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자성유체에 잠긴 비자성체 부상현상의 다중물리수치해석 및 실험
최홍순(Hong-Soon Choi) 대한전기학회 2013 전기학회논문지 Vol.62 No.1
In this paper, magnetic buoyancy force on nonmagnetic solid object submerged in magnetic liquid was simulated and measured. For the evaluation of the force, a multi-physics approach of hydrostatic equilibrium considering magnetic body force as well as gravity is presented. The magnetic body force should be regarded as an additional forcing term in the momentum equation of hydrodynamics. It is also shown that the virtual air-gap based Kelvin’s force formula is a useful method for the calculation of force distribution in the magnetic liquid. The experimental result which was performed by a load-cell measurement system agreed quantitatively well with the numerical one.
전류가 관통하는 원통형 자성체에 미치는 전자기력식의 통일성에 대한 고찰
최홍순(Hong Soon Choi) 한국자기학회 2011 韓國磁氣學會誌 Vol.21 No.5
Magnetic force calculation methods such as Maxwell stress, virtual work principle, equivalent magnetic charge, and equivalent magnetizing current are widely used until now. The force density is still controversial issue even though it is common sense that all of these methods have legitimate results. The surface force densities of each method are quite different with each other in the point of numerical result and final expression. In this paper, it is shown that a unified expression of body force density is derived using virtual air-gap scheme for an analytic model in which cylindrical magnetic material with a vertical current runs through its center.