatronics for Information and Precision Equipment (MIPE2015),
  • Place of Presentation: 神戸国際会議場（神戸）
  • Year and Date: 2015-06-14
  • Int'l Joint Research
• [Presentation] 非軸対称エンクロージャ内の積層回転ディスクによる複雑せん断流れの解明 (2015)
  • Author(s): 白井克明、多田遼、石村尚平、川南剛、平澤茂樹
  • Organizer: 日本伝熱学会第52 回日本伝熱シンポジウム
  • Place of Presentation: 福岡国際会議場（博多）
  • Year and Date: 2015-06-03
• [Presentation] Experimental Study on the Internal Rotating Flow Driven by a pair of Rotating Disks in a Non-Axisymmetric Enclosure (2014)
  • Author(s): Katsuaki Shirai, Ryo Tada, Tsuyoshi Kawanami, Shigeki Hirasawa
  • Organizer: EUROMECH 10th European Fluid Mechanics Conference
  • Place of Presentation: Copenhagen, Denmark
  • Year and Date: 2014-09-14 – 2014-09-18
• [Presentation] 非軸対称エンクロージャ内の積層回転ディスクによる複雑せん断流れの可視化を用いた解明 (2014)
  • Author(s): 白井克明、多田遼、川南剛、平澤茂樹
  • Organizer: 日本機械学会2014年度年次大会
  • Place of Presentation: 東京
  • Year and Date: 2014-09-07 – 2014-09-10