Two-dimensional numerical computations were carried out in order to examine the effect of magnetizing force for the air in a cylindrical container with thermal and magnetic ®eld gradients. In a gravitational ®eld, the air was driven by both gravitational and magnetizing forces, and¯ow pattern and the heat transfer rate greatly depended on the axial position of the coil. Moreover, when the magnetizing and gravitational forces cancel out each other, convection became almost quiescent. On the other hand, the aerial¯ow was induced by the magnetizing force even in a nongravitational ®eld, and the air behaved like an electrically conducting¯uid.

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