Abstract: This study describes the numerical evaluation of the transient and
steady state characteristics of a magnetothermal wind created by the Kelvin
force inside the bore space of a super-conducting magnet. The model system
designed to evaluate the present numerical computations is composed of two
coaxial circular pipes with open ends. The outer pipe, acting as the cooling
pipe, corresponds to the bore space of the super-conducting magnet, while the
inner pipe, acting as the heating pipe, is installed inside this bore space.
The vertical magnetic gradient generated in the bore space as a source of the
Kelvin force was replaced by that generated by the electric current circulating
within the circular electric coil. The computed results indicated that the
generation direction, the flow rate, and the flow pattern of the magnetothermal
wind strongly depended on the position of the circular electric coil. For
instance, when the circular electric coil was placed at the lower end of the
heating region, the free convection was accelerated by the Kelvin force and an
upward magnetothermal wind with a maximum flow rate was created. On the other
hand, when the circular electric coil was placed at the upper end of the
heating region, the free convection was suppressed by the Kelvin force and a
downward magnetothermal wind was created.
