Abstract
The present article carries out the study of viscosity variation of non-Newtonian fluid with the homogeneous porous wall on wide parallel rectangular-plate based on the Rabinowitsch fluid model. The non-linear modified Reynolds equation is derived for the lubrication of rectangular squeeze film bearing with viscosity variation and porous parameter. Using the Morgan–Cameron approximation, the nonlinear Reynolds-type equation for squeeze-film which governs the film pressure is solved within the fundamentals of small perturbation technique. The characteristic of the wide parallel rectangular-porous plate is numerically computed for different physical quantities such as film pressure, load carrying capacity and response time. Moreover, as limiting cases some of the results from the available literature are recovered also. Further, the findings reveal that the viscosity variation of non-Newtonian fluid and the presence of porous wall lead to reduction in the load capacity and the response time respectively. Here, the porous matrix consists of a system of capillaries of very small radii with the homogeneous porous wall. The impact of porosity is incorporated as a result it acts as self-lubrication on bearing surface. Also, the effect of viscosity variation is one of the most important characteristics of fluid which helps in the design of bearings for lubrication in engineering and industrial applications.
Similar content being viewed by others
Abbreviations
- \(D,\,a\) :
-
Width and length of the plate
- \(h_{0} ,\,h_{1}\) :
-
Inlet and outlet film thickness
- \(h\) :
-
Film thickness
- \(h^{ * }\) :
-
Dimensionless film thickness defined in Eq. (23)
- \({{dh} \mathord{\left/ {\vphantom {{dh} {dt}}} \right. \kern-0pt} {dt}}\) :
-
Squeeze velocity
- \(x,\,z\) :
-
Horizontal and vertical rectangular coordinates
- \(x^{ * }\) :
-
Non-dimensional coordinate defined in Eq. (23)
- \(w_{H}\) :
-
Velocity of a through-flow on the upper bound of the porous layer
- \(u,\,w\) :
-
Velocity components in \(x\) and \(z\) directions
- \(u_{p} ,\,w_{p}\) :
-
Axial and radial velocity component the porous region
- \(H_{0}\) :
-
Porous pad thickness
- \(H_{0}^{ * }\) :
-
Dimensionless porous pad thickness defined in Eq. (23)
- \(R\) :
-
The radius of the capillary tube
- \(R^{ * }\) :
-
Dimensionless radius of the capillary tube defined in Eq. (23)
- \(k\) :
-
Nonlinear factor accounting for non-Newtonian effects
- \(Q\) :
-
Viscosity variation factor
- \(\bar{p}\) :
-
Pressure in the porous region
- \(p\) :
-
Film pressure
- \(P^{ * }\) :
-
Dimensionless film pressure defined in Eq. (23)
- \(W\) :
-
Load carrying capacity
- \(W^{ * }\) :
-
Dimensionless load-carrying capacity defined in Eq. (33)
- \(t\) :
-
Squeeze response time
- \(t^{ * }\) :
-
Dimensionless squeeze response time defined in Eq. (34)
- \(\mu_{0} ,\,\mu_{1}\) :
-
Inlet and outlet viscosity coefficient
- \(\mu\) :
-
Viscosity of the Newtonian fluid
- \(\tau_{xz}\) :
-
Shear stress
- \(\psi\) :
-
Permeability of the fluid the porous region
- \(\phi\) :
-
Coefficient of porosity
- \(\beta\) :
-
Dimensionless non-linear factor defined in Eq. (23)
References
Pinkus O, Sternlicht B (1961) Theory of hydrodynamic lubrication. McGraw-Hill, New York
Cameron A (1981) Basic lubrication theory. Wiley, New York
Hsu CH, Lin JR, Mou LJ, Kuo CC (2014) Squeeze film characteristics of conical bearings operating with non-Newtonian lubricants–Rabinowitsch fluid model. Ind Lubr Tribol 66(3):373–378
Naduvinamani NB, Rajashekar M, Kadadi AK (2014) Squeeze film lubrication between circular stepped plates: Rabinowitsch fluid model. Tribol Int 73:78–82
