Modified average Reynolds equation for ultra-thin film gas lubrication considering roughness orientations at arbitrary Knudsen numbers

Wang Long Li, Cheng I. Weng

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

In this paper, the effects of roughness orientations and molecular mean free path on the roughness-induced flows are discussed. Based on the newly-proposed modified Reynolds equation, the flow factors are derived in compact forms by using the perturbation approach and the coordinate transformation. The flow factors are expressed as functions of surface characteristics (roughness orientation angles, Peklenik numbers and standard deviations of bearing surfaces) and gas rarefraction parameters (inverse Knudsen numbers). In the result, a comparison of several approximations of the rarefied gas models is discussed. Finally, the static performance of a magnetic recording head under ultra-thin spacing conditions with roughness and rarefaction effects taken into account is analyzed.

Original languageEnglish
Pages (from-to)292-300
Number of pages9
JournalWear
Volume209
Issue number1-2
DOIs
Publication statusPublished - 1997 Aug

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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