The Turbulent Shear Flow on a Rotating Cylinder in a Quiescent Fluid : Flow Visualization and the Scale of Lump of Eddies

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概要

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• An experimental study has been performed on the structure of a turbulent flow around a cylinder spinning in a quiescent fluid. The visualization using smoke wires and the method of thermal tuft have revealed that the reverse flow occurs not in the internal region but in the external regions of the layer. The reverse flow occurs in the same regions as the eddies which can be generated by scattering aluminum powder. It has been found that the eddies displayed in a picture of aluminum powder, which was taken by a rotating camera, grow larger and larger in proportion to the distance from the cylinder. Also the mixing length increases. The radial length of eddies almost agrees with the mixing length. Furthermore, the turbulent diffusion of the instantaneous spot of a dropped dye has been examined. The examination shows that the scale of diffusion has a strong correlation with that of the peripheral length of eddies.

• 一般社団法人日本機械学会の論文

著者

• YAMASHITA Shintaro

  Department of Mental Retardation and Birth Defect Research, National Institute of Neuroscience, Nati

• NAKAMURA Ikuo

  Department of Mechanical Engineering, Nagoya University

• Nakamura I

  Department Of Mechanical Engineering Nagoya University

• Nakamura Ikuo

  Nagoya University

• Yamashita Shintaro

  Gifu University

• Yamashita Shintaro

  Department Of Mechanical Engineering Nagoya University

• Nakamura I

  Nagoya Univ. Nagoya

• Nakamura I

  Chiba Univ. Chiba Jpn

• UEKI Yoshinori

  Nagano National College of Technology

• UEKI Yoshinori

  Department of Mechanical Engineering, Nagano National College of Technology

• Nakamura Ikuo

  Department Of Applied Physics Faculty Of Engineering University Of Tokyo

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