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동축 구 사이의 자성 유체의 Couette 유동에 관한 연구
구도연(D.Y.Koo),하옥남(O.N.Ha),전운학(U.H.Chun) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1994 No.11_1
Torque characteristics are investigated experimentally for spherical couette flow. Torque measurement was 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 magnetic which was situated in the inner sphere.<br/> In this study, there are two distinct regions before the onset of the turbulence flow regime.<br/> In the laminar flow regime the torque increases when the magnetic field is applied, indicating an increases of the critical Reynold number. However in the laminar trasition regime, the effect of magnetic field on the torque characteristics decreases as the rotation rate increases. The critical Reynolds number is observed to shift toward higher values.<br/>