軸方向に流れのある回転二重管の回転抵抗

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タイトル別名
  • Torque Resistance of the Flow between Rotating Co-Axial Cylinders Having Axial Flows
  • ジク ホウコウ ニ ナガレ ノ アル カイテン 2ジュウカン ノ カイテン テイコウ

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抄録

The writer measured the torque between co-axial cylinder walls exerted by the water flow when the inner cylinder rotates. Furthermore, the writer carried out experiments on the co-axial cylinders having circumferential grooves on its inner cylinder surface. The results obtained are as follows : 1) When the grooves and the axial flow are absent, the torque coefficient Cf increases as the clearance between two cylinders increases, and when the peripheral Reynolds number Rω is large, the clearance has little effect on the value of Cf. 2) The axial flow extends the range of laminar state of Rω, where the value of Cf decreases, but when the axial flow increases beyond that range the value of Cf increases again. 3) When there are grooves on the cylinder, it becomes difficult to keep the flow laminar, so that the torque does not decrease with the increase of the axial flow.

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