Numerical simulation of bearing force over bit patterned media using 3D DSMC method

This paper uses the three-dimensional direct simulation Monte Carlo method to investigate the bearing force over bit patterned media in the filling gases of air and helium under different conditions, including ambient temperature, rotation speed of disk, slider surface temperature, flying attitude of slider, and velocity loss during the collision process between gas molecules and slider in the HDD. The results show that the increase in the ambient temperature results in a nearly linear increase of the bearing force acting on slider in fully sealed HDD and the bearing force acting on slider slightly decreases with the increase of the ambient temperature in not sealed HDD. Moreover, the increase in disk rotation speed and slider surface temperature results to the increase of the bearing force and the resistance acting on disk. The change in flying attitude and the increase of velocity loss, however, cause decrease in the bearing force.