Study on Formation and Stability of Virtual Channel Levitated by Strong Magnetic Field

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In the processing of the highly pure material and chemically active material, the levitation and the positioning of objects without contact to the wall is most desirable. It is known that the diamagnetic material can be levitated by the strong magnetic field.By placing two infinitely long north poles face to face each other, a non-uniform magnetic field, which is the weakest at the center and is gradually stronger in the radial direction, is produced. When the magnetic field is strong enough, the non-magnetic fluid can stay at a place around the center line of the magnetic field stably just as if it is in a virtual pipe, and is levitated as a long liquid column or may even flow inside the pipe.In order to produce the magnetic pipe in the air or in the vacuum, the very strong magnet is needed, which makes the experimental study very expensive and hard. With the help of the magnetic fluid as a surrounding fluid, the gravity of the levitated non-magnetic liquid can be balanced with the buoyancy and the magnetic force. This makes it possible to levitate stably the non-magnetic liquid even in the weak magnetic field, which is much less expensive and easier to be obtained. In the present research this principle was used to produce the liquid column and the virtual channel.As the magnetic pipe is the virtual one, formed not by the solid wall but by the magnetic field, the levitated liquid column can be deformed or displaced from the equilibrium position, and the waves can occur along the liquid column.The stability of the levitated diamagnetic fluid column against the disturbance exited magnetically was investigated.The divergent virtual channel was produced with the inclined magnets, and the curved virtual channel with the curved magnets. The water could be made to flow successfully inside of them.