The behaviour of magnetic fluids under strong nonuniform magnetic field in rotating seal

doi:10.1016/0304-8853(87)90037-0

Journal of Magnetism and Magnetic Materials

Volume 65, Issues 2–3, 1 March 1987, Pages 223-226

https://doi.org/10.1016/0304-8853(87)90037-0 Get rights and content

Abstract

The time dependent local increase of magnetization and effective viscosity are determined for various magnetic fluids subjected to the action of a strong nonuniform magnetic field. Their rate of increase strongly depends on carrier liquid viscosity, particle concentration and dimensional distribution.

References (3)

S. Taketomi
Japan. J. Appl. Phys.
(1980)

There are more references available in the full text version of this article.

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Citation Excerpt :
A combination of these properties unknown in natural materials has made it possible to design technical devices with a MF as the working medium [2–5]. One of the main application fields of magnetic fluids is their use in magnetic fluid sealers (MFS) belonging to non-contact groove seals where the magnetic fluid is held by magnetic field in the working gaps between the contacting parts [6–11]. MFS are currently used in space and aviation engineering, vacuum, chemical and biochemical equipment, optical instrument engineering [3–5].
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With suitable assumptions a hydrodynamic model for the magnetic fluid motion in an axial variable gap seal was constructed, and the solution to the equations of the model was deduced. The characteristics of a magnetic fluid seal and its motion, including the speed and pressure distribution, and the seal capacity of a magnetic fluid rotating seal were systematically described. The factors affecting seal capacity and ways to improve seal capacity based on the hydrodynamic model are discussed. The basic condition for dynamic seal availability is presented. The rotating speed and radius of the shafts should be decreased. The work can provide proof of a seal design or suggest ways to improve the seal capacity of magnetic fluid seals.
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The behaviour of magnetic fluids under strong nonuniform magnetic field in rotating seal

Abstract

Japan. J. Appl. Phys.