水素気泡をトレーサーとした円管内乱流流体界面の変位・伸長過程の測定

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  • Measurements of Displacement and Elongation Process of a Material Interface in a Turbulent Pipe Flow by Use of Hydrogen Bubble Tracer.
  • スイソ キホウ オ トレーサー ト シタ エンカンナイ ランリュウ リュウタ

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Hydrogen bubbles were generated continuously from an electrode wire strained along the pipe diameter in order to investigate the turbulent deformation process of a fluid material interface in a turbulent pipe flow. The hydrogen bubbles behaved like a curtain hung on the electrode wire and can be regarded as tracers marking an interface of two fluids divided by the diameter electrode. Influences of wall turbulence on the behavior of the hydrogen bubble curtain are described using the light-and-shade patterns on its side-view images. The end-view images were processed on a personal computer to quantitatively determine the turbulent displacement and elongation process of a material interface in terms of the intensity, integral scale, eddy diffusivity and elongation rate of the fluctuating hydrogen bubble curtain.

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