Flow Visualization of Magnetic Convection of Paramagnetic Fluid in a Cylinder

抄録

Convection of a paramagnetic fluid inside a vertical cylinder placed in the bore of a superconducting magnet was studied. The bore axis and cylinder axis were placed coaxially. The upper side wall of the cylinder was electrically heated and lower side wall was cooled isothermally. The upside-down case was also studied. The mixture of water and glycerol was used as a working fluid. The magnetic susceptibility of the mixture was increased by adding the particular amount of Gd(NO₃)₃ 6H₂O. A horizontal mid cross section of the cylinder was illuminated to see the isotherms with dispersed liquid crystal slurry. The color image showed that the magnetic field affected the fluid flow structure - it enhanced the convective flow and also induced flow from a quasi conduction state.