Results 271 to 280 of about 107,651 (313)
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Journal of the American Oil Chemists' Society, 1961
AbstractResults of studies of the effects of various factors on film yellowing, the mechanism of yellowing, its inhibition, and isolation and characterization of the yellow constituents are reported.Yellowing appears to be a side reaction unrelated to the drying process, but colorless precursors of the yellow compounds are formed as a result of an ...
O. S. Privett +3 more
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AbstractResults of studies of the effects of various factors on film yellowing, the mechanism of yellowing, its inhibition, and isolation and characterization of the yellow constituents are reported.Yellowing appears to be a side reaction unrelated to the drying process, but colorless precursors of the yellow compounds are formed as a result of an ...
O. S. Privett +3 more
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Oil-Film Whirl—An Investigation of Disturbances Due to Oil Films in Journal Bearings
Journal of Fluids Engineering, 1956Abstract With three rotors and five bearings, tests have been run with oil at various viscosities to determine conditions defining a range of stable operation with cylindrical journal bearings at speeds above twice critical speed. It is concluded that short bearings, rather large clearance ratios, and moderate unit bearing loads favor a ...
B. L. Newkirk, J. F. Lewis
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Films at oil-water interfaces. III
Journal of Colloid Science, 1948Abstract Experiments on the properties of films adsorbed at oil-water interfaces have been extended to include variation of the chain length of the adsorbed molecules, temperature, and the nature of the oil. In general, the evidence supports the hypothesis of an interfacial film in which the polar group is anchored at the interface and the ...
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Breakdown of oil films and formation of residual films
Tribology International, 2008The breakdown processes of oil films under quasi-static loading have been investigated by using a newly developed steel-oil-mercury system. The relationship between the thickness and breakdown ratio of a hexadecane film is represented by a single master curve independently of the indentation speed, indentation load, and temperature.
Kazuyoshi Manabe, Ken Nakano
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Photogrammetry in Oil-Film Interferometry
AIAA Journal, 2007Theapplication of photogrammetry to the measurement of skin friction using oil-film interferometry isdiscussed. Oil-film interferometry and photogrammetry are first described to justify the need for photogrammetry, and then the method is applied to two flows.
J. W. Naughton, T. Liu
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Journal of Fluids Engineering, 1939
Abstract A method is described for depositing very thin lubricating-oil films of any specified thickness of the order of 10−7 in. on polished metal in connection with experiments on boundary friction. The oil to be deposited is converted into a highly dispersed fog consisting largely of positively charged particles.
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Abstract A method is described for depositing very thin lubricating-oil films of any specified thickness of the order of 10−7 in. on polished metal in connection with experiments on boundary friction. The oil to be deposited is converted into a highly dispersed fog consisting largely of positively charged particles.
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1993
Most rotors are supported in oil-film bearings or in rolling-element bearings. For maintenance free operation and to give high speeds, gas and magnetic bearings are also increasingly being used. The bearings influence the rotor vibrations to a greater or less degree by their dynamic properties in comparison to those of the rotor and the remaining ...
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Most rotors are supported in oil-film bearings or in rolling-element bearings. For maintenance free operation and to give high speeds, gas and magnetic bearings are also increasingly being used. The bearings influence the rotor vibrations to a greater or less degree by their dynamic properties in comparison to those of the rotor and the remaining ...
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Characteristics of an Oil Squeeze Film
Journal of Lubrication Technology, 1982This paper presents both theoretically and experimentally determined characteristics of an oil squeeze film. In the experimental arrangement, an oil film was contained within two plane surfaces having only normal oscillatory relative motion. The effects of initial oil film thickness, peak to peak amplitude, and frequency of oscillation were measured. A
D. W. Parkins, W. T. Stanley
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Modeling of Oil-Film Forces in Squeeze-Film Bearings
Journal of Tribology, 1986The role played by bearings in determining the dynamic characteristics of rotor-bearing systems is well known. This has led to various attempts to model oil-film force coefficients in terms of linearized stiffness and damping elements. The inadequacy of these theoretical coefficients to predict performance under certain conditions has led some authors ...
C. R. Burrows +2 more
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