抄録
The magnetizing force is a body force. This force is produced under an inhomogeneous magnetic field. Therefore, we numerically simulated how magnetizing force affects the natural convection of water with the diamagnetic property in a vertical cylindrical container heated from below and cooled from above. In the present numerical computations, the vertical magnetic field gradient that was produced by the electric current circulating within the circular electric coil was applied to water in a vertical cylindrical container. Moreover, the circular electric coil was placed either at hot or cold plates to change the gradient of magnetic induction. Transient computation converged under all numerical conditions. When the circular electric coil was placed at the lower end plate heated isothermally, the average Nusselt number decreased with the increases of the magnetic strength so that natural convection was suppressed by the magnetizing force. On the other hand, when the circular electric coil was placed at the upper end plate cooled isothermally, the reverse tendency was computed. Furthermore, to understand the mechanism of the generation of the convection induced by the magnetizing force, the fields of temperature and velocity in the transition to the steady state were visualized under two different initial conditions.
