Suppression of temperature oscillations of thermal Marangoni convection in a floating zone by superimposing of rotating flows

Temperature oscillations in a floating zone causally connected with the oscillatory thermal Marangoni convection, are suppressed by superimposing suitable rotating flows. Flows are induced by single rotations or isorotations of the coaxial disks, yielding the upper and lower solid boundaries of the floating zone. Effects are studied to determine in which range of interaction a coupled flow becomes a steady one and temperature oscillations disappear. The frequency of the Marangoni convection is found to change due to the rotation regardless of single rotation or isorotation, and a successful suppression of the oscillation occurs when the axisymmetric pressure field constrains the coupled flow. In addition, the absolute value of frequency shift due to the single rotation of the warm disk increases linearly with the interaction parameter, while single rotation of the cold disk and isorotation of both disks produce a positive frequency shift.