CAJ | 학술논문

利用高温熔体实时观察装置观察和研究了Bi12SiO20熔体中表面张力对流从稳态向振荡态的转变过程;稳态过程中的对流图样变化;可能与对流转变有关的两个对流区域的交叉;振荡态对流的分叉现象.
이용고온용체실시관찰장치관찰화연구료Bi12SiO20용체중표면장력대류종은태향진탕태적전변과정;은태과정중적대류도양변화;가능여대류전변유관적량개대류구역적교차;진탕태대류적분차현상.
Schilren technique coupling differential interferential microscope was employed to in-situ observation high temperature Bi12SiO20 melt Marangoni convection. The bifurcation of oscillatory convection was also observed in this experiment and the oscillatory frequency was obtained as 57Hz. In the steady convection stage, the flow configuration appears as fish-like shape which comprises of a main-trunk and two branches. The width of the main-trunk decreases with temperature rising. Meanwhile, along the main-trunk two darker color regions appear symmetrically. The distance between them becomes, narrower gradually and crossed together at last. This is the critical point for the transition to oscillatory convection. The critical Marangoni number Mac 22433 experimentally obtained for Bi12SiO20 melt, agrees with a theoretical speculation Mac=2884Pr0.638 for high Prandtl number melt.