磁性流体の球クエット流れに関する実験的研究 : 内球回転時におけるトルク特性 (小特集電磁力関連流体工学)

概要

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Torque characteristics are investigated experimentally for spherical Couette flow, using manetic fluids. Torque measurements were obtained for the situation where the inner sphere was rotating while the outer sphere was kept stationary. The magnetic field was imposed on the fluid, using a bar magnet which was situated in the inner sphere. There are two distinct regions before the onset of the turbulence flow regime. In the laminar flow regime the torque increases when the magnetic field is applied, indicating an increase in the effective viscosity. However, in the laminar transition regime, the effect of the magnetic field on the torque characteristics decreases as the rotation rate increases. The critical Reynolds number is observed to shift toward higher values.
1993-06-25