نتایج جستجو برای: elasto hydrodynamic lubrication problems

تعداد نتایج: 614435  

2015
C. Hubert K. J. Kubiak M. Bigerelle L. Dubar

This paper proposes a new method of 3D roughness peaks curvature radius calculation and its application to tribological contact analysis as a characteristic signature of tribological contact. This method is introduced through the classical approach of calculation of radius of asperity in 2D. Actually, the proposed approach provides a generalization of Nowicki's method [1], depending on horizont...

Journal: :Physical review letters 2011
Ivan U Vakarelski Jeremy O Marston Derek Y C Chan Sigurdur T Thoroddsen

We demonstrate and quantify a highly effective drag reduction technique that exploits the Leidenfrost effect to create a continuous and robust lubricating vapor layer on the surface of a heated solid sphere moving in a liquid. Using high-speed video, we show that such vapor layers can reduce the hydrodynamic drag by over 85%. These results appear to approach the ultimate limit of drag reduction...

Journal: :PloS one 2015
Xiaoli Yu Zheng Sun Rui Huang Yu Zhang Yuqi Huang

Thermal effects such as conduction, convection and viscous dissipation are important to lubrication performance, and they vary with the friction conditions. These variations have caused some inconsistencies in the conclusions of different researchers regarding the relative contributions of these thermal effects. To reveal the relationship between the contributions of the thermal effects and the...

Journal: :Soft matter 2016
Rogerio Manica Evert Klaseboer Derek Y C Chan

The rise and impact of bubbles at an initially flat but deformable liquid-air interface in ultraclean liquid systems are modelled by taking into account the buoyancy force, hydrodynamic drag, inertial added mass effect and drainage of the thin film between the bubble and the interface. The bubble-surface interaction is analyzed using lubrication theory that allows for both bubble and surface de...

Journal: :Physical review letters 2016
John R Royer Daniel L Blair Steven D Hudson

Colloidal shear thickening presents a significant challenge because the macroscopic rheology becomes increasingly controlled by the microscopic details of short ranged particle interactions in the shear thickening regime. Our measurements here of the first normal stress difference over a wide range of particle volume fractions elucidate the relative contributions from hydrodynamic lubrication a...

Journal: :TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C 1985

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