一様磁場下における液体ガリウム層の熱対流(対流(1),一般講演)

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  • Thermal convection in liquid gallium layer with uniform magnetic field

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This study aims to clarify the mechanism of an oscillating motion of the convection cell appearing in the thermal convection of a liquid gallium layer. Ultrasonic Velocity Profiling (UVP) was employed to visualize and quantitativelly estimate the fluid motion of the convection. Obtained spatio-temporal velcocity distributions well represent the convective motion including the oscillating motion of the cell. A result of a numerical simulation, which was done in the same condition with the experiment, and experimental estimation of the Reynolds number mension that the oscillating motion may be induced by instability of separated thermal boundary layers. Thermal convection in uniform magnetic field was also investigated by means of UVP. The obtained spatio-temporal velocity distribution showed us a two dimensionalization of the convective motion as influence of the applying magnetic field.

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