Marangoni convection, driven by an interfacial instability due to a surface tension gradient, presents a significant
problem in crystal growth. It is important to suppress and control the convection phenomenon for better material processing, especially in crystal growth by the Liquid Encapsulated Czochralski or Liquid Encapsulated Floating Zone techniques, in which the melt is encapsulated in an immiscible medium. Marangoni convection can occur both on the liquid-liquid interface and on the gas-liquid free surface. Buoyancy driven convection can also affect and complicate the ‰ow. In the present study, experiments were carried out with two liquid layers, silicone oil and fluorinert, in open and enclosed rectangular cavities. The flow in the cavity was subjected to a horizontal temperature gradient. The interactive flow near the liquid-liquid interface was measured by the Particle Image Velocimetry (PIV) technique. The measured flow field is in agreement with numerical predictions.
View full abstract