0scillatory thermo capillary convection in a spinning cylindrical liquid bridge under micro-gravity condition

摘要

In a viscous liquid column thermocapillary convection arises under the action of an axial temperature gradient. lf this temperature gradient is oscillatory it in- duces surface oscillations and may lead to large ampli- tudes, if the frequency of the temperature fluctuation is in resonance with that of the liquid column. The response of the liquid column (non-rotating and rotating) has been determined and the effect of changing aspect ratio, Prandtl number, thermal expansion coeffi- cient and rotational speed of the column in the case of steady temperature gradient may deteriorate for fluctuat- ing temperatures, especially, if the fluctuating frequency is in reasonance with one of the lower natural frequencies of the liquid. The streamlines for the rotating and non-ro- tating liquid bridge are also presented and show the complex morphology of the convectional flow field, which is due to rotation and temperature oscillations of the liq- uid system.