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Performance of magnetic fluid based squeeze film between a curved porous circular plate and a flat circular plate and effect of surface roughness
aBirla Vishvakarma Mahavidyalaya Engineering College, Vallabh Vidyanagar, India
bDepartment of Mathematics, Sardar Patel University, Vallabh Vidyanagar, India

emailgm.deheri@rediffmail.com
Keywords: squeeze film; magnetic fluid; rough surface; Reynolds equation; load carrying capacity; circular plates
Abstract
Efforts have been directed to study and analyze the squeeze film behavior between a curved rough porous circular plate and a flat rough porous circular plate under the presence of a magnetic fluid lubricant. The curved film thickness is described by a secant function. It is taken in to consideration that the external magnetic field is oblique to the lower plate. The bearing surfaces are assumed to be transversely rough. The random roughness of the bearing surfaces is characterized by a stochastic random variable with non-zero mean, variance and skewness. The concerned Reynolds equation governing the film pressure is averaged with respect to the random roughness parameter. The associated non-dimensional partial differential equation is solved with appropriate boundary conditions in dimensionless form to obtain the pressure distribution, in turn, which leads to the calculation of load carrying capacity. The computed results show that the performance of bearing system enhances considerably as compared to that of a bearing system working with a conventional lubricant as the magnetization increases the effective viscosity of the lubricant. The results tend to indicate that the bearing suffers due to transverse surface roughness, in general. Probably this may be due to the fact that the transverse surface roughness offers resistance to the motion of the lubricant. The effect of variance (negative) is considerably positive at least in the case of negatively skewed roughness as the load carrying capacity arises sharply. The combined effect of porosity and standard deviation is relatively adverse, in the sense that the already decreased load carrying capacity due to porosity gets further decreased owing to standard deviation. However, this investigation suggests some ways to mitigate this adverse effect.
References
Ajwaliya, M.B. (1984) On Certain Theoretical Aspects of Lubrication. Vallabh Vidyanagar: Sardar Patel University, Dissertation
Andharia, P.I., Gupta, J.L., Deheri, G.M. (1997) Effect of longitudinal surface on hydrodynamic lubrication of slider bearings. in: International Conference on surface modification technologies (X), Proc, The Institute on Materials, str.p. 872-880
Bhat, M.V., Deheri, G.M. (1991) Squeeze film behavior in porous annular disks lubricated with magnetic fluid. Wear, 151(1): 123
Bhat, M.V., Deheri, G.M. (1993) Magnetic-fluid-based squeeze film in curved porous circular discs. Journal of Magnetism and Magnetic Materials, 127(1-2): 159-162
Bhat, M.V. (2003) Lubrication with a magnetic fluid. India: Team Spirit
Bueckner, H., Horvay, G. (1963) Closure to “Discussions of ‘Heat-Transfer Coefficient of Inviscid Fluid Freezing Onto a Moving Heat Sink’” (1963, ASME J. Heat Transfer, 85, pp. 257-258). Journal of Heat Transfer, 85(3): 258
Christensen, H., Tonder, K.C. (1969) Tribology of rough surfaces: Stochastic models of hydrodynamic lubrication. SINTEF Report, br. 10/69-18
Christensen, H., Tonder, K.C. (1969) Tribology of rough surfaces: Parametric study and comparison of lubrication models. SINTEF Report, br. 22/69-18
Christensen, H., Tonder, K.C. (1970) The hydrodynamic lubrication of rough bearing surfaces of finite width. in: ASME-ASLE lubrication conference, Paper br. 70-lub-7
Davim, P.J. (2011) Tribology for Engineering: A practical guide. Oxford - Cambridge - Philadelphia - New Delhi: WP
Davis, M.G. (1963) The Generation of pressure between rough lubricated, moving deformable surfaces. Lub. Engg, vol. 19, str. 246
