Characteristics of micro-gas journal bearings based on kinetic theory

Xiang Jin Rao, Kuo Ming Chang, Wang Long Li

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


According to Poiseuille and Couette flow rate correctors, Q̃p(D,α1,α2) and Q̃C(D,α1,α2), the modified molecular gas lubrication (MMGL) equation is applied for the analysis of micro-gas journal bearings. The effects of gas rarefaction are considered for arbitrary inverse Knudsen numbers (D) and non-symmetric accommodation coefficients (AC) conditions (α1≠α2). The combined effects of Q̃p(D,α1,α2) and Q̃C(D,α1, α2) on the performance of micro-gas journal bearings are firstly discussed. The results show that the surface property (AC) of moving surface affects the bearing performance more significantly than that of stationary surface does. The load carrying capacity increases as the AC of moving surface increases or the inverse Knudsen number increases.

Original languageEnglish
Pages (from-to)241-247
Number of pages7
JournalTribology International
Issue number3
Publication statusPublished - 2011 Mar

All Science Journal Classification (ASJC) codes

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


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