Excitation mechanism of thermocapillary oscillatory convection
Abstract
It is suggested that the oscillations of thermocapillary convection may be excited by the buoyancy instability. By means of finiteelement method numerical simulation, the temperature distributions in the liquid bridge are qualitatively analyzed. The temperature gradient in a certain flow region of liquid bridge may turn to be parallel to the direction of gravity when the temperature difference between two boundary rods of liquid bridge is larger than the critical value. The buoyancy instability may be excited, and then the thermocapillary oscillatory convection appears, as the temperature difference increases further. The distribution of the critical Marangoni number in the microgravity environment is derived from the data on the ground experiments. The results show that the onset of thermocapillary oscillatory convection is delayed in the case of smaller typical scale liquid bridge and lower gravity environment.
 Publication:

Science China Series Mathematics Physics Astronomy Technological Sciences
 Pub Date:
 August 1990
 Bibcode:
 1990SCSMP..33..934H
 Keywords:

 Buoyancy;
 Capillary Flow;
 Marangoni Convection;
 Oscillating Flow;
 Reduced Gravity;
 Computational Fluid Dynamics;
 Finite Element Method;
 Temperature Distribution;
 Temperature Gradients;
 Fluid Mechanics and Heat Transfer