Engineering Mechanics

Proceedings Vol. 23 (2017)

ENGINEERING MECHANICS 2017

Copyright © 2017 Brno University of Technology, Faculty of Mechanical Engineering, Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno

 

Dočkal K., Šperka P., Křupka I., Hartl M.
pages 274 - 277, full text

Lubricant flow in an elastohydrodynamic contact is investigated by new methodology based on particle tracking velocimetry. Measurement method provides positions of silver nanoparticles dissolved in the lubricant through several images captured by high speed camera. These are connected, in places of high probability of correct detection of identical particle on multiple images. Connected positions are linearly fitted to get average speed and after that statistically processed to obtain velocity profile. This method was applied on 5P4E base fluid, characterized by high viscosity and pressure sensitivity. Experimental results provide evidence about slide to roll ratio influence on the velocity profiles under piezoviscouse conditions. At low slide to roll ratios the profile shape match plug flow model with highly viscous core and slip on the solid-liquid interfaces. As the slide to roll ratio increases, corresponding velocity profile curvature is reduced.

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