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A magnetic fluid seal for rotary blood pumps: Behaviors of magnetic fluids in a magnetic fluid seal
Bio-Medical Materials and Engineering, 2013A magnetic fluid (MF) seal has excellent durability. The performance of an MF seal, however, has been reported to decrease in liquids (several days). We have developed an MF seal that has a shield mechanism. The seal was perfect for 275 days in water.
Yoshinori, Mitamura +3 more
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Analysis of Magnetic-Fluid Seals
A S L E Transactions, 1981The paper offers a basic investigation of magnetic-fluid sealing. The objectives aimed at quantitative relationships between the parameters of the magnetic circuit, the properties of the fluid, and the resulting Δp capacity of a single or multistage seal. The pole pieces were investigated with the aim of arriving at an optimum configuration which would
Jed A. Walowit, Oscar Pinkus
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Blood sealing properties of magnetic fluid seals
Tribology International, 2017Abstract Shaft seals for rotary blood pumps have strong demands for low friction, very little leakage, and long-term use. Magnetic fluid seals have attracted attention as promising candidates for this purpose owing to their properties of having zero leakage, no wear, and relatively small viscous friction at the same time.
Jun Tomioka, Norifumi Miyanaga
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Magnetic fluids in sealing and lubrication – a state of the art review
Journal of Synthetic Lubrication, 1993AbstractThe paper is a review of the properties and functions of magnetic fluids and their potential use in tribological applications, such as seals and bearings. They offer new possibilities for achieving low friction, low wear, and no leak‐ age.Magnetic fluids or ferrofluids consist of magnetic particles suspended in a carrier fluid and a coating on ...
Säynätjoki, Matti, Holmberg, Kenneth
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A Study of Magnetic Fluid Seals for Blood Sealing
The proceedings of the JSME annual meeting, 2002Magnetic fluid seals are used in a wide variety of gas and dust sealing applications. However, it is difficult to seal for liquid because of its characteristic. This study will be a basic guide for a magnetic fluid seal for liquid, especially for blood to be practically used in medical instruments such as rotary blood pumps by clarifying its seal ...
Jun TOMIOKA +2 more
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Sealing mechanism of magnetic fluids
Journal of Shanghai University (English Edition), 2006Sealing is one of the most successful applications of magnetic fluids. However, the sealing pressure difference is not satisfactory. This paper theoretically analyzes the mechanism of magnetic fluids sealing. Main factors that have significant effects on the sealing ability include viscous stress on the interfacial surface, magnetic surface tension ...
Chu-wen Guo, Shi-cai Feng
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Experimental study on splashing characteristics of magnetic fluid in a magnetic fluid seal
Journal of Magnetism and Magnetic Materials, 1993Abstract The splashing characteristics of a magnetic fluid spindle seal designed for magnetic disk storage use were experimentally studied in terms of the meniscus spread and configuration formed around the seal gap. The critical rotational speed at which splashing of the magnetic fluid is initiated is found to be uniquely determined by the spread of
Yasunaga Mitsuya +2 more
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Dynamic Sealing with Magnetic Fluids
A S L E Transactions, 1975If a lip seal could use a liquid lip, the resulting perfect conformity to the rotating and stationary surfaces would negate the effects of surface finish and mechanical run-out. Magnetic fluids, called ferrofluids, make this type of seal possible and practical.
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Dynamic sealing with magnetic fluids
Wear, 1989Abstract Ferrofluidic seals are the most advanced application of ferromagnetic fluids. They are used for sealing gases at pressures up to 3.5 MPa and vacuum sealing (up to 10−8 Torr) at shaft speeds over 30 000 rev min−1. This paper presents the design and operating principles of a ferromagnetic seal.
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Non-uniform Distribution of Magnetic Fluid in Multistage Magnetic Fluid Seals
Journal of Magnetics, 2017Magnetic fluid, a new type of magnetic material, is a colloidal liquid constituted of nano-scale ferromagnetic particles suspended in carrier fluid. Magnetic fluid sealing is one of the most successful applications of magnetic fluid. As a new type of seal offering the advantages of no leakage, long life and high reliability, the magnetic fluid seal has
Wang Zhongzhong, Li Decai, Zhou Jing
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