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当微尺度气体润滑轴承的间隙达到数nm时,固体表面与气体分子间的Van der Waals力对气体轴承的性能会产生不可忽视的影响。该文假设轴承壁面对气体分子存在Van der Waals作用力,并利用DSMC(direct simulation Monte Carlo)方法结合分子在表面力作用下的运动算法,研究了该作用力的强度和作用范围对微尺度气体润滑的影响。结果表明:气体轴承中分子密度的分布与不考虑表面力时相比发生了改变,与表面力的作用强度和作用距离有关;壁面的吸引力加剧了分子在壁面附近的聚集,排斥力则相反。
When the gap between micro-scale gas-lubricated bearings reaches several nanometers, the Van der Waals force between the solid surface and the gas molecules can have an insignificant effect on the performance of the gas bearing. This paper assumes that there is Van der Waals force acting on the gas molecules in the bearing wall. Using the DSMC (direct simulation Monte Carlo) method and the motion algorithm of the molecules under the surface force, the effects of the strength and scope of the force on the microscale gas Effect of lubrication. The results show that the distribution of molecular density in the gas bearing changes compared with that without considering the surface force, which is related to the strength of the surface force and the action distance. The attractive force of the wall aggravates the aggregation of the molecules in the vicinity of the wall and the repulsive force is opposite .