Results 261 to 270 of about 626,953 (312)

Oil film thickness using airborne laser-induced oil fluorescence backscatter

Applied Optics, 1983
Remote airborne measurement of oil film thickness on ocean surface using laser-induced water Raman backscatter is discussed. It is pointed out that the theoretical model of oil fluorescence by Horvath et al. (1971) contains the necessary constituents to provide for the natural background fluorescence that is also induced by the laser during the course ...
openaire   +2 more sources

Oil-Film Bearings

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 ...
openaire   +1 more source

Multiple-Image Oil Film Interferometry

46th AIAA Aerospace Sciences Meeting and Exhibit, 2008
The beneflts of using multiple oil-fllm interferograms to determine wall shear stress in ∞ows with spatially varying shear stress is considered. The data acquired when optical access to a test surface is available is described, and three methods for analyzing this data are presented: single-image analysis, dual-image analysis, and multiple image ...
openaire   +1 more source

Disjoining Pressure Isotherms for Oil−Water−Oil Emulsion Films

Langmuir, 1997
We have used a novel liquid surface forces apparatus (LSFA) to determine the variation of disjoining pressure with film thickness for dodecane−water−dodecane emulsion films. The LSFA allows measurement of film thicknesses in the range 5−100 nm and disjoining pressure from 0 to 1500 Pa. Disjoining pressure isotherms are given for films stabilized by the
B. P. Binks, W.-G. Cho, P. D. I. Fletcher   +2 more
openaire   +1 more source

Modeling of Oil-Film Forces in Squeeze-Film Bearings

Journal of Tribology, 1986
The 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, M. N. Sahinkaya, N. C. Kucuk   +2 more
openaire   +1 more source

Oil-Film Whirl—An Investigation of Disturbances Due to Oil Films in Journal Bearings

Journal of Fluids Engineering, 1956
Abstract 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
openaire   +1 more source

Breakdown of oil films and formation of residual films

Tribology International, 2008
The 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
openaire   +1 more source

Nanometric Thickness EHL Oil Films

Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology, 2006
EHD oil films possess a remnant thickness of 10–20 nm at very low speeds. This behavior was justified numerically using an empirical equation for wall viscosity. This paper uses molecule-wall interaction potential and finds that the viscosity decreases exponentially with the distance to the wall. A thin attached layer, responsible for remnant oil film,
openaire   +1 more source

Pressurized Oil Squeeze Film Dampers

Journal of Lubrication Technology, 1980
A pressurized oil squeeze film damper supporting a rigid rotor mounted in antifriction bearings is investigated. Orifice and inherent feed inlets are examined, and it is shown that the clearance determines the inlet resistance for a groove or slot. The film stiffness and damping forces are determined as a function of the restrictor coefficient, rotor ...
openaire   +1 more source

Mixed adsorbed films at oil-water interfaces

Journal of Colloid Science, 1948
Abstract Measurements have been made of the interfacial tensions of aqueous solutions of sodium dodecyl sulfate against solutions of octyl alcohol in benzene. By the application of the Gibbs adsorption theorem approximate calculations have been made of the surface excess of alcohol molecules and detergent molecules in the mixed adsorbed interfacial ...
openaire   +2 more sources