A micro-gravity simulation of the Marangoni convection
- Paper ID
1977-IAF-203
- author
- company
DFVLR
- country
Federal Republic of Germany
- year
1977
- abstract
An experimental verification of M ar angon i - c onve dion in the liquid interspace between two-coaxial discs is carried out at reduced gravity effect using small Bond's number obtained by choice of small characteristicat diameter. Silicon oil is used as working fluid. The upper or lower disc can be heated electrically. The flow is visualized by illuminating fine powder of Titandioxide in the fluid with a vertical "light cut" of about 0. 1 mm thickness, which is produced by a laser1 2w 3i t4h 5 a cy lindrical glass rod and a microscope objective. Photographs and moving pictures are taken from a TV monitor. It is shown that the flow on the free surface is always directed from the region of higher temperature to the one of lower temperature and that the vortex center is located near the free surface.