MHD control of convection applied to chemical diffusivities measurements

Chemical diffusivities measurements in liquids on the ground may be deeply influenced by buoyant convection. We have studied the influence of the brak ing effect of an uniform magnetic field on liquid metals. We have shown on the Sn-SnIn1at% couple that it was thus possible to measure a diffusion coe fficient equal to that obtained in microgravity. Moreover, the braking effe ct of the magnetic field is found in agreement with theoretical predictions .