Spike HA (1994) The behavior of lubricants in contacts: current understanding and future possibilities. Inst Mech Eng Part J J Eng Tribol 208(1):3–15
Lin JR, Chu LM, Hung CR, Wang PY (2013) Derivation of two-dimensional couple-stress hydromagnetic squeeze film Reynolds equation and application to wide parallel rectangular plates. Meccanica 48(1):253–258
Shah RC, Patel DA (2016) On the ferrofluid lubricated squeeze film characteristics between a rotating sphere and a radially rough plate. Meccanica 51(8):1973–1984
Wada S, Hayashi H (1971) Hydrodynamic lubrication of journal bearings by pseudo-plastic lubricants: part 1, theoretical studies. Bull JSME 14(69):268–278
Wada S, Hayashi H (1971) Hydrodynamic lubrication of journal bearings by pseudo-plastic lubricants: part 2, experimental studies. Bull JSME 14(69):279–286
Lin JR, Hung CR, Chu LM, Liaw WL, Lee PH (2013) Effects of non-Newtonian Rabinowitsch fluids in wide parallel rectangular squeeze-film plates. Ind Lubr Tribol 65(5):328–332
Huang Y, Tian Z (2017) A new derivation to study the steady performance of hydrostatic thrust bearing: Rabinowitch fluid model. J Non-Newton Fluid Mech 246:31–35
Morgan VT, Cameron A (1957) Mechanism of lubrication in porous metal bearings. In: Proceedings of the conference on lubrication and wear, institution of mechanical engineers, London, pp. 151–157
Wada S, Nishiyama N, Nishida SI (1985) Modified Darcy’s law for non-Newtonian fluids. Bull JSME 28(246):3031–3037
Wu H (1978) A review of porous squeeze films. Wear 47(2):371–385
Walicka A (2013) Pressure distribution in a squeeze film of a Shulman fluid between porous surfaces of revolution. Int J Eng Sci 69:33–48
Walicka A, Walicki E, Jurczak P, Falicki J (2017) Curvilinear squeeze film bearing with porous wall lubricated by a Rabinowitsch fluid. Int J Appl Mech Eng 22(2):427–441
Lin JR, Liang LJ, Lu RF (2004) Effects of viscous shear stresses on the squeeze films of porous parallel rectangular plates. J Mar Sci Technol 12(2):112–118
Walicki E, Walicka A, Makhaniok A (2010) Pressure distribution in a curvilinear thrust bearing with one porous wall lubricated by a Bingham fluid. Meccanica 36(6):709–716
Tipei N (1962) Theory of lubrication. Stanford University Press, Stanford, p 3
Sinha P, Singh C, Prasad KR (1981) Effect of viscosity variation due to lubricant additives in journal bearings. Wear 66(2):175–188
Rao PS, Rahul AK (2018) Effect of viscosity variation on non-Newtonian lubrication of squeeze film conical bearing having porous wall operating with Rabinowitsch fluid model. Proc Inst Mech Eng Part C J Mech Eng Sci. https://doi.org/10.1177/0954406218790285
Acknowledgements
The authors wish to express sincere thanks to the Department of Mathematics & Computing IIT (ISM), Dhanbad-826004 for providing the necessary facilities. A. K. Rahul expresses his gratitude to Nagmani Prasad (IIT Dhn) for his healthy discussion to bring the manuscript in the present form. P. S. Rao acknowledges the financial support of 25 (0252)/16/EMR-II Project financed by CSIR (Council of Scientific & Industrial Research), India.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare that they have no conflict of interest.
Additional information
Publisher's Note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Rao, P.S., Rahul, A.K. Combined effect of viscosity variation and non-Newtonian Rabinowitsch fluid in wide parallel rectangular-porous plate with squeeze-film characteristics. Meccanica 54, 2399–2409 (2019). https://doi.org/10.1007/s11012-019-01092-2
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11012-019-01092-2