Barazzutti Cedric, Cayer-Barrioz Juliette, Mazuyer Denis
Laboratoire de Tribologie et Dynamique des Systèmes, CNRS UMR 5513, École Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France.
Rev Sci Instrum. 2023 Jun 1;94(6). doi: 10.1063/5.0155813.
A model hydrodynamic lubrication tribometer consisting of two hydrodynamic journal bearings working under thin film conditions was developed to investigate the mechanisms of hydrodynamic friction with low-viscosity fluids and the role of surface effects. A small nominal radial clearance of about 5 µm was considered between the two surfaces. This fully instrumented setup provides in situ information on the sheared fluid film in terms of simultaneous measurements of film thickness; localization and extension of the cavitation zone, with a resolution of 30°; nominal friction torques up to 0.5 N m, with an accuracy of 0.05 mN m; temperature; and the position of the shaft for velocities up to 12 000 rpm. To illustrate the capability of the Osiris tribometer, thin hydrodynamic film measurements were performed on smooth surfaces. The results are presented here, and the thermal effects, acceleration, and inertia contributions are discussed. Finally, the influence of the surface topography using textured surfaces was demonstrated and the role of adsorbed layers on the surface due to fluid formulation was highlighted.
开发了一种由两个在薄膜条件下工作的流体动力径向轴承组成的模型流体动力润滑摩擦计，以研究低粘度流体的流体动力摩擦机制和表面效应的作用。两个表面之间的名义径向间隙约为5 µm。这种完全仪器化的装置通过同时测量膜厚，提供了关于剪切流体膜的原位信息；气穴区的定位和扩展，分辨率为30°；名义摩擦力矩高达0.5 N·m，精度为0.05 mN·m；温度；以及转速高达12000 rpm时轴的位置。为了说明奥西里斯摩擦计的性能，在光滑表面上进行了薄流体动力膜测量。这里展示了结果，并讨论了热效应、加速度和惯性贡献。最后，展示了使用纹理表面时表面形貌的影响，并强调了由于流体配方在表面上吸附层的作用。
