Mechanism of Levitation of a Slider with a Micro/Nanoscale Surface Structure on a Rotating Disk
Mechanism of Levitation of a Slider with a Micro/Nanoscale Surface Structure on a Rotating Disk
复制标题
转盘上微纳尺度表面结构滑块的悬浮机理
DOI：
10.1007/s11249-014-0368-2
复制
发表时间：
2014
影响因子：
3.2
通讯作者：
Toshiyuki Takagi
中科院分区：
文献类型：
--
作者：
Shigeru Yonemura;Susumu Isono;Masashi Yamaguchi;Yoshiaki Kawagoe;Takanori Takeno;Hiroyuki Miki;Toshiyuki Takagi
先前已经报道，随着相对速度的增加，部分抛光的金刚石涂覆表面和金属表面之间的摩擦在大气中急剧减小到零（Nakamori等人，Diam Relat Mater 14：2122-2126，2005）。另一方面，还报道了激光纹理化表面在气体润滑的情况下具有良好的摩擦学性能（Kligerman和Etsion，Tribol Trans 44：472-478，2001）。上述两种情况下的表面具有微米/纳米级结构。预计这两个表面通过相同的机制由滑动表面之间的高压气体膜悬浮。在目前的工作中，高气压产生的机制是明确的数值模拟和理论分析的性能。发现织构化表面上的压力分布的以下两个特征引起高气压。首先，在凹坑区域上，气体压力在相对表面的运动方向上增加。第二，在平坦区域上的压力分布是向上凸起的，因此，在凹窝出口处获得的高压在平坦区域中保持很长的距离。这种压力分布的原因在这里解释分析。文中还讨论了压力分布的控制因素和在重复斑图周期内的最佳凹坑位置。此外，这里获得的知识被用来设计表面结构，以获得高气压。
It has been previously reported that the friction between a partially polished diamond-coated surface and a metal surface was drastically reduced to zero in the atmosphere as relative speed was increased (Nakamori et al. in Diam Relat Mater 14:2122–2126, 2005). On the other hand, it has also been reported that laser-textured surfaces have good tribological performance in the case of gas lubrication (Kligerman and Etsion in Tribol Trans 44:472–478, 2001). The surfaces in the aforementioned two cases have a micro/nanoscale structure. It is expected that both surfaces are levitated by a high-pressure gas film between sliding surfaces by the same mechanism. In the present work, the mechanism of high gas pressure generation is clarified by the performance of numerical simulations and by theoretical analysis. The following two features of pressure distributions on textured surfaces were found to induce high gas pressure. First, gas pressure increases in the direction of the counter surface’s motion over the dimple region. Second, the pressure distribution over the flat region is convex upward, and hence, the high pressure obtained at the outlet of the dimple is maintained for a long distance in the flat region. The causes of such pressure distributions are herein explained analytically. The governing factor of pressure distributions and the optimal dimple location in the period of the repeated surface pattern are also discussed. Furthermore, the knowledge obtained here is utilized to design the surface structure to obtain high gas pressure.