回転二重円筒管内に生じる熱対流の室内実験(対流・拡散・渦・波動対流(2),一般講演)

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We investigate the stability of natural convection produced by imposing radial temperature gradient in the gap of two rotating coaxial cylinders by means of laboratory experiments. When rotation rate exceeds some critical value, natural convection is destabilized and helical rolls appear. We observed critical rotation rate and Grashof number (temperature difference across the gap) when the helical rolls emerge with various aspect ratio, and compared with linear stability analysis. As aspect ratio becomes larger, critical rotation rate comes close to that of linear stability analysis. The small Grashof number agree with the prediction of nonlinear analysis that subcritical bifurcation of nonlinear solution leads natural convection to be destabilized with smaller rotation rate. In the absence of rotation, we observed traveling waves at both ends of the gap at high Grashof number.
2009-09-02