In order to reveal the nature of turbulence in a lung, the measurements of turbulence in the oscillatory flow in a model of bronchial bifurcation were made by a two-colour laser-Doppler velocimeter. Experiments were performed for the Reyonolds number from 1 100 to 10 000, and for the frequency parameter from 3 to 10. The spatial and temporal variation of turbulence were strongly dependent on the secondary flow structure generated by the branch. It was also found that as the frequency parameter became larger, the transition Reynolds number became smaller compared with that for the straight tube.
|ジャーナル||Nippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B|
|出版ステータス||Published - 2004 8月|
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