Thermal analysis of a miniature magnetic fluid seal installed in an implantable rotary pump

Mitamura, Yoshinori; Nishimura, Ikuya; Yano, Tetsuya

doi:10.1016/j.jmmm.2021.168977

Cited by 9 publications

(2 citation statements)

References 13 publications

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“…Mitamura et al measured the magnetic fluid temperature in a miniature magnetic fluid seal installed in a rotary pump, and they investigated the cooling conditions of magnetic fluid seals that control the magnetic fluid temperature. It was observed that, the capacity of the magnetic fluid seal was not affected by magnetic fluid temperature increases due to viscous friction, when the heat transfer coefficient of the seal’s housing reaches a greater value [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Maximum Temperature of Diester-Based Magnetic Fluid Layers in High-Speed Seals

Zhou

Liu

et al. 2023

Nanomaterials

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Magnetic fluids, as smart nanomaterials, have been successfully used in sealing applications and other fields. However, the temperature of magnetic fluids in the sealing gap is a key factor affecting sealing performances, limiting their application in high-speed sealing fields. Since obtaining a direct measurement of the magnetic fluid’s temperature is difficult, due to the small clearance, accurately calculating the maximum temperature of the magnetic fluid layer in high-speed seals is crucial. Herein, a mathematical model for calculating the maximum temperature of the magnetic fluid layer was established, by using a reasonable simplification of high-speed sealing conditions, and the calculation formula was modified by studying the rheological properties of the diester-based magnetic fluid. The results suggest that the calculation of the maximum temperature is influenced by viscous dissipation, and both are related to the rheological characteristics of magnetic fluids. When the influence of rheological properties is ignored, the calculation results are not accurate for higher-velocity seals, but the calculation model applies to lower-velocity seals. When the influence of rheological properties is considered, the calculation results obtained by the corrected formula are more accurate, and they are applicable to both lower- and higher-velocity seals. This work can help us more accurately and conveniently estimate the maximum temperature of magnetic fluids in high-speed seal applications, which is of theoretical and practical research significance for determining sealing performances and thermal designs.

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Section: Introductionmentioning

confidence: 99%

Calculation of the Maximum Temperature of Diester-Based Magnetic Fluid Layers in High-Speed Seals

Zhou

Liu

et al. 2023

Nanomaterials

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“…Reducing the diameter to 1 mm and seal gap to 50 μm, led temperature to be 27°C with cooling. The corresponding shaft speed was 28,100 rpm, equivalent to the linear speed of 1.46 m/sec (Mitamura et al , 2021).…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of combined standard ferrofluid and centrifugal seals

Szczęch,

Raj

2023

ILT

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Purpose Ferrofluid seals are known for their low friction torque and high tightness. However, they have some limitation due to the allowable rotational speed. The work presented here analyzes the performance of newly designed seals which are a combination of a ferrofluid and a centrifugal seal. The new seals can operate at high speeds. The purpose of this study is to theoretically predict the performance of combined seals. Design/methodology/approach Three seals were designed and selected for analysis. A version of the seals with a nonmagnetic insert is also considered, the purpose of which is to facilitate the installation and return of ferrofluid during low rotational speeds. The analyses were based on combining the results of numerical simulation of magnetic field distribution with mathematical models. Findings A combination of ferrofluid sealing and centrifugal sealing is possible. Analyses showed that the combined seal could hold a minimum pressure of 190 kPa in the velocity range of 0–100 m/s. The problem with this type of seal is the temperature. Originality/value New seal designs are presented. Key parameters that affect the seal operation are discussed. A methodology that can be used in the design of such seals is presented. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-07-2023-0221/.

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Advances in magnetic fluid seal and structures

Zeng,

Deng,

et al. 2024

Journal of Magnetism and Magnetic Materials

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Thermal analysis of a miniature magnetic fluid seal installed in an implantable rotary pump

Cited by 9 publications

References 13 publications

Calculation of the Maximum Temperature of Diester-Based Magnetic Fluid Layers in High-Speed Seals

Calculation of the Maximum Temperature of Diester-Based Magnetic Fluid Layers in High-Speed Seals

Design and analysis of combined standard ferrofluid and centrifugal seals

Advances in magnetic fluid seal and structures

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