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In this chapter, the different equations governing the EHL problem are derived in dimensional and dimensionless form. These are: the generalized Reynolds equation, governing the lubricant flow through the contact, the film thickness equation describing the geometry of the contact, the linear elasticity equations governing the elastic deformation of the contacting solids, the load balance equation describing the balance of forces over the contact, the energy equations governing heat generation within the lubricant film and its dissipation through the film and bounding solids and finally, the shear stress equations governing the shear stress distribution within the lubricant film. A section is also offered on the constitutive behavior of lubricants and the dependence of their transport properties on pressure, temperature and shear stress. These dependencies and their accurate description are key for a fundamental understanding of the EHL problem. Then, different dimensionless groups are defined for describing the conditions and operating parameters of an EHL contact. The chapter ends with an overview of the different milestones defining the course of development of EHL numerical modeling.
In this chapter, the different equations governing the EHL problem are derived in dimensional and dimensionless form. These are: the generalized Reynolds equation, governing the lubricant flow through the contact, the film thickness equation describing the geometry of the contact, the linear elasticity equations governing the elastic deformation of the contacting solids, the load balance equation describing the balance of forces over the contact, the energy equations governing heat generation within the lubricant film and its dissipation through the film and bounding solids and finally, the shear stress equations governing the shear stress distribution within the lubricant film. A section is also offered on the constitutive behavior of lubricants and the dependence of their transport properties on pressure, temperature and shear stress. These dependencies and their accurate description are key for a fundamental understanding of the EHL problem. Then, different dimensionless groups are defined for describing the conditions and operating parameters of an EHL contact. The chapter ends with an overview of the different milestones defining the course of development of EHL numerical modeling.
Elastohydrodynamic Lubrication (EHL)
Habchi, Wassim (author)
2018-05-14
57 pages
Article/Chapter (Book)
Electronic Resource
English
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