抄録
Simultaneous observation of flow patterns and surface temperature distributions was conducted in a microgravity experiment in the sounding rocket TR-IA #6 with the aim of understanding characteristics of unsteady Marangoni convection in a liquid bridge simulating a half floating zone model. The liquid bridge was 28 mm in diameter and 20 mm in length, and the temperature difference of 50 K was imposed between the heated and the cooled disks so as to achieve a super critical condition. Flow patterns visualized and measured by three-dimensional trajectories of tracer particles have revealed unsteady and complicated flow patterns exhibiting vortex-like circulation zones in the corner region near the disk edge. Time-resolved surface temperature distributions measured with an infrared camera showed intermittent surface temperature fluctuations, which were revealed to be corresponding to the passage of hot fluid lumps coming down from the heated disk. Unlike expectation, no obvious rotational motions were recognized in the three-dimensional particle trajectories or in the surface temperature distributions.
