Asymmetric surface textures decrease friction with Newtonian fluids in full film lubricated sliding contact

Jonathon K. Schuh, Randy H Ewoldt

Research output: Contribution to journalArticle

Abstract

Surface texturing can decrease friction in lubricated sliding contact. The majority of existing experimental work has focused on symmetric-depth-profile surface textures. This experimental work examines asymmetric-depth-profile surface textures using gap-controlled experiments with Newtonian fluids on a custom tribo-rheometer setup. Measurements of normal force and shear load are reported as a function of texture geometry, gap height, and bi-directional sliding velocity. This work shows that, in the absence of cavitation, surface texture depth symmetry must be broken to produce normal forces (through viscous effects) for gap-based Reynolds Number up to Reh=ρVhη=1.21. Asymmetric surface textures reduce shear stress and generate normal load, and therefore decrease the effective friction coefficient, which we observe to be smallest for the shallowest texture angle tested, β=5.3°.

Original languageEnglish (US)
Pages (from-to)490-498
Number of pages9
JournalTribology International
Volume97
DOIs
StatePublished - May 1 2016

Fingerprint

sliding contact
Newtonian fluids
Contacts (fluid mechanics)
friction
textures
Textures
Friction
Fluids
rheometers
Texturing
Rheometers
profiles
cavitation flow
Cavitation
coefficient of friction
shear stress
sliding
Shear stress
Loads (forces)
Reynolds number

Keywords

  • Full film lubrication
  • Gap-control
  • Reynolds number
  • Surface textures

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Asymmetric surface textures decrease friction with Newtonian fluids in full film lubricated sliding contact. / Schuh, Jonathon K.; Ewoldt, Randy H.

In: Tribology International, Vol. 97, 01.05.2016, p. 490-498.

Research output: Contribution to journalArticle

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