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• W4327712648 abstract "Abstract In internal combustion piston engines, the formation of an oil film is completely different than in industrial machines. The molecular adhesion force at the interface between the surface coating of engine parts and the lubricating oil determines the load-carrying capacity and the ability to form a lubricated film. The geometry of the lubricating wedge between the surfaces of the piston rings and the cylinder wall is created by the thickness of the oil film and the height of the ring's coverage with lubricating oil. This condition is affected by many parameters characterizing the engine operation and physical and chemical parameters of the coatings of the cooperating pairs. For lubricant particles reaching high energies higher than the potential energy barrier for adhesive attraction at the interface, slippage occurs. Therefore, the value of the contact angle of the liquid on the surface of the coating depends on the value of the intermolecular force of attraction. According to the author, there is a strong relationship between the contact angle and the lubrication effect. The paper shows that the surface potential energy barrier is a function of the contact angle and contact angle hysteresis (CAH). The innovation of the work consists in examining the contact angle and CAH in the conditions of thin layers of lubricating oil in cooperation with hydrophilic and hydrophobic coatings. The thickness of the lubricant film was measured under various speed and load conditions using optical interferometry. The work shows that CAH is a better interfacial parameter to correlate with the effect of hydrodynamic lubrication. The paper presents mathematical relationships in relation to a piston engine, various coatings and lubricants." @default.
• W4327712648 created "2023-03-18" @default.
• W4327712648 creator A5054382006 @default.
• W4327712648 date "2023-03-17" @default.
• W4327712648 modified "2023-10-16" @default.
• W4327712648 title "The theory of the surface wettability angle in the formation of an oil film in internal combustion piston engines" @default.
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• W4327712648 doi "https://doi.org/10.21203/rs.3.rs-2609101/v1" @default.
• W4327712648 hasPublicationYear "2023" @default.
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