A ferofluidic magnetic seal is a sealing mechanism used in rotating equipment to contain a fluid by means of a physical barrier in the form of a ferrofluid. The ferrofluid is suspended in place by use of a permanent magnet. A fluid is defined as a substance that continually deforms (flows) under an applied shear stress regardless of the magnitude of the applied stress. ... Ferrofluid on glass, with a magnet underneath. ... Ferrofluid on glass, with a magnet underneath. ...
Benefits and limitations
Ferrofluidic seals theoretically are low to no maintenance seal, with no wear parts, and little leakage across the seal, they provide little friction or drag to the shafts they seal and can be configured to operate within fluid property, temperature and pressure ranges other seals fail to meet. // Look up seal in Wiktionary, the free dictionary. ... Friction is the force that opposes the relative motion or tendency toward such motion of two surfaces in contact. ... Look up Drag in Wiktionary, the free dictionary. ... Fig. ... The use of water pressure - the Captain Cook Memorial Jet in Lake Burley Griffin, Canberra. ...
The limitations of ferrofluidic seals are similar to many other seals, they can not withstand extreme pressure differentials, and must be stacked in order to withstand large pressure drops. The ferrofluid under certain conditions can break down, and must be maintained over time. Although leakage rates are extremely low, the seals are still susceptible to leakage. Ferrofluidic seal example The seals are also limited in temperature range to the curie temperature of the magnet keeping them in suspension. In physics, the Curie point, or Curie temperature, is the temperature above which a ferromagnet loses its ferromagnetic ability to possess a net (spontaneous) magnetization in the absence of an external magnetic field. ...
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