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The Effect of Shear-Thinning on Film Thickness for Space Lubricants |
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| Authors: | Scott Bair Philippe Vergne Mario Marchetti |
| Affiliation: | 1. Georgia Institute of Technology, Center for High Pressure Rheology, George W. Woodruff School of Mechanical Engineering , Atlanta, Georgia, 30332-0405;2. Laboratoire de Mécanique de Contacts , UMR CNRS/INSA 5514, L.E.T., INSA de Lyon Bat. 113, 69621, Villeurbanne cedex, France |
| Abstract: | The authors show that the difference between effective pressure-viscosity coefficients, obtained from film thickness, and coefficients obtained from viscometers for a PFPE space lubricant is substantially the result of shear thinning in the inlet zone of concentrated contact. Flow curves for the PFPE and a multialkylated cyclopentane are presented along with film calculations based on the Carreau model. |
| Keywords: | Non-Newtonian Behavior Viscosity Viscosity-Pressure Behavior Non-Newtonian Lubricants Elastohydrodynamic Lubrication Space Vehicles |