Foam rupture properties of mineral base oils based on molecular dynamics simulation
Foam in lubricating oil increases wear between equipment,and reducing foam in oil can effectively reduce energy consumption.Representative hydrocarbon components of four mineral base oils were selected to construct a molecular simulation system of foam liquid film.The microscopic mechanism of the liquid film rupture process is analyzed through molecular dynamics simulations,and the rupture time of the one-component and mixed-component liquid film is calculated as the stability metric of the liquid film.On this basis,the effects of base oil structures,the additive and antifoam agent on the rupture time of oil-based foam film are analyzed.The results show that the appearance of initial holes in the process of liquid film rupture will significantly accelerate the rupture process.After adding additives and anti-foam agents to each base oil system,the change in the time of liquid film rupture was consistent with the change in diffusion coefficient,which was in line with the drainage mechanism of foam rupture.This work aims to analyze the stability and rupture mechanism of oil-based foams at the molecular level,and to explore ways to reduce the foam in lubricating oil.
mineral base oilsfoamrupture timemolecular simulationantifoam agent
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