6 July 1999 Minimizing convection during solidification by exploiting variation in magnetic susceptibility
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Abstract
The solidification of liquids to produce materials is almost invariably affected by natural convection occurring in the liquid, due to concentration or temperature gradients. Fundamental studies of solidification studies of solidification are hampered by the existence of this convection and such studies have been facilitated by experiments in the microgravity of an orbiting spacecraft, where convection can be nearly eliminated. The paper describes early results from an alternative approach where buoyancy forces can be countered by a magnetic body force that arises from the temperature dependence of the magnetic susceptibility of the liquid. Velocities in a liquid volume, across which a temperature difference was imposed, have been measured by particle image velocimetry. The velocity were found to be significantly reduced when a magnetic field was imposed on the liquid using a superconducting magnet.
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James William Evans, Christopher David Seybert, William Kinzy Jones, Frank R. Szofran, "Minimizing convection during solidification by exploiting variation in magnetic susceptibility", Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); doi: 10.1117/12.351274; https://doi.org/10.1117/12.351274
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