Institut für Metallische Werkstoffe – Metallphysik, Sek. PN2-3, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
and
Hochmagnetfeldanlage der Technischen Universität Braunschweig, Mendelssohnstr. 2, 38106 Braunschweig, Germany

Interdiffusion and Convection in High Magnetic Fields   

In liquid diffusion measurements, the main problem is the additional mass transport by convection. In the system Indium-Tin, convection caused by density gradients in horizontal and vertical capillaries was characterised, and the magnetohydrodynamic damping was investigated experimentally. While the magnetic field effect on diffusion experiments in vertical capillaries was relatively minor, the damping effect of the magnetic field could be clearly demonstrated in horizontal capillaries. Comparing these experiments with experiments in microgravity it can be seen that in the investigated system convection was practically completely suppressed by transversal magnetic fields higher than 3T. In electrically conducting crucibles, the sample was mixed by Lorentz forces on account of thermoelectric currents.

keywords: convection, diffusion, indium-tin, liquid metal, magnetohydrodynamic damping, magnetohydrodynamic mixing
 

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