Paper Info
Title
Effect of effective viscosity on characteristics of microscale gas journal bearings
Abstract
According to 1st order slip velocity boundary, modified Reynolds equation for microscale gas journal bearings is presented with consideration of effective viscosity of gas under rarefied condition. Modified Reynolds equation is solved using the finite difference method. Non-dimensional pressure distribution, load capacity and attitude angle for microscale gas journal bearings under different reference Knudsen number (the ratio of molecular mean free path to the minimum of gas film thickness), bearing number and eccentricity ratio are obtained. Numerical analysis demonstrates that when the bearing number is constant, the pressure and load capacity decrease and attitude angle changes inversely with the reference Knudsen number increasing. The larger the eccentricity ratio, the larger the change of attitude angle from effective viscosity. When eccentricity ratio is less than 0.6, attitude angle changes softly and the effect of effective viscosity is unobvious. When eccentricity ratio is constant, the influence of effective viscosity on non-dimensional load capacity and attitude angle becomes large with bearing number increasing, and this influence is more prominent with larger reference Knudsen number.
Year
DOI
Venue
2009
10.1109/NEMS.2009.5068540
NEMS
Keywords
Field
DocType
reference knudsen number,attitude angle,bearing number,modified reynolds equation,attitude angle change,microscale gas journal bearing,knudsen number,eccentricity ratio,effective viscosity,attitude angle changes softly,viscosity,finite difference method,numerical analysis,finite difference methods,mean free path,pressure distribution
Mean free path,Composite material,Thermodynamics,Eccentricity (behavior),Microscale chemistry,Knudsen number,Viscosity,Bearing (mechanical),Mechanics,Finite difference method,Reynolds equation,Materials science
Conference
Citations 
PageRank 
References 
0
0.34
0
Authors
3
Name
Order
Citations
PageRank
Haijun Zhang149537.70
Changsheng Zhu223.45
Qin Yang300.68