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Film thickness for different regimes of fluid-film lubrication. [elliptical contacts]
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Dowson, D. Hamrock, B. J. |
| Copyright Year | 1983 |
| Description | Mathematical formulas are presented which express the dimensionless minimum film thickness for the four lubrication regimes found in elliptical contacts: isoviscous-rigid regime; piezoviscous-rigid regime; isoviscous-elastic regime; and piezoviscous-elastic regime. The relative importance of pressure on elastic distortion and lubricant viscosity is the factor that distinguishes these regimes for a given conjunction geometry. In addition, these equations were used to develop maps of the lubrication regimes by plotting film thickness contours on a log-log grid of the dimensionless viscosity and elasticity parameters for three values of the ellipticity parameter. These results present a complete theoretical film thickness parameter solution for elliptical constants in the four lubrication regimes. The results are particularly useful in initial investigations of many practical lubrication problems involving elliptical conjunctions. |
| File Size | 2094526 |
| Page Count | 62 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19830020178 |
| Archival Resource Key | ark:/13960/t19k95m3q |
| Language | English |
| Publisher Date | 1983-05-01 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Formulas Mathematics Elastohydrodynamics Ellipticity Viscosity Pressure Effects Fluid Films Lubrication Elastic Properties Film Thickness Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
