軸方向に流れのある回転二重管の回転抵抗

概要

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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 C_f increases as the clearance between two cylinders increases, and when the peripheral Reynolds number R_ω is large, the clearance has little effect on the value of C_f. 2) The axial flow extends the range of laminar state of R_ω, where the value of C_f decreases, but when the axial flow increases beyond that range the value of C_f 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.
一般社団法人日本機械学会の論文
1962-02-25