Numerical Analysis Of Influence Of Electric Double Layer On Thin Film Lubrication

Near the interface of solid and liquid, Electric Double Layer (EDL) presents electro-viscous effect which makes fluid viscosity increase. The present researches of EDL are all based on Newtonian fluid model, but lubrication oil in thin film lubrication shows the property as a non-Newtonian fluid. In this paper, numerical analysis was carried out to study electro-viscous effect in thin film lubrication.The main research work in this dissertation is as follows:1. The functions of lubricant properties with parameters of EDL are founded. A mathematical model of electro-viscous effect was developed.2. Software for Newtonian EHL (Elastohydrodynamic Lubrication) and ideal viscoplastic EHL line contact problem are drawn up respectively. Numerical calculation shows that the electro-viscosity makes film thickness increase significantly, but has little effect on pressure distribution.3. Software for Newtonian thin film lubrication face contact problem is draw up. Numerical calculation shows that the electro-viscosity makes both loading carrying capacity and friction coefficient increase.4. Equivalent viscosity model considering EDL and layer structure is constructed and the respective software is draw up. Numerical calculation shows that the electro-viscosity has more influence on both loading carrying capacity and friction coefficient.The analysis results are generally correct and valuable for theoretical studies of the thin film lubrication and practical engineering calculations.