Analysis and Comparison of the Models for the Rarefied Gas Effect on Gas Lubrication

Abstract:

Ultrathin gas film lubrication has been widely used in recent years, such as dry gas seal face gas lubrication, gas lubrication in the hard disk drive, etc. The rarefied gas effect must be considered when the gas film thickness is very thin. In order to analyze, compare, and select the appropriate rarefied effect model on gas lubrication, a comparative analysis has been carried out on the influence laws of the Poiseuille flow rate and the ratio of the effective viscosity coefficients and the dynamic viscosity, μ_eff/μ, with inverse Knudsen number, D ,or Knudsen number, K_n, as to different models. The results show that when inverse Knudsen number increases or Knudsen number decreases, the Poiseuille flow rate and the ratio of the effective viscosity coefficients and the dynamic viscosity,μ_eff/μ, of different models approach to each other. However, there are significant differences as to different models when the Knudsen number is large, and only several models from Hwang, Veijola, Peng etc agree with Fukui’s model.

• Periodical: Applied Mechanics and Materials (Volume 577)
• Pages: 289-292
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.577.289
• Online since: July 2014
• Authors: Shuai Zhang*, Peng Yun Song
• Keywords: Gas Lubrication, Poiseuille Flow Rate, Rarefied Gas Effect, Slip Flow

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