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Hydrodynamic Lubrication 2011 Part 2

Tham khảo tài liệu 'hydrodynamic lubrication 2011 part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 2.2 Reynolds Theory of Hydrodynamic Lubrication 11 insight into the problem. Actually in his second paper 2 Tower reported that the beautiful pressure distribution was observed as was expected. In the case of usual lubrication methods lubrication other than oil bath lubrication Tower reported that the measured value of friction was often unstable. Probably the quantity of oil was inadequate and a perfect oil film was not formed. In the case of the oil bath lubrication in contrast a sufficient amount of oil was presumably supplied. 2.2 Reynolds Theory of Hydrodynamic Lubrication Reynolds was interested in Tower s experiments and studied them theoretically. In the introductory part of his famous paper of 1886 3 on hydrodynamic lubrication Reynolds wrote Lubrication or the action of oils and other viscous fluids to diminish friction and wear between solid surfaces does not appear to have hitherto formed a subject for theoretical treatment. Such treatment may have been prevented by the obscurity of the physical actions involved which belong to a class as yet but little known namely the boundary or surface actions of fluids but the absence of such treatment has also been owing to the want of any general laws discovered by experiment. The subject is of such fundamental importance in practical mechanics and the opportunities for observation are so frequent that it may well be a matter of surprise that any general laws should have for so long escaped detection. On reading Mr. Tower s report it occurred to the author it is possible that in the case of the oil bath the film of oil might be sufficiently thick for the unknown boundary actions to disappear in which case the results would be deducible from the equations of hydrodynamics. Phenomena related to lubrication are generally speaking very complicated because of for example the complexity of interface phenomena and their theoretical treatments. In the case of oil bath lubrication however Reynolds assumed that the oil .