An experimental study is performed to investigate the unstable oscillatory thermocapillary flow and its associate temperature characteristics in a simulated floating zone. Oscillatory flow, which is three dimensional and has an azimuthal directional velocity, appears when the Marangoni number is greater than a certain critical value. The flow patterns in the liquid zone are classified with mode numbers according to the oscillatory flow characteristics. It is determined that the mode depends on the aspect ratio but not on Marangoni number. Also, the thermal oscillation frequency is observed to be equal to the rotation frequency of the flow. Flow oscillation, temperature oscillation and the free surface deformation are found to be closely coupled and these frequencies are equal.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry