| ZHANG Xiang,LIU Xiao-ling,SUN Wen-dong,GUO Feng.Modeling and Analysis of Thermal EHL System Considering Adsorption Film on Surfaces[J],51(3):57-65 |
| Modeling and Analysis of Thermal EHL System Considering Adsorption Film on Surfaces |
| Received:April 09, 2021 Revised:August 25, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.005 |
| KeyWord:surface adsorption film EHL thermal effect thermal conductivity of the steel non-Newtonian fluid friction coefficient |
| Author | Institution |
| ZHANG Xiang |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| LIU Xiao-ling |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| SUN Wen-dong |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| GUO Feng |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
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| Abstract: |
| The purpose of this paper is to investigate the mechanism of surface adsorption film in thermal elastohydrodynamic lubrication (EHL). A non-Newtonian thermal EHL model of point contact with surface adsorption film was built, and effects of the non-Newtonian characteristics of the lubricant, the adsorption film and the thermal conductivity of the steel on thermal EHL performance were analyzed. Results show that, the non-Newtonian characteristics of the lubricant and the adding of adsorption film have almost no effects on the oil film pressure and thickness. Compared with Newtonian fluid, the non-Newtonian fluid can provide lower film temperature rise and friction coefficient. In addition, as the characteristic shear stress of non-Newtonian fluid increases, both the mid-layer film temperature and the surface temperature of the adsorption film increase. Due to the adsorption film, the temperature rise of the oil film increases significantly, but the friction coefficient decreases. The friction coefficient of the friction pair surface decreases gradually with the increase of the entrainment velocity. At the same entrainment velocity, the friction coefficient decreases with the increasing thickness of the adsorption film. Different from thermal conductivity of steel used in traditional thermal EHL, the appropriate thermal conductivity leads to larger secondary pressure peak, less minimum film thickness and friction coefficient, and higher oil film temperature. Thermal EHL performance is influenced by the non- Newtonian characteristics of the lubricant, the adsorption film and the thermal conductivity of the steel. Therefore, it is necessary to consider the effect and mechanism of surface adsorption film in the thermal EHL system. |
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