Radial Propagation of Turbulence in Pulsatile Pipe Flow

• IGUCHI M.

  Faculty of Engineering, Osaka University

• MIURA Hiroshi

  Sumitomo Special Metals Co. Ltd.

抄録

Turbulence generated near the wall of a pipe propagates in both the radial and the axial directions. Compared to axial propagation, knowledge of radial propagation is very limited. This investigation is intended to clarify the radial propagation of wall turbulence in pulsatile turbulent pipe flows. It becomes evident that the turbulence is mainly generated around y^+=20 and propagates toward the wall as well as the pipe center, where y^+=yu^^-_<*,ta>/ν, y the distance from the wall, u^^-_<*,ta> the time-averaged friction velocity, and ν the kinematic viscosity. The propagation time near the generation region scales well with inner variables, u^^-_<*,ta> and ν, whereas in the central part of the pipe it scales with u^^-_<*,ta> and the pipe radius R. Empirical expressions for the propagation time are derived, and models for Reynolds shear stress and eddy viscosity are proposed.

収録刊行物

• JSME International J, Ser. II

  JSME International J, Ser. II 32 (2), 173-, 1989

  一般社団法人日本機械学会

キーワード

• Unsteady Flow
• Pulsatile Pipe Flow
• Propagation of Turbulence
• Reynolds Shear Stress
• Eddy Viscosity

詳細情報

• CRID: 1570572702200509184
• NII論文ID: 110002494250
• NII書誌ID: AA10680596
• ISSN: 09148817
• 本文言語コード: en
• データソース種別:
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