The Effect of the Fluid Film Variable Viscosity on the Hydrostatic Thrust Spherical Bearing Performance in the Presence of Centripetal Inertia and Surface Roughness Part 2, Recessed Fitted Bearing
International Journal of Mechanical Engineering and Applications
Volume 6, Issue 3, June 2018, Pages: 73-90
Received: Jul. 12, 2018;
Accepted: Aug. 14, 2018;
Published: Sep. 11, 2018
Views 409 Downloads 38
Ahmad Waguih Yacout Elescandarany, Mechanical Department, Faculty of Engineering, Alexandria University, Alex, Egypt
The study deals with the fluid viscosity variation, the centripetal inertia and the bearing surface roughness affecting the externally pressurized thrust spherical bearing performance where the partial differential equation of the temperature gradient previously derived from the fluid governing equations, is integrated and applied to this type of bearings to calculate and predict temperature distribution along the fluid film. In this part of the research, the recessed fitted type of bearings has been studied deriving mathematical expressions that not only cover this configuration but also cover the fitted type of this bearing with its different configurations and showing also the recess effect on the bearing performance. The results showed the effect of the viscosity variation on the pressure, the load caring capacity, the fluid flow rate, the frictional torque, the friction factor, the power factor, the stiffness factor and the central pressure ratio as well as the effect of the speed parameter and the eccentricity on the temperature rise. Applying these derived mathematical expressions, which could be considered as a general solution for the fitted type, an optimum design for the fitted type with its different configurations (with and without recess; hemispherical and partial hemispherical seats) has been performed. Using the same bearing dimensions, the application of these equations proved the excellence of the aforementioned optimum design of this bearing in our previous papers where the temperature of the outlet flow was less than 14 degrees centigrade over its inlet temperature.
Ahmad Waguih Yacout Elescandarany,
The Effect of the Fluid Film Variable Viscosity on the Hydrostatic Thrust Spherical Bearing Performance in the Presence of Centripetal Inertia and Surface Roughness Part 2, Recessed Fitted Bearing, International Journal of Mechanical Engineering and Applications.
Vol. 6, No. 3,
2018, pp. 73-90.
Copyright © 2018 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/
) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Dowson D. and Taylor M. 1967, “Fluid inertia effect in spherical hydrostatic thrust bearings”, ASLE Trans. 10, 316- 324.
Dowson D. and Taylor M. 1967, “A Re- Examination of hydrosphere performance”, ASLE Trans. 10, 325- 333.
Ahmad W. Yacout, Ashraf S. Ismaeel, Sadek Z. Kassab, 2007, “The combined effects of the centripetal inertia and the surface roughness on the hydrostatic thrust spherical bearing performance”, Tribolgy International Journal Vol.40, No. 3, 522-532.
Ahmad W. Y. Elescandarany, 2018, “The Effect of the Fluid Film Variable Viscosity on the HydrostaticThrust Spherical Bearing Performance in the Presence of Centripetal Inertia and Surface Roughness (Part 1 Un-recessed fitted bearing)”, The International Journal of Mechanical Engineering and ApplicationsVol.6, No. 1, pp. 1-12.
Essam Salem and Farid Khalil, Variable viscosity effects in Externally Pressurized spherical Oil Bearings, Journal of Wear 1978, 50, 221-235.
Keith Brockwell, Scan Decamillo and WaldemarDmochowski, 2001, “Measured temperature characteristics of 152 mm diameter pivoted shoe journal bearings with flooded lubrication”, Tribology Transaction vol. 44, No. 4, 543-550.
B Glavatskih and S De Camillo, 2004, “Influence of oil viscosity grade on thrust pad bearing operation”, Proc. Inst. Mech. Eng. Vol.218, part j: J. Engineering tribology.
Minhui He, Cloud C. Hunter and James M.Byrne,2005, “Fundamentals of Fluid Film”, Journal Bearing Operation and Modeling, Proceedings of the thirty fourth Turbo-machinery Symposium.
Ivan Filipović and DževadBibić, 2010, “Impact of oil viscosity on functional parameters of journal bearings in internal combustion engines”, Gorivaimaziva, 49, 4, 334 - 351
Srinivasan V. 2012, “Analysis of Static and Dynamic Load on the Hydrostatic Bearing with Variable Viscosity Affected by the Environmental Temperature”, Journal of Environmental Research and Development Vol.7, No. 1A, 346-353.
Srinivasan V. 2013, “Analysis of Static and Dynamic Load on Hydrostatic Bearing with Variable Viscosity and Pressure”, Journal of Environmental Research and Development Vol.6 (6s), 4777-4782.
N.B. Naduvinamani and Archana K. Kadadi, 2013, “The effect of viscosity variation on the micro-polar fluid squeeze film lubrication of a short journal bearing”, Advances of Tribology Journal, Vol.2013, Article ID 743987.
Shigang Wang, Xianfeng Du, Mingzhu Li, Zhongliang Cao, Jianjia Wang, 2013,“Analysis of temperature effect on the lubricating state of hydrostatic bearing”, Journal of Theoretical and Applied Information Technology Vol. 48, No. 2, 817-821.
B. Bouchehit, B. Bou-Saïd and M Garcia, 2016, “Static and dynamic performances of refrigerant- lubricated foil bearings”, 7th international conference on advanced concepts in mechanical engineering.
Cameron A. 1981, Basic lubrication theory, Longman.