NANOMETRIC THICKNESS EHL OIL FILMS

摘要

EHD oil films possess a remnant thickness of 10-20 nm at very low speeds. This behavior was justified numerically using an empirical equation for wall viscosity. This paper uses molecule-wall interaction potential and finds that the viscosity decreases exponentially with the distance to the wall. A thin attached layer, responsible for remnant oil film, is generated by wall attraction. At high speeds, EHD film occurs between attached layers. The effect of pressure and temperature is evidenced and thickness of nano-EHD oil film is found.