MAGNETICALLY DAMPED CONVECTION DURING SOLIDIFICATION OF A BINARY METAL ALLOY

The transient transport of momentum, energy, and species during solidi fication of a Pb-19 percent Sn alloy is numerically simulated with and without magnetic damping. The system is contained in an axisymmetric, annular mold, which is cooled along its outer vertical wall. Since th ermosolutal convection accompanies solidification and is responsible f or final macrosegregation patterns, application of a steady magnetic f ield, which is parallel to the axis of the mold, has the potential to reduce macrosegregation by damping buoyancy-driven flow during solidif ication. Results show that, during early stages of solidification, the magnetic field significantly affects thermally driven flow in the mel t, as well as interactions between thermally and solutally driven flow s. However, interdendritic flows and macrosegregation patterns are not significantly altered by moderate magnetic fields. Scaling analysis r eveals that extremely strong fields would be required to effectively d ampen convection patterns that contribute to macrosegregation.