Abstract Ex-poro-hydrodynamic (XPHD) lubrication is a biomimetic-inspired lubrication mechanism consisting of self-sustained fluid films generated within highly compressible porous layers imbibed with liquids, whose solid phase induces compressive elastic forces that are negligible compared to the hydrodynamic forces generated inside the porous medium. This work focuses on the performance of XPHD lubrication in the context of tangential movement, adapted to the case of thrust bearings at low and medium rotational speeds. An in-depth study of a pre-selected porous material (polyurethane foam) was carried out in order to determine the physical characteristics and the crucial parameters for XPHD lubrication, namely the porosity and the permeability. The paper also proposes a theoretical and numerical model of XPHD lubrication. Classical lubrication assumptions are used, and flow within the porous medium is predicted using a new form of the Reynolds equation. A specially developed test rig allows for an experimental study of the XPHD lubrication mechanism. Finally, a comparison of the modeling and experimental results is presented.

中文翻译：

---

在吸收液体的高度可压缩多孔层中产生的自持流体膜的实验和数值研究

摘要 Ex-poro-hydrodynamic (XPHD)润滑是一种仿生润滑机制，由在吸收液体的高度可压缩多孔层内产生的自持流体膜组成，其固相产生的压缩弹性力与产生的流体动力相比可以忽略不计。多孔介质内部。这项工作的重点是在切向运动的背景下 XPHD 润滑的性能，适用于推力轴承在中低转速下的情况。对预选的多孔材料（聚氨酯泡沫）进行了深入研究，以确定 XPHD 润滑的物理特性和关键参数，即孔隙率和渗透率。本文还提出了 XPHD 润滑的理论和数值模型。使用经典润滑假设，并使用雷诺方程的新形式预测多孔介质内的流动。专门开发的测试台允许对 XPHD 润滑机制进行实验研究。最后，给出了建模和实验结果的比较。