Abstract
Non-dimensional groups which have been adopted in presenting EHL results are reviewed. It is shown that when the Roelands [1] viscosity-pressure relationship is adopted, the most popular set of the groups ( G, U, W ) do not determine the solution uniquely. Therefore, it is suggested that the selection of lubricant properties and the definition of ( G ) be standardized. It is also concluded that two additional non-dimensional groups are needed for the unique representation of EHL operational conditions. For example, for circular or line contact problems. ( Z ) can be replaced by ( G ). Buckingham's II-theorem confirms this in terms of the maximum number of separate independent non-dimensional groups of the system.
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