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Baidya, Ujjal
- Effect of Surface Roughness on the Pressure Generation in a Finite Rough Hydrodynamic Journal Bearing under Micropolar Lubrication in Steady-State
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Authors
Affiliations
1 Govt. Polytechnic, Lakhisarai, Bihar, IN
2 Technosoft Electronics Pvt. Ltd., Mumbai, IN
3 Department of Engineering and Technological Studies, University of Kalyani , Kalyani, West Bengal, IN
4 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani, West Bengal, IN
1 Govt. Polytechnic, Lakhisarai, Bihar, IN
2 Technosoft Electronics Pvt. Ltd., Mumbai, IN
3 Department of Engineering and Technological Studies, University of Kalyani , Kalyani, West Bengal, IN
4 Department of Mechanical Engineering, Kalyani Government Engineering College, Kalyani, West Bengal, IN
Source
Reason-A Technical Journal (Formerly Reason-A Technical Magazine), Vol 15 (2016), Pagination: 39-53Abstract
In hydrodynamic lubrication of journal bearing pressure of the fluid film is generated as a result of the viscous drag of the fluid into the wedge shaped gap between the journal and bearing due to relative motion of the journal with respect to the bearing. The pressure development of fluid is important in this type of lubrication to ensure performance of journal bearing. On the other hand, every surface has some degree of roughness that affects relative motion of the journal bearing system. This paper, thus, aims to present a detailed study of hydrodynamic pressure built up of a journal bearing including the roughness of the surfaces. The modified Reynolds equation is derived on the basis of theory of micropolar lubrication incorporating suitable roughness model. The resulting equation is solved numerically at steady state operating condition using cavitation boundary condition to observe distribution of pressure. The effects of variations in operating variables in terms of characteristic of lubricant and parameters defining roughness model are computed. The analytical results are compared with the available published results to validate the theory and computer code. The numerical result shows that for same geometrical condition maximum pressure developed in micropolar fluid always remain higher than that in Newtonian fluid. The steady state pressure is found to be decreased as the values of the roughness parameters are increased.Keywords
Hydrodynamic Bearing, Micropolar Lubrication, Roughness, Steady State, Pressure Profile.Full Text
References
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- Analyzing Short Porous Hydrodynamic Journal Bearing Numerically Considering Micropolar Lubrication and Isotropic Roughness
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Authors
Affiliations
1 Dept. of Mechanical Engg., Medinipur Sadar Govt. Polytechnic College, Khasjungle-721102, IN
2 Dept. of Engineering and Technological Studies, Kalyani University, Kalyani - 741235, IN
3 Dept. of Mechanical Engg., Kalyani Govt. Engg. College, Kalyani - 741235, IN
1 Dept. of Mechanical Engg., Medinipur Sadar Govt. Polytechnic College, Khasjungle-721102, IN
2 Dept. of Engineering and Technological Studies, Kalyani University, Kalyani - 741235, IN
3 Dept. of Mechanical Engg., Kalyani Govt. Engg. College, Kalyani - 741235, IN
Source
Journal of the Association of Engineers, India, Vol 90, No 1-2 (2020), Pagination: 56-73Abstract
In present days of high speed machines and machinery, the aim to reduce the energy loses becomes a major aspect of research for economic reasons and long-term reliability. It is known that an industrial nation can save about 1% of gross national product by better tribological exercises. Many modern machines use porous bearings for its ability to act as a lubricant reservoir. The lubricant used in the open adverse operating situations gets contaminated with worn-out particles and dust, and can be better studied by micropolar lubrication theory. Moreover, machined surfaces always have some degree of roughness which adds to the loss of energy. The present work aims at clubbing the effect of roughness in hydrodynamic lubrication using micropolar fluid with a thin porous bush assuming the velocity slip of lubricant film at the porous bush and fluid film junction. The governing equation for fluid pressure in the porous matrix and hydrodynamic film zone are developed following Darcy’s equation and hydrodynamic micropolar lubrication theory, considering Christensen’s stochastic model of roughness. The bearing is approximated as a short one. Modified Reynold’s equation is numerically solved to compute fluid film pressure in steady-state condition. Friction parameters and non-dimensional load capacity in terms of roughness parameters and porous bearing characteristics are presented in case of Newtonian and micropolar fluids.Keywords
Micropolar Lubricant, Porous Journal Bearing, Stochastic Roughness.
References
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- Evaluation of Linear Stability of Porous Hydrodynamic Journal Bearings under Micropolar Lubrication Condition
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Authors
Affiliations
1 Department of Mechanical Engineering, Bipradas Pal Chowdhury Institute of Technology, Krishnanagar-741101, IN
2 Department of Engineering and Technological Studies, Kalyani University, Kalyani-741235, IN
3 Department of Mechanical Engineering, Kalyani Govt. Engineering College, Kalyani-741235, IN
1 Department of Mechanical Engineering, Bipradas Pal Chowdhury Institute of Technology, Krishnanagar-741101, IN
2 Department of Engineering and Technological Studies, Kalyani University, Kalyani-741235, IN
3 Department of Mechanical Engineering, Kalyani Govt. Engineering College, Kalyani-741235, IN
Source
Indian Science Cruiser, Vol 37, No 1 (2023), Pagination: 16-27Abstract
This theoretical investigation has been performed to explore the dynamic performance characteristics of micropolar lubricated porous hydrodynamic journal bearing considering slip effect along tangential direction. The properties of finite porous hydrodynamic journal bearings and micropolar lubricant and the Beavers-Joseph slip model are combined to reestablish the modified Reynolds equation. Dynamic nature of the bearing can be obtained by implementation of the first order perturbation technique in bearing properties. This research work on micropolar lubricated porous hydrodynamic journal bearing in dynamic condition has produced superior linear stability as compared to lubrication using Newtonian fluid.Keywords
Micropolar lubricant; critical mass parameter; whirl ratio; porous bearing.References
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