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小孔を通過する流れに関する研究(第2報, 速度場に関する実験)

フォーマット:
論文(リポジトリ)
責任表示:
福冨, 清 ; 長谷川, 富市 ; 中野, 裕二 ; 鳴海, 敬倫
出版情報:
日本機械学会, 1987-12
掲載情報:
日本機械学会論文集. B編 = 日本機械学会論文集. B編
ISSN:
03875016  CiNii Articles  Webcat Plus  JAIRO
著者名:
巻:
53
通号:
496
開始ページ:
3516
終了ページ:
3521
バージョン:
publisher
概要:
The velocity field of an inlet and outlet flow through small orifices was experimentally examined. The velocity along the center line near the orifices was measured with a laser doppler anemometer, stream lines in the whole flow region were photographed, and the following points were clarified : (1) The center line velocities of liquid paraffin agree with the theoretical value of Stokes flow in the region of Reynolds numbers below 10. (2) With distilled water, a diverging angle of the issuing flow from a larger orifice is smaller than that of the issuing flow from a smaller orifice. Furthermore, a characteristic isolated vortex is generated on the downstream side of the orifice at the Reynolds number of from 10 to 30. (3) With ethanol used as a test liquid, the diverging angle of the issuing flow is small even for the Reynolds number of less than 10, and the flow resembles a jet. (4) The magnitude of the diverging angle of the issuing flow have a decisive effect on the value of the excess pressure drop at the same Reynolds number ; the larger the diverging angles is, the smaller the excess pressure drop is. (5) The dimension of the isolated vortex generated with the outlet flow of water is, when non-dimensionalized with the orifice diameter, correlated with a dimensionless number V(λ/ν)^<1/2>, where V is the mean orifice velocity, λ is a time proper to water and ν is the kinematic viscosity. 続きを見る
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