On the Frictional Resistance of Enclosed Rotating Cones : 2nd Report, Effects of Surface Roughness

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概要

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• The effects of surface roughness on the frictional moment of a rotating cone were investigated experimentally, when the cone was rotated in a casing of which conical surface was parallel to that of the rotating cone. Torque measurement was made for six vertex angles θ, from 30° to 180°. Results obtained are as follows. (1) The roughness of the rotating conical surface has a stronger effect on the frictional moment than that of a stationary one, and this trend is marked at large clearance ratio s'/R. (2) When the roughness of the rotating conical surface is equal to that of the stationary one, the moment coefficient C_M is independent of the Reynolds number R_e at sufficiently large R_e, namely within a completely rough regime. (3) In the completely rough regime, the C_M-values for θ<_= 120° are larger than those for θ>_= 150° at a relatively small s'/R. This difference of C_M due to θ increases as the relative roughness k/R increases. (4) Within the completely rough regime, C_m is found to be expressed by the formula C_M = {Alog(R/k)+B}^<-2> where A and B depend on θ and s'/R.

• 一般社団法人日本機械学会の論文

著者

• YAMADA Yutaka

  Nagoya Institute of Technology

• ITO Motoyuki

  Nagoya Institute of Technology

関連論文

• The Flow around a Rotating Cone in a Casing : For the Case When the Cone Vertex Angle is 60° : Series B : Fluid Engineering Heat Transfer Combustion, Power Thermophysical Properties
• Flow Between Eccentric Rotating Cylinders, Where the Clearance is Relatively Large
• On the Frictional Resistance of Enclosed Rotating Cones : 1st Report, Frictional Moment and Observation of Flow with a Smooth Surface
• On the Frictional Resistance of Enclosed Rotating Cones : 2nd Report, Effects of Surface Roughness

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