Magnetohydrodynamic Squeeze Films

Kuzma, Dennis C.

doi:10.1115/1.3653131

Cited by 38 publications

(23 citation statements)

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“…Assumption of Newtonian lubricant behaviour is, in general, idealised. [28] and Shukla [29]. This case represents active suspension elements for vehicles under relatively larger displacement.…”

Section: -Results and Discussionmentioning

confidence: 99%

Magneto-hydrodynamics of couple stress lubricants in combined squeeze and shear in parallel annular disc viscous coupling systems

Daliri

Jalali-Vahid

Rahnejat

2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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This paper presents predictive analysis of load carrying capacity, tractive efficiency and response time of parallel annular discs intervened with a film of lubricant under combined shear and squeeze film motions. This configuration represents operational characteristics of viscous coupling systems. In particular, the case of viscous dampers for tractive torque generation and distribution in all-wheel-drive off-road vehicles is studied. Various forms of lubricant behaviour, from idealised Newtonian to that of non-Newtonian silicone-based fluids and incompressible isothermal electrically conducting couple stress fluids, subjected to a magnetic field are studied (MHD). The solution for the MHD includes combined solution of modified Reynolds equation and Stoke's micro-continuum for couple stress fluids in squeeze and shear with rotational fluid inertia, an approach not hitherto reported in literature.It is shown that in general MHD couple stress fluids enhance the load carrying capacity of the contact and inhibit the incidence of thin films which can result in direct contact of surfaces. Rotational inertia decreases the load carrying capacity, although in general the MHD fluids show better load carrying capacity and tractive efficiency than the other alternatives. However, they exhibit a lower response time under the assumed isothermal condition. Nevertheless, the MHD fluids are best suited to applications in viscous coupling systems because of their controllability.

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Section: -Results and Discussionmentioning

confidence: 99%

Magneto-hydrodynamics of couple stress lubricants in combined squeeze and shear in parallel annular disc viscous coupling systems

Daliri

Jalali-Vahid

Rahnejat

2014

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Notation a radius of the plates (m) B 0 uniform transverse magnetic field applied between the plates c 2 1 + KM 2 The equations of motion along x and z directions obtained from the equations (6) and (8) to (11) take the form…”

Section: Appendixmentioning

confidence: 99%

Behaviour of hydromagnetic squeeze films between two conducting rough porous circular plates

Vadher¹,

Vinodkumar

Deheri

et al. 2008

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, the problem of squeeze films between electrically conducting rough porous surfaces and electrically conducting lubricant in the presence of transverse magnetic field is investigated for circular shape of the bearing surfaces. The bearing surfaces are assumed to be transversely rough. The roughness of the bearing surface is modelled by a stochastic random variable with non-zero mean, variance, and skewness. The associated Reynolds equation is stochastically averaged with respect to the random roughness parameter. Then, it is solved with appropriate boundary conditions to get the pressure distribution, which is further used to obtain the load carrying capacity leading to the calculation of response time. The results are presented graphically. It is noticed that the bearing suffers on account of transverse surface roughness in general. However, the situation can be retrieved up to a certain extent in the case of negatively skewed roughness especially, when negative variance occurs by suitable choice of plate conductivities. In addition, it is observed that the bearing with magnetic field can support a load even when there is no flow. field to create a body force which pumps the fluid between the bearing surfaces. Since the liquid metals are good electrical conductors, it is possible to increase the load carrying capacity by utilizing the electromagnetic force thereby, overcoming the defect associated with lubricants at high temperature and hence alleviating the drawback of low viscosity. Considerably high increase in load carrying capacity is possible with the use of super conducting magnets while very little power is required to provide the magnetic field.A number of theoretical and experimental studies on the hydromagnetic lubrications for porous as well as plane metal bearings have appeared. Elco and Huges [1] studied magnetohydrodynamic pressurization in liquid metal lubrication. Kuzma [2] and Kuzma et al. [3] analysed the behaviour of magnetohydrodynamic squeeze films. Shukla [4] investigated the hydromagnetic theory of squeeze films for conducting lubricants between two non-conducting JET390

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“…at high speed and external load. During the last few decades, the application of electrically conducting lubricant has received considerable attention in different classes of fluid bearings such as hydrostatic/hybrid thrust pad bearings [2,[26][27][28], slider bearings [29][30][31] and squeeze film bearings [32,33]. In the beginning, theoretical studies were carried out by Elco and Hughes [26], examining the use of liquid metals as electrically conducting lubricant in circular step and one-dimensional inclined slider bearings.…”

Section: Introductionmentioning

confidence: 99%

Effect of geometric shape of micro-grooves on the performance of textured hybrid thrust pad bearing

Kumar

Sharma

2019

J Braz. Soc. Mech. Sci. Eng.

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A numerical simulation is performed to investigate the synergizing influence of surface texture (micro-grooves) and electrically conducting lubricant on static and dynamic performance of hybrid thrust pad bearings operating under transverse magnetic field. Linear momentum and mass conservation equation are solved simultaneously to derive modified Reynolds equation for magnetohydrodynamic lubrication. Finite element approach has been used to obtain couple solution of modified Reynolds equation and restrictor (orifice) flow equation. A mass conserving algorithm (Jakobsson-Floberg-Olsson boundary condition) has been implemented to simulate cavitation phenomenon within micro-grooves. A parametric investigation (based on load-carrying capacity/fluid film pressure) is carried out to obtain optimum attributes for various micro-grooves shapes. Providing micro-groove on bearings surfaces results in a significant increase in load-carrying capacity, stiffness coefficient and reduction in frictional power loss of the bearing. Employing of electrically conducting lubricant is seen to be enhancing the load-carrying capacity and damping characteristics of the bearing.

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Magnetohydrodynamic Squeeze Films

Cited by 38 publications

References 0 publications

Magneto-hydrodynamics of couple stress lubricants in combined squeeze and shear in parallel annular disc viscous coupling systems

Magneto-hydrodynamics of couple stress lubricants in combined squeeze and shear in parallel annular disc viscous coupling systems

Behaviour of hydromagnetic squeeze films between two conducting rough porous circular plates

Effect of geometric shape of micro-grooves on the performance of textured hybrid thrust pad bearing

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