分子動力学によるトラクションフルードの温度依存ダイナミクス

抄録

Traction drive is a mechanism that transmits power by a rotor and lubricating oil. To evaluate the characteristics of the fluid molecules in the traction drive, we construct a simulation method to apply shear to the fluid confined between solids using LAMMPS, a molecular dynamics simulator. In this simulation, conditions are set as follows. Fluid is composed of a single hydrocarbon compound and the number of atoms is about ten thousand. The solids are a model metal surface imitating (100) plane of α-iron, and their atomic motion is frozen. Apply a pressure of 1.24 GPa in the direction perpendicular to the solid atoms. Furthermore, a constant slip of relative sliding speed 50 m/s is applied. Then, the simulation time on the order of nanoseconds is passed and the steady state is set. The temperature dependency of the coefficient of traction is evaluated by changing the temperature of the fluid from -20 oC to 140 oC. The coefficient of traction also changes with the change of temperature, and the tendency is at least qualitatively consistent with the experimental values.