Magnetic fluid splashing from a magnetic fluid seal due to high-speed rotation of the seal ring was experimentally investigated in relation to clearance and magnetic field strength around a gap to be sealed. Meniscus deformation, owing to fluid rotation, was accurately observed by a silhouette formed when the meniscus was illuminated with a bold laser beam from behind. Deformation was found to occur in three stages. In the first stage, the meniscus static width shrank while the meniscus rotation height remained essentially unchanged. In the second stage, rotational height increased slightly and then returned to equilibrium. In the third stage, there was an abrupt entire shrinkage accompanied by splashing at the back side of the gap. With a further increase in rotation speed, splashing at the front side of the gap occurred, which resulted in irreversible loss of fluid. Relationships between the splashing initiation speed at the front gap and meniscus size just before the occurrence of splashing were clarified with the clearance and magnetic field strength as parameters. A useful simple indicator of splashing initiation was established based on these results.
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April 1999
Research Papers
Meniscus Shape and Splashing of Magnetic Fluid in a Magnetic Fluid Seal
Yasunaga Mitsuya,
Yasunaga Mitsuya
Department of Electronic-Mechanical Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01, Japan
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Kenji Tomita,
Kenji Tomita
Data Storage and Retrieval Systems Division, Hitachi Ltd., 2880 Kozu, Odawara 256, Japan
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Kaoru Takeuchi,
Kaoru Takeuchi
Ishikawajima-Harima Heavy industries Ltd., 3-1-5 Toyosu, Kotoh-ku, Tokyo 135, Japan
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Shigeki Matsunaga
Shigeki Matsunaga
Research & Development Center, NSK Ltd., 1-5-50 Kugenuma-shinmei, Fujisawa 251, Japan
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Yasunaga Mitsuya
Department of Electronic-Mechanical Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01, Japan
Kenji Tomita
Data Storage and Retrieval Systems Division, Hitachi Ltd., 2880 Kozu, Odawara 256, Japan
Kaoru Takeuchi
Ishikawajima-Harima Heavy industries Ltd., 3-1-5 Toyosu, Kotoh-ku, Tokyo 135, Japan
Shigeki Matsunaga
Research & Development Center, NSK Ltd., 1-5-50 Kugenuma-shinmei, Fujisawa 251, Japan
J. Tribol. Apr 1999, 121(2): 377-383 (7 pages)
Published Online: April 1, 1999
Article history
Received:
September 20, 1997
Revised:
May 30, 1998
Online:
January 24, 2008
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Citation
Mitsuya, Y., Tomita, K., Takeuchi, K., and Matsunaga, S. (April 1, 1999). "Meniscus Shape and Splashing of Magnetic Fluid in a Magnetic Fluid Seal." ASME. J. Tribol. April 1999; 121(2): 377–383. https://doi.org/10.1115/1.2833950
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