Blood sealing properties of magnetic fluid seals

Tomioka, Jun; Miyanaga, Norifumi

doi:10.1016/j.triboint.2016.12.040

Cited by 16 publications

(10 citation statements)

References 19 publications

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“…MFSs have attracted attention as potential candidates for blood pump seals owing to their interesting properties. Tomioka and Miyanaga [129] discussed the seal capacity including the sealing durability and…”

Section: Magnetic Fluid Rotary Sealingmentioning

confidence: 99%

Theory analyses and applications of magnetic fluids in sealing

et al. 2023

Friction

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Magnetic fluids are the suspensions composed of magnetic nanoparticles, surfactants, and non-magnetic carrier liquids. Magnetic fluids are widely used in various fields, especially in sealing, because of their excellent features, including rapid magnetic response, flexible flow ability, tunable magneto-viscous effect, and reliable self-repairing capability. Here, we provide an in-depth, comprehensive insight into the theoretical analyses and diverse applications of magnetic fluids in sealing from three categories: static sealing, rotary sealing, and reciprocating sealing. We summarize the magnetic fluid sealing mechanisms and the development of magnetic fluid seals from 1960s to the present, particularly focusing on the recent progress of magnetic fluid seals. Although magnetic fluid sealing technology has been commercialized and industrialized, many difficulties still exist in its applications. At the end of the review, the present challenges and future prospects in the progress of magnetic fluid seals are also outlined.

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Section: Magnetic Fluid Rotary Sealingmentioning

confidence: 99%

Theory analyses and applications of magnetic fluids in sealing

et al. 2023

Friction

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“…The burst pressure is the maximum difference of pressures between the sealed environments over which the leakage is observed. A typical static burst pressure of FFs is in the tens of kPa; Kordonski [6] published a static burst pressure of 0.5 bar; Sczech [7] was in the range from 0.48 bar to 0.65 bar, dependent on ferrofluid type; while Tomiota [8] registered 0.3 bar. The dynamic burst pressure of FFs is usually slightly dependent on rotation [6,8] and temperature [9].…”

Section: Ferrofluid Seals (Ffs)mentioning

confidence: 99%

A magnetorheological fluid shaft seal with low friction torque

Kubík

Pavlíček

Macháček

et al. 2019

Smart Mater. Struct.

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This paper deals with the design and tests of a magnetorheological fluid seal (MRFs) using the innovative concept of the magnetic circuit, which allows the achievement of a promising trade-off between burst pressure and friction of the seal. Low friction torque and low burst pressure are typical for a ferrofluid seal (FFs). Replacement of the ferrofluid by magnetorheological fluid increases the burst pressure of the seal but the friction torque of the seal increases too. The optimum for sealing application is low friction torque and high burst pressure. The presented design is based on the pinch mode of magnetorheological fluid. The geometry of the seal was determined by a magnetostatic model. Subsequently, the chosen concept of the seal was manufactured and tested. Pinch MRFs achieved lower friction torque than common (standard) MRFs and a higher burst pressure than any FFs.

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“…It was based on the calculation of radial or axial magnetic field components of annular permanent magnets, this model can predict the shape and pressure resistance of magnetic fluid seals better. Tomioka et al [15] applied the ferrofluid rotary seal to the blood pump and studied the maximum pressure resistance and seal durability of the ferrofluid seal. In the experiment, they designed a device for accelerated test.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the critical pressure of converging ferrofluid seal with alternating pole teeth

Yang

Jiang²,

Li³

2023

Phys. Scr.

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For the improvement of pressure capability in ferrofluid seal with a small gap, a structure of converging ferrofluid seal (CFS) with alternating pole teeth is proposed in this study. Distribution of magnetic field in this structure is analyzed by using finite element method, and then theoretical values of withstanding gas pressure are calculated. The influence of ferrofluid volume, sizes of radial sealing gap (RSG) and axial sealing gap (ASG), numbers of radial pole tooth (RPT) and axial pole tooth (APT) on the critical pressure of CFS with alternating pole teeth is studied on the test bench. Then experimental results are compared and analyzed with the experimental pressure resistance of ordinary stepped ferrofluid seal. It is demonstrated that the calculated value of pressure resistance of the CFS with alternating pole teeth fits well with the experimental data. The volume of the injected ferrofluid can reach saturation. The sealing performance of CFS with alternating pole teeth is related not only to the clearance between pole teeth and stepped shaft, but also to the number of RPT and APT. The sealing performance of CFS with alternating pole teeth is better than that of ordinary stepped ferrofluid seal.

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Blood sealing properties of magnetic fluid seals

Cited by 16 publications

References 19 publications

Theory analyses and applications of magnetic fluids in sealing

Theory analyses and applications of magnetic fluids in sealing

A magnetorheological fluid shaft seal with low friction torque

Experimental study on the critical pressure of converging ferrofluid seal with alternating pole teeth

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