円管内等加速度流れの臨界レイノルズ数

DOI Web Site 被引用文献3件 参考文献11件

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タイトル別名
  • Critical Reynolds Number in Constant-Acceleration Pipe Flow
  • エンカンナイ トウカソクド ナガレ ノ リンカイ レイノルズスウ

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Experimental investigation has been carried out to understand the transition to turbulence in constant-acceleration pipe flow. A fluid initially at rest in a circular pipe is accelerated at a constant acceleration. The transition to turbulence is judged on the basis of the output signal of a hot-wire anemometer or laser Doppler velocimetry in addition to flow visualization. The critical Reynolds number,Retr(=umD⁄v), is highly increased beyond that of approximately 3000 in steady pipe flows, where um is the cross-sectional mean velocity, D is the pipe diameter, and v is the kinematic viscosity of fluid. The following empirical equation is proposed for the critical Reynolds number.Retr=1.33[D(a⁄v2)1⁄3]1.86 where a is the acceleration.

収録刊行物

  • 実験力学

    実験力学 7 (2), 142-147, 2007

    日本実験力学会

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