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Friction characteristics of microtextured surfaces under hydrodynamic lubrication

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Title: Friction characteristics of microtextured surfaces under hydrodynamic lubrication
Author(s): Ramesh, Ashwin
Advisor(s): King, William P.
Department / Program: Mechanical Sci & Engineering
Discipline: Mechanical Engineering
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: M.S.
Genre: Thesis
Subject(s): Surface engineering microtexturing hydrodynamic lubrication texture Navier-Stokes
Abstract: Surface microtexturing has shown significant promise over the past decade as one of the surface engineering methods to modify friction performance. We tackle two important problems associated with surface texturing – developing low cost scalable manufacturing technique and engineering design rules for fluid power applications. We report experimental and numerical investigation of the friction characteristics of microtextured surfaces. The textures are of size 28-257 um on stainless steel surfaces, fabricated using micro-casting. Friction characteristics of these surfaces were tested under submerged condition using a pin-on-disk configuration. Numerical simulations solved the Navier-Stokes equations to predict the texture-induced lift. During hydrodynamic lubricated sliding, the textured surfaces exhibit friction as much as 80% lower than the untextured surfaces. We study the effect of operating conditions on the friction performance of the surfaces for different textures. The trends obtained in the experiments match well with the simulations, and indicate design rules for the implementation of this technology.
Issue Date: 2012-09-18
Rights Information: Copyright 2012 Ashwin Ramesh
Date Available in IDEALS: 2012-09-18
Date Deposited: 2012-08

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