Fluid wetting infiltration in rough rubber contact interface has a directly effect on mechanical lubrication and seal. To clarify its mechanism, contact property and fluid wetting infiltration process with time in rough rubber‐glass contact interface were obtained with an in situ observation instrument. The effect of wetting on the fluid infiltration area ratio at interface was analysed. Experimental results indicated that fluid wetting infiltration at interface was more tended to occur in high‐contact area ratio zone, and empty contact area was more likely to occur in low‐contact area ratio zone. Meanwhile, wetting had an obviously affected on fluid infiltration area ratio at interface. When contact angle of rubber‐liquid interface was 20°, the fluid could almost infiltrate the whole empty contact area of the interface. With the increase of contact angle of rubber‐liquid interface, the area of fluid infiltration was decreased. At last, liquid was completely excluded from the rough rubber‐glass contact interface as contact angle was bigger than 75°. Detailed research indicated that the fluid infiltration in the rough contact interface was the flowing of fluid in microchannels. The comparison of the capillary pressure with viscous drag force was the fundamental evaluation index for fluid infiltration at interface. In high‐contact area ratio zone, the size of microchannels was small, and the capillary pressure was more likely to overcome the viscous drag force of solid‐liquid interface. But in low‐contact area ratio zone, the situation was just the opposite. The microchannel size and surface tension of fluid were the effect factors of capillary pressure.

中文翻译：

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橡胶-玻璃粗糙接触界面的流体润湿渗透特性及机械驱动机理

粗糙的橡胶接触界面中的流体润湿渗透直接影响机械润滑和密封。为了阐明其机理，使用现场观察仪器获得了在粗糙的橡胶玻璃接触界面中的接触性能和流体润湿渗透过程随时间的变化。分析了润湿对界面流体渗透面积比的影响。实验结果表明，高接触面积比区域更容易发生界面润湿渗入，低接触面积比区域更容易发生空接触区域。同时，润湿对界面流体渗透面积比有明显影响。当橡胶-液体界面的接触角为20°时，流体几乎会渗入界面的整个空接触区域。随着橡胶-液体界面接触角的增加，流体渗透面积减小。最后，由于接触角大于75°，因此完全从粗糙的橡胶玻璃接触界面中排除了液体。详细的研究表明，粗糙接触界面中的流体渗透是流体在微通道中的流动。毛细管压力与粘性阻力的比较是界面流体渗透的基本评价指标。在高接触面​​积比区域，微通道的尺寸很小，毛细管压力更有可能克服固液界面的粘性阻力。但是在低接触面积比区域，情况恰好相反。流体的微通道尺寸和表面张力是毛细管压力的影响因素。