Combined Effect of the Magnetic Strengths and Electro-Conductivity of the Enclosure Wall on the Natural Convection of Liquid Metal in a Cubical Enclosure

摘要

Influence of strengths of a static magnetic field and electro-conductivity of the enclosure wall was numerically studied for oscillatory natural convection of liquid metal in a cubical enclosure. Direction of the static magnetic field is horizontal and parallel to the vertical heated and opposing cold walls. Computations were carried out for Ra =10~5, Pr =0.025, Ha = 50, 200 and 1000, and for the ratio of electro-conductivity (that of wall versus that of fluid) Cm from zero to infinity. The average Nusselt number slightly increased at Ra =50, and almost the same even with the increase in the Hartmann number for Cm=0 and 10~(-3). On the other hand, the average Nusselt number decreased extensively with the Hartmann number for Cm = 0.1 to infinity.