Experimental Study for Spherical Couette Flow in Magnetic Fluid. Torque Characteristics for Outer Sphere Rotation.

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  • 磁性流体の球クエット流れに関する実験的研究　外球回転時におけるトルク特性
  • ジセイ リュウタイ ノ キュウ クエット ナガレ ニ カンスル ジッケンテキ

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Abstract

Experimental investigation was carried out in an attempt to provide data and phenomenological explanation of spherical couette flow in magnetic fluid for the situation where the outer sphere rotates while the inner sphere is stationary. Data for torque characteristics were obtained when a magnetic field was imposed on the fluid, using a bar magnet which was situated in a stationary inner sphere. The torque (torque coefficient) increases, when the density of the magnetic field is increased and when the spherical gap width is increased, resulting in an increase of the effective viscosity. The main flow dominant regime (spherical couette flow with weak secondary flow) appeared to be extended toward higher Reynolds number, suppressing the strong secondary flow, while with further increase of Reynolds number, the torque characteristics approach the non magnetic field case, showing no effect of magnetic field.

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