Deheri, G.M., Patel, R.M. (2006) Squeeze Film based Magnetic Fluid in between Porous Circular Disk with Sealed Boundary. Int. Journal of Applied Mechanics and Eng, 11(4), 803-812
Deheri, G.M., Andharia, P.I., Patel, R.M. (2005) Transversely Rough Slider Bearings with Squeeze Film formed by a Magnetic Fluid. Int. Journal of Applied Mechanics and Engineering, (10): 53-76
Guha, S.K. (1993) Analysis of dynamic characteristics of hydrodynamic journal bearings with isotropic roughness effects. Wear, 167(2): 173-179
Gupta, J.L., Deheri, G.M. (1996) Effect of Roughness on the Behavior of Squeeze Film in a Spherical Bearing. Tribology Transactions, 39(1): 99-102
Gupta, J.L., Vora, K.H. (1980) Analysis of Squeeze Films Between Curved Annular Plates. Journal of Lubrication Technology, 102(1): 48
Hai, W. (1971) The squeeze film between rotating porous annular disks. Wear, 18(6): 461-470
Hsu, C.H., Lai, C., Hung, C.R., Lin, J.R. (2008) Magneto-hydrodynamic squeeze film characteristics between circular discs including rotational inertial effects. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 222(2): 157-164
Hsu, C.H., Lu, R.F., Lin, J.R. (2009) Combined Effects of Surface Roughness and Rotating Inertia on the Squeeze Film characteristics of Parallel Circular Disks. Journal of Marine Science and Techno, 7 (1): 60-66
Huang, W., Shen, C., Liao, S., Wang, X. (2011) Study on the Ferrofluid Lubrication with an External Magnetic Field. Tribology Letters, 41(1): 145-151
Mohammadein, A.A., Gorla, R.S.R. (1996) Effects of transverse magnetic field on mixed convection in a micropolar fluid on a horizontal plate with vectored mass transfer. Acta Mechanica, 118(1-4): 1-12
Patel, H.C., Deheri, G.M., Patel, R.M. (2008) Behavior of squeeze film between rough porous infinitely long parallel plates with porous matrix of variable. in: Technische Akademie Esslingen, 16th International Colloquium Tribology on Lub. materials and Lub. Engg. C-6, Stuttgart/Ostildern, German
Patel, R.M., Deheri, G.M. (2002) Magnetic Fluid-Based Squeeze Film between two Curved Plates lying along the Surfaces Determined by Secant Functions. Indian Journal of Engineering and Material Sciences, 9, 45-48
Prajapati, B.L. (1991) Behaviour of squeeze film between rotating porous circular plates: Surface roughness and elastic deformation effects. Pure and Appl. Math. Sci, vol. 33(1- 2), str. 27-36
Prajapati, B.L. (1992) Squeeze film behaviour between rotating porous circular plates with a concentric circular pocket: Surface roughness and elastic deformation effects. Wear, 152(2): 301-307
Prakash, J., Vij, S.K. (1973) Load capacity and time-height relations for squeeze films between porous plates. Wear, 24(3): 309-322
Prakash, J., Tiwari, K. (1982) Lubrication of a porous bearing with surface corrugations. J. Lub. Tech. Trans. ASME, vol. 104, str.p. 127-134
Prakash, J., Tiwari, K. (1983) Roughness effects in porous circular squeeze-plates with arbitrary wall thickness. Journal of Lubrication Technology, 105(1): 90
Shimpi, M.E., Deheri, G.M. (2010) Surface roughness and elastic deformation effects on the behaviour of the magnetic fluid based squeeze film between rotating porous circular plates with concentric circular pockets. Tribology in Industry, 32(2): 21-30
Ting, L.L. (1975) Engagement behavior of lubricated porous annular disks. Part I: Squeeze film phase - surface roughness and elastic deformation effects. Wear, 34(2): 159-172
Ting, L.L. (1972) A Mathematical Analog for Determination of Porous Annular Disk Squeeze Film Behavior Including the Fluid Inertia Effect. Journal of Basic Engineering, 94(2): 417
Tonder, K.C. (1972) Surface distributed waviness and roughness. in: World conference in industrial tribology (I), New Delhi, str. 128
Tzeng, S.T., Saibel, E. (1967) Surface Roughness Effect on Slider Bearing Lubrication. A S L E Transactions, 10(3): 334-348
Verma, P.D.S. (1986) Magnetic fluid based squeeze films. International Journal of Engineering Sciences, Vol.24(3), p.p.395-401
Wu, H. (1970) Squeeze film behaviour for porous annular disks. J. Lub. Tech, vol. 92, str. 206- 209