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2002 Fiscal Year Final Research Report Summary

STUDY OF BIFURCATION OF ROTATING FLOW IN A CLOSED SPACE AND ITS EFFECTS ON THE PARTICLE MOTION IN THE FLOW

Research Project

Project/Area Number 13650198
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionMEIJO UNIVERSITY

Principal Investigator

NAKAMURA Ikuo  MEIJO UNIVERSITY, PROFESSOR, 理工学部, 教授 (00023127)

Co-Investigator(Kenkyū-buntansha) WATANABE Takashi  NAGOYA UNIVERSITY, CENTER FOR INFORMATION MEDIA, CENTER PROF., 情報メディア教育センター, 教授 (40182927)
Project Period (FY) 2001 – 2002
KeywordsROTATING FLOW / ROTATING DISC / COMPUTATIONAL FLUID DYNAMICS / REYNOLDS NUMBER / PARTICLE MOTION / VISUALIZATION
Research Abstract

Rotating flow field is important for pure fluid mechanics but also for engineering problems and environmental problems. As a rotating flow paradigm, flow field in a closed vessel are investigated many years from various points of view but still many questions are remained to be clarified. In this research, two types of rotating flow are studied, one is Benjamin flow, that is Taylor vortex flow in finite length and the another is rotating disc flow. For Benjamin flow, we studied using numerical and experimental methods. Specifically, Nonlinear development of flow patterns in the case of decelerating cylinder is carefully calculated and details of bifurcation process is obtained. The comparison is made between an experiment, and the calculated results and excellent agreement is obtained. But in some cases bifurcation process is more complicated in the experiment. An important controversial point is to determine the flow pattern objectively from the computed results. We constructed a program which can clarify complicated formation process of Taylor vortex using artificial intelligence technique so we can classify various flow pattern without subjective knowledge. As the first step to analyze the motion of particles in rotating flow, an orbit of fluid particle is pursued using Runge Kutta scheme of which is written in JAVA and convenient GUI system is constructed. An experimental facility is made for flow visualization for the flow induced by a rotating disc in an enclosure. Aluminum powder method is used for visualization and flow field photographed by video camera recorder and analyzed by a graphic software. Regimes of flow field are classified according to increasing Reynolds number defined by the diameter of the rotating disc and peripheral velocity of it.

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Y.Toya, I.Nakamura: "Instability of Two-Fluid Taylor Vortex Flow in the Case of An Asymmetric System"Proc. 12th Int. Couette-taylor Workshop IL USA. 2C-1. 1-4 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Watanabe, H.Furukawa, I.Nakamura: "Nonlinear development of flow patterns in an annulus with decelerating inner cylinder"Physics of Fluids. Vol.14,No.1. 333-341 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Furukawa, T.Watanabe, Y.Toya, T.Nakamura: "Flow pattern exchange in the Taylor-Couette system with a very small aspect ratio"Physical Review E, Part2 of B. Vol.65,No.3-2B. 036306-036306-7 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Umemura, T.Watanabe, H.Furukawa, I.Nakamura: "Visual Numerical Three-Dimensional Flow Development between Very Short Rotating Cylinders"Proc. 10th Int. Symp. on Flow Visualization, Aug. 26-29 Kyoto. F0095(CD-ROM). 1-10 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 古川裕之, 渡邉 崇, 中村育雄: "アスペクト比が小さい場合のテイラー渦流れ (変異・正規モード間の流動形態変化と非定常モードの遷移過程)"日本機械学会論文集(B編). 68巻・674号. 2671-2678 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Y. Toya and I. Nakamura: "Instability of Two-Fluid Taylor Vortex Flow in The Case of An Asymmetric System"Proc. 12^<th> Int. Couette-Taylor Workshop, Evanston IL USA. 2C-2. 1-4 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Watanabe, H. Furukawa and I. Nakamura: "Nonlinear development of flow patterns in an annulus with decelerating inner cylinder"Physics of Fluid. Vol. 14-1. 333-341 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H. Furukawa, T. Watanabe, Y. Toya and I. Nakamura: "Flow pattern exchange in the Taylor-Couette system with a very small aspect ratio"Physical Review E, Part 2 of B. Vol. 65-3-2R. 036306-1-036306-7 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N. Umemura, T. Watanabe, H. Furukawa and I. Nakamura: "Visual Numerical Three-Dimensional Flow Development between Very Short Rotating Cylinders"Proc. The 10^<th> Int. Symp. on Flow Visualization, Aug.26-29, Kyoto. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T. Watanabe, H. Furukawa and I. Nakamura: "Taylor Vortex Flow at Very Small Aspect Ratio (Flow Pattern Exchange from Anomalous Mode to Normal Mode and bifurcation Process of Unsteady Mode) (in Japanese)"Trans. JSME. Vol. 68-674. 2671-2678 (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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