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Abstract
Transient characteristics of air flow in a vertical pipe under a superconducting magnet were studied numerically with new mathematical modeling equations of magnetizing force. Air is a paramagnetic fluid and has an exceptionally large magnetic susceptibility. The distribution of the magnetic field in the bore of a superconducting magnet was calculated by Biot-Savart's law. When the vertical cylinder was filled initially with hot air, the hot air was repelled from the pipe upward immediately, due to the buoyancy and magnetizing forces. However, when the vertical pipe was filled initially with cold air, the cold air was sustained for a long time due to the magnetizing force overcoming the buoyancy force.