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Static Characteristics of Micro Gas-Lubricated Journal Bearings with a Slip Flow
곽현덕(Hyun-Duck Kwak),이용복(Yong-Bok Lee),김창호(Chang-Ho Kim),이남수(Nam-Soo Lee),최동훈(Dong-Hoon Choi) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
The fluid mechanics and operating conditions of gas-lubricated journal bearings in micro rotating machinery such as micro polarization modulator and micro gas turbine are different from their larger size ones. Due to non-continuum effects, there is a slip of gas at the walls. Thus in this paper, the slip flow effect is considered to estimate the pressure distribution and load-carrying capacity of micro gas-lubricated journal bearings as the local Knudsen number at the minimum film thickness is greater than 0.01. Based on the compressible Reynolds equation with slip flow, the static characteristics of micro gas-lubricated journal bearings are obtained. Numerical predictions compare the pressure distribution and load capacity considering slip flow with the performance of micro journal bearings without slip flow for a range of bearing numbers and eccentricities. The results clearly show that the slip flow effect on the static characteristics is considerable and becomes more significant as temperature increases.