NDLI: Basic lubrication equations

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Basic lubrication equations

Content Provider	NASA Technical Reports Server (NTRS)
Author	Dowson, D. Hamrock, B. J.
Copyright Year	1981
Description	Lubricants, usually Newtonian fluids, are assumed to experience laminar flow. The basic equations used to describe the flow are the Navier-Stokes equation of motion. The study of hydrodynamic lubrication is, from a mathematical standpoint, the application of a reduced form of these Navier-Stokes equations in association with the continuity equation. The Reynolds equation can also be derived from first principles, provided of course that the same basic assumptions are adopted in each case. Both methods are used in deriving the Reynolds equation, and the assumptions inherent in reducing the Navier-Stokes equations are specified. Because the Reynolds equation contains viscosity and density terms and these properties depend on temperature and pressure, it is often necessary to couple the Reynolds with energy equation. The lubricant properties and the energy equation are presented. Film thickness, a parameter of the Reynolds equation, is a function of the elastic behavior of the bearing surface. The governing elasticity equation is therefore presented.
File Size	2493050
Page Count	92
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19820008539
Archival Resource Key	ark:/13960/t3qv8bq48
Language	English
Publisher Date	1981-12-01
Access Restriction	Open
Subject Keyword	Mechanical Engineering Elastohydrodynamics Navier-stokes Equation Viscosity Pressure Dependence Temperature Dependence Newtonian Fluids Continuity Equation Lubrication Elastic Properties Equations of Motion Film Thickness Reynolds Equation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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