Derivation of ferrofluid lubrication equation for slider bearings with variable magnetic field and rotations of the carrier liquid as well as magnetic particles

Shah, Rajesh C.

doi:10.1007/s11012-017-0788-9

Cited by 5 publications

(10 citation statements)

References 15 publications

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“…By changing the shell materials [160] or adding the inner surface textures [161], the damper can be miniaturized, lighter, and more flexible, which makes it more suitable for cutting-edge fields such as space and biology. Moreover, improving the methods for controlling the damper, such as passive control, semi-active control, and active control, as well as combining damping technology with other technologies such as lubrication [137,142,162,163], could also significantly expand the range of damping applications of MFs.…”

Section: Conclusion and Perspectivementioning

confidence: 99%

Typical dampers and energy harvesters based on characteristics of ferrofluids

Han

et al. 2022

Friction

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Ferrofluids are a type of nanometer-scale functional material with fluidity and superparamagnetism. They are composed of ferromagnetic particles, surfactants, and base liquids. The main characteristics of ferrofluids include magnetization, the magnetoviscous effect, and levitation characteristics. There are many mature commercial ferrofluid damping applications based on these characteristics that are widely used in numerous fields. Furthermore, some ferrofluid damping studies such as those related to vibration energy harvesters and biomedical devices are still in the laboratory stage. This review paper summarizes typical ferrofluid dampers and energy harvesting systems from the 1960s to the present, including ferrofluid viscous dampers, ferrofluid inertia dampers, tuned magnetic fluid dampers (TMFDs), and vibration energy harvesters. In particular, it focuses on TMFDs and vibration energy harvesters because they have been the hottest research topics in the ferrofluid damping field in recent years. This review also proposes a novel magnetic fluid damper that achieves energy conversion and improves the efficiency of vibration attenuation. Finally, we discuss the potential challenges and development of ferrofluid damping in future research.

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Section: Conclusion and Perspectivementioning

confidence: 99%

Typical dampers and energy harvesters based on characteristics of ferrofluids

Han

et al. 2022

Friction

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“…Besides being used in elastic dampers to reduce noise, FFs are used in cooling and heating cycles, long-term sealing of rotating shafts, and reducing unwanted resonances in loudspeakers. In the last four decades, several investigators (Kumar et al [16], Sinha et al [17], Shah and Bhat [18], Patel and Deheri [19], Shah and Shah [20] and Munshi et al [21]) have worked on a FF lubrication theory to examine the behaviour of various bearing systems.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of ferrofluid lubrication on double-layer porous squeeze curved annular plates with slip velocity

Patel

Deheri

2022

Acta Polytech

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This article makes an effort to present a comparative study on the performance of a Shliomis model-based ferrofluid (FF) lubrication of a porous squeeze film in curved annular plates taking slip velocity into account. The modified Darcy’s law has been adopted to find the impact of the doublelayered porosity, while the slip velocity effect has been calculated according to Beavers and Joseph’s slip conditions. The modified Reynolds equation for the double-layered bearing system is solved to compute a dimensionless pressure profile and load-bearing capacity (LBC). The graphical results of the study reveal that the LBC increases in the case of magnetization, volume concentration and upper plate’s curvature parameter while it decreases with other parameters for both the film thickness profile. A comparative study suggests that the exponential film thickness profile is more suitable to enhance LBC for the annular plates lubricated by ferrofluid, including the presence of a slip. The study shows that the slip model performed quite well and there is a potential for improving the performance efficiency. Besides, multiple methods have been presented to enhance the performance of the above mentioned bearing system by selecting various combinations of parameters governing the system.

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“…Because of having this "adhere property," FFs are used in many applications and also as lubricant (refer [4]). Recently, many investigations (referring [5][6][7][8][9]) are made on slider-bearing designs (which consist of a slider and a bearing surface with a layer of lubricant separating these two parts) from different viewpoints using FFs lubricant owing to its various advantages such as long life, silent operation, reduction of wear and self-sealing ability.…”

Section: Introductionmentioning

confidence: 99%

“…While refs. [6,7,9] used Shliomis model [2], which considers rotation of the magnetic particles and their magnetic moments together, and has significant effect on the increase of viscosity.…”

Section: Introductionmentioning

confidence: 99%

Ferro‐elastohydrodynamic lubrication of inclined slider‐bearing

Shah

2022

Z Angew Math Mech

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In practice, due to bearing load there is a generation of pressure in the lubricant film, which leads elastic deformation on the bounding surfaces and causes variation in the film thickness. As film thickness plays an important role in performance of the slider-bearing designs; an attempt has been made to study numerical simulation of elastic deformation effect in one-dimensional inclined slider-bearing with ferrofluid (FF) lubricant. The modified Reynolds equation is derived using ferrohydrodynamic theory by Shliomis with transverse uniformly strong magnetic field, and continuity equation. Using this equation dimensionless load-carrying capacity ( W) is studied for different parameters. The results show the better performance of W for lower convergence ratio and higher effective viscosity. However, elastic deformation has no effect on W. Some comparisons are also made with the previous literature.

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Derivation of ferrofluid lubrication equation for slider bearings with variable magnetic field and rotations of the carrier liquid as well as magnetic particles

Cited by 5 publications

References 15 publications

Typical dampers and energy harvesters based on characteristics of ferrofluids

Typical dampers and energy harvesters based on characteristics of ferrofluids

A comparative study of ferrofluid lubrication on double-layer porous squeeze curved annular plates with slip velocity

Ferro‐elastohydrodynamic lubrication of inclined slider‐bearing

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