Theory of Lubrication With Ferrofluids: Application to Short Bearings

Tipei, N.

doi:10.1115/1.3253274

Cited by 56 publications

(36 citation statements)

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“…These have led to important applications of such fluids in the area of lubrication engineering, especially in journal bearing, thrust bearing, short bearings, etc. [7][8][9]. As theoretically calculated by Rajesh Shah [10,11], the parallel plate slider bearing can support a load with FF lubricant, and the use of FF can increase the load capacity in step bearing.…”

Section: Introductionmentioning

confidence: 98%

Study on the Ferrofluid Lubrication with an External Magnetic Field

et al. 2010

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Ferrofluids (FFs) are stable colloidal systems consisting of single-domain magnetic particles with a diameter of approximately 10 nm coated with surfactants and dispersed in a carrier liquid. By applying an external magnetic field, these fluids can be confined, positioned, shaped and, controlled at desired places. The load capacity of a lubricant film of FF can also be increased with an appropriate magnetic field. In this paper, Fe 3 O 4 -based FFs with different saturation magnetizations (M s ) were prepared by the co-precipitation technique. The tribological experiments of FFs under different magnets distributions were conducted on a ring-on-cylinder tribometer. The results show that the magnetic field intensity distributions on the rubbing surface have a significant influence on the tribological properties of FFs. The experimental results also indicate that FFs have a good friction-reduction performance in the presence of an external magnetic field compared with the carrier liquid and that its lifetime of friction can be greatly improved.

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Section: Introductionmentioning

confidence: 98%

Study on the Ferrofluid Lubrication with an External Magnetic Field

et al. 2010

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“…The most usual engineering applications are in sealing, lubrication, filtering, separation, ink-jet printing, and heat transfer [5][6][7]. In the field of bearing lubrication, several works have already been executed [8][9][10][11][12][13][14]. All the above studies consider the magnetic fluid still behaves as Newtonian fluid.…”

Section: Introductionmentioning

confidence: 99%

Static Performance of Finite Hydrodynamic Journal Bearings Lubricated by Magnetic Fluids with Couple Stresses

Nada

Osman

2007

Tribol Lett

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Based upon the Stokes micro-continuum theory, the problem of lubrication of finite hydrodynamic journal bearing lubricated by magnetic fluids with couple stresses is investigated. By taking into account the couple stresses due to the microstructure additives and the magnetic effects due to the magnetization of the magnetic fluid, modified Reynolds equation is obtained. The effects of couple stresses are studied by defining the couple stress parameter L that can be considered as a measure of the chain length of the additive molecule. The magnetic effects of the magnetic fluid are investigated by the magnetic coefficient c. Using the finite-difference technique and for different values of couple stress parameter and magnetic coefficient, the Reynolds equation is solved, and pressure distributions are obtained. The bearing static characteristics namely load carrying capacity, attitude angle, friction coefficient, and side leakage flow are determined. The results indicate that the influence of couple stresses and magnetic effects on the bearing characteristics are significantly apparent. It is concluded that fluids with couple stresses are better than Newtonian fluids. The improvement of the bearing characteristics is enhanced if the magnetic effects are present.

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“…A good number of research papers are available in the literature for the study of different types of bearing using Neuringer and Rosensweig flow model. For example, (Tipei 1982) in short bearing, (Agrawal 1986), (Shah and Bhat 2003) and in slider bearing, journal bearing by (Nada and Osman 2007) and (Patel el al. 2012), (Andharia and Deheri 2010) in conical plates and circular plates by (Shah and Bhat 2000) and (Deheri and Abhangi 2011).…”

Section: Introductionmentioning

confidence: 99%

The effect of slip velocity on the ferrofluid based squeeze film in longitudinally rough conical plates

Patel¹,

Deheri²

2016

J Serb Soc Comp Mech

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This article makes an attempt to study and analyze the effect of slip velocity on the performance of a magnetic fluid based squeeze film in conical plates considering the longitudinal roughness pattern. The slip model of Beavers and Joseph has been deployed to calculate the effect of slip velocity. The stochastic averaging model of Christensen and Tonder has been used to evaluate the longitudinal roughness effect. The concerned stochastically averaged Reynolds type equation is solved to get the pressure distribution which results in the calculation of load carrying capacity. The findings indicate that the combined adverse effect of slip velocity and roughness can be overcome to a large extent by the positive effect of magnetization and the standard deviation in the case of negatively skewed roughness. This effect further enhances when variance(-ve) is in place. A significant aspect of our study is that in spite of the adverse effect of slip velocity the rough bearing system sustains certain amount of load, even in the absence of the flow which is rarely seen in the case of traditional lubricant based conical bearing system.

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Theory of Lubrication With Ferrofluids: Application to Short Bearings

Cited by 56 publications

References 0 publications

Study on the Ferrofluid Lubrication with an External Magnetic Field

Study on the Ferrofluid Lubrication with an External Magnetic Field

Static Performance of Finite Hydrodynamic Journal Bearings Lubricated by Magnetic Fluids with Couple Stresses

The effect of slip velocity on the ferrofluid based squeeze film in longitudinally rough conical plates

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