Effect of micro protrusions on the performance of elliptical journal bearings operating with couple stress lubricant
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University of Babylon
University of Babylon, College of Engineering / Al-Musayab, Automobile Engineering Department, Babylon, Almusyab-Iraq
Basim Ajeel ِAbass   

University of Babylon
Submission date: 2021-02-10
Final revision date: 2021-06-01
Acceptance date: 2021-06-05
Online publication date: 2021-06-10
Publication date: 2021-06-10
Diagnostyka 2021;22(2):97–104
Elliptical bearing is characterized by low induced temperature and high stability at higher speed in comparison with the cylindrical journal bearing. The performance of such bearings can be affected by the type of oil used and its surface properties. The main goal of this work is to study the surface micro protrusion effect on the steady state operation of elliptical journal bearing lubricated with a couple stress lubricant. The modified Reynolds’ equation to take into account the effects of couple stress lubricant and micro protrusions of the bearing surfaces is solved using finite difference method. The governing equations were solved using a prepared FORTRAN computer program. Pressure distribution, load carrying capacity and coefficient of friction have been studied for a bearing in the laminar flow regime. The mathematical model was validated by comparing pressure results for the elliptical bearing of the present work with that obtained by Hussain et al.(1996). The obtained results demonstrate that the lubricant pressure and the load carried by the bearing decrease for the bearing with higher ellipticity factor while the load carried by the bearing increases for the bearing with higher protrusions or when using a couple stress fluid with higher couple stress variable.
Xiao-Li Wang, Ke-Qin Zhu, Shi-Zhu Wen. Thermo-hydrodynamic analysis of journal bearings lubricated with couple stress fluids. Tribology International 2001; 34: 335–343.
Yan-Yan Ma, Wei-Hua Wang, Xian-Hua Cheng. A study of dynamically loaded journal bearings lubricated with non-Newtonian couple stress fluids. Tribology Letters. 2004;17(1):69-74.
Hsiu-Lu Chiang, Cheng-Hsing Hsu, Jaw-Ren Lin. Lubrication performance of finite journal bearings considering effects of couple stresses and surface roughness. Tribology International 2004; 37: 297–307.
Crosby WA, Chetti B. The static and dynamic characteristics of a two-lobe journal bearing lubricated with couple-stress fluid. Tribology Transactions. 2009;52:262-268.
Faisal Rahmani, Jayanta K. Dutt, Raj K. Pandey. performance behavior of elliptical-bore journal bearings lubricated with solid granular particulates. Particuology. 2016;27:51-60.
Chetti B. Elastohydrodynamic Analysis of an offset journal bearing lubricated with couple stress fluid. International Journal of Engineering Research in Africa. 2010;2:53-62.
Amit Chauhan, Rakesh Sehgal, Rajesh Kumar Sharma. Thermo hydrodynamic analysis of elliptical journal bearing with different grade oils. Tribology International. 2010;43:1970–1977.
Amit Singla, Amit Chauhan. Experimental evaluation of lubricating oil film pressure and temperature of elliptical non-circular journal bearing profile. Proceedings of 2015; RAECS UIET Panjab University Chandigarh.
Singla A, Chauhan A. Evaluation of oil film pressure and temperature of an Elliptical Journal Bearing - An Experimental Study. Tribology in Industry. 2016;38(1):74-82.
Amit Chauhan, Rakesh Sehgal, Rajesh Kumar Sharma. Investigations on the thermal effects in non-circular journal bearings. Tribology International 2011;44:1765–1773.
Amit Singla, Amit Chauhan. Experimental study for performance evaluation of steadily loaded true elliptical and orthogonally displaced non-circular journal bearing profiles. Industrial Lubrication and Tribology. 2016;68(6):702-711.
Rajeev Kumar Dang, Amit Chauhan, Dhami SS. Static thermal performance evaluation of elliptical journal bearings with nano-lubricants. Proc IMechE Part J: Journal of Engineering Tribology 2020;2:1-13.
Prakash Chandra Mishra. Isothermal analysis of elliptic bore journal bearing considering isotropic roughness. International Journal of Mechanical & Mechatronics Engineering 2012; 12(4): 24-31.
Mishra PC. Analysis of a rough elliptic bore journal bearing using expectancy model of roughness characterization. Tribology in Industry 2014; 36(2): 211-219.
EL-Said AKH, EL-Souhily BM, Crosby WA, EL-Gamal HA. The performance and stability of three-lobe journal bearing textured with micro protrusions. Alexandria Engineering Journal 2017; 56(4):423-432.
Marco TC. Faria. Finite element analysis of oil-lubricated elliptical journal bearings. International Journal of Mechanical, Aerospace, Industrial and Mechatronics Engineering 2015; 9(5): 628-633.
Boualem Chetti. The effect of turbulence on the performance of a two-lobe journal bearing lubricated with a couple stress fluid. Industrial Lubrication and Tribology. 2016;68(3):336–340.
Maulik Ukania, Puneet Mathur. The static and dynamic characteristic of elliptical journal bearing lubricated with couple-stress fluid. International Conference on Advancements in Computing & Management (ICACM-2019).
Vishwanath B. Awati, Ashwini Kengangutti. Surface roughness effect on thermohydrodynamic analysis of journal bearings lubricated with couple stress fluids. Nonlinear Engineering 2019;8:397–406.
Punit Kumar, Rohilla, Rajive Verma, Suresh Verma. Performance analysis of couple stress fluid operated elastic hydrodynamic journal bearing, Tribology on line 2019;13(3): 143-154.
Tyrone Dass, Sreedhara Rao Gunakala, Donna M.G. Comissiong. The combined effect of couple stresses, variable viscosity and velocity-slip on the lubrication of finite journal bearings. Ain Shams Engineering Journal 2020;11:501–518.
Navin Kumar, Akash Shukla, Sanjay Bansal, Chandra B Khatri, Gannath D Thakre, Saurabh K Yadav, Satish C Sharma, Suraj P Harsha. Thermo-hydrodynamic simulation study of twin-groove elliptical (two-lobe) journal bearing of steam turbine with experimental investigations. Proc IMechE Part J: J. Engineering Tribology 2020:1–20.
Bhaskera B, Seetharamaiahb N, Ramesh Babu P. Experimental investigations on elliptical journal bearing using hydrol 68 lubricating oil. AIP Conference Proceedings 2317, 030023 2021.
Hussain A, Mistry K, Biswas S. Thermal Analysis of Noncircular Bearings. Transactions of the ASME.1996;18:246-254.