Preliminary results of Texus 8 experiments on effects of surface tension minimum

In an experience cell 3 x 2 x 1 cm a stable observable liquid-gas interface was realized under microgravity conditions. A temperature gradient was established in the interface. With the aqueous n-heptanol 0.00624 molal solution, the consequence is the build-up of a Marangoni convection cell turning in the unusual direction: in the surface the liquid flows from cold to hot side. The same experience on earth gives rise to a Marangoni cell superposed on buoyancy cells, Marangoni and buoyancy cells turning in opposite direction.