What trends or patterns can be identified, especially with regards to the validity limitation of the Petroff Equation?

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Serge V. Shil’ko

Petroff Equation is good validated for constant values of two important parameters, namely, the gap in bearing and viscosity of lubricant. When these conditions are satisfied, the calculated friction coefficient agrees with experimental one. Best regards

Enrico Manfredi

I suggest you to read the following book R. Bassani, Tribology, Pisa University Press, 2013, 608 pages, ISBN 9788867411740, where experimental data are also given.