Results 191 to 200 of about 22,943 (238)

Quantum-Scale Friction at Solid-Liquid Interface: Simulation, Detection Techniques, Mechanisms, and Emerging Applications. [PDF]

Nanomicro Lett
Han Y, Zhang R, Liu D, Luo J.
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Hydrodynamic Lubrication

Scientific Lubrication, 1957
The breakdown of laminar flow in the clearance space of a journal is considered, and the point of transition is considered in relation to experiments carried out with ‘bearings’ of large clearance. Experiments involving flow visualization with very large clearance ratios of 0.05 to 0.3 show that the laminar regime gives way to cellular or ring vertices
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Hydrodynamic lubrication of threads

Wear, 1982
Abstract Two analytical solutions are derived for the hydrodynamic lubrication of threads. Numerical solution confirms their validity and bridges the gap between the two analytical solutions. The limits of validity of the solutions are discussed in the light of neglected effects which require further consideration.
A. Magnin, J.-M. Piau
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Approximations in Hydrodynamic Lubrication

Journal of Tribology, 1992
In this numerical study of the approximations that led Reynolds to the formulation of classical Lubrication Theory, we compare results from (1) the full Navier-Stokes equations, (2) a lubrication theory relative to the “natural,” i.e., bipolar, coordinate system of the geometry that neglects fluid inertia, and (3) the classical Reynolds Lubrication ...
R. X. Dai, Q. Dong, A. Z. Szeri
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Boundary and hydrodynamic lubrication

Wear, 1990
Abstract Models of typical characteristics of the surfaces of two interfacing solids under pressure and sliding against each other are described. In the first model, the asperities, wedges of the harder surface, indent into the softer surface due to the applied pressure, producing opposing ridges on the surface of the softer component.
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Hydrodynamic Lubrication of ‘Perspex’

Nature, 1962
IN recent experimental investigations of the lubrication at heavily stressed contacts, particular attention has been paid to measurements of the thickness of the lubricant film which, between gear teeth, is typically about 1µ. Using steel cylinders nominally in line or point contact the thickness of the film has been deduced from measurements of ...
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Transition from Boundary Lubrication to Hydrodynamic Lubrication of Slider Bearings

IBM Journal of Research and Development, 1974
The transition from boundary lubrication to fully hydrodynamic lubrication is investigated for air-lubricated slider bearings using the electrical resistance method. Intermittent contacts are shown to exist even under conditions for which the numerical solution of the Reynolds equation or white light interferometry predicts steady state spacings in the
Raymond C. Tseng, Frank E. Talke
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On the transition from boundary lubrication to hydrodynamic lubrication in soft contacts

Journal of Physics: Condensed Matter, 2009
We consider the contact between elastically soft solids with randomly rough surfaces in sliding contact in a fluid, which is assumed to be Newtonian with constant (pressure-independent) viscosity. We discuss the nature of the transition from boundary lubrication at low sliding velocity, where direct solid-solid contact occurs, to hydrodynamic ...
B N J, Persson, M, Scaraggi
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Hydrodynamic lubrication

Resonance, 1996
Jaywant H. Arakeri, K. R. Sreenivas
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