Feedback control was carried out on nonlinear thermocapillary convections in a half-zone liquid bridge of a high Prandtl number fluid under normal gravity. In the liquid bridge, the convection changed from a two-dimensional steady flow to a three-dimensional oscillatory flow at a critical temperature difference. Feedback control was realized by locally modifying the free surface temperature using local temperature measured at different positions. The present study aims to confirm whether the control method can effectively suppress oscillatory flows with every modal structure. Consequently, the control was theoretically verified to be effective for oscillatory flows with every modal structure in a high Marangoni number range.
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