Results 241 to 250 of about 11,520 (296)

Turbulent Lubrication Theory—Application to Design

Journal of Lubrication Technology, 1974
The purpose of this paper is to review the existing turbulent lubrication theories and their application to fluid film bearing design. The differences between and limitations of the alternative approaches are discussed. Design information is stressed rather than fluid mechanics fundamentals, but the basic concepts are dealt with in an appropriate ...
C. M. Taylor, D. Dowson
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Turbulent Lubrication Flow in an Annular Channel

Journal of Fluids Engineering, 1986
An analytical and experimental study is presented of the lubrication flow in an annular channel with a moving core. Velocity profiles and wall friction were determined over a Reynolds number range up to 3 × 104 and radius ratios of 0.6 and 0.85. The experimental results are shown to be in good agreement with the predictions of a three-layer gradient ...
H. G. Polderman, G. Velraeds, W. Knol
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Turbulent drag reduction by compliant lubricating layer

Journal of Fluid Mechanics, 2019
We propose a physically sound explanation for the drag reduction mechanism in a lubricated channel, a flow configuration in which an interface separates a thin layer of less-viscous fluid (viscosity $\unicode[STIX]{x1D702}_{1}$) from a main layer of a more-viscous fluid (viscosity $\unicode[STIX]{x1D702}_{2}$).
Alessio Roccon, Francesco Zonta, Alfredo Soldati   +2 more
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The Effect of Turbulence on Slider-Bearing Lubrication

Journal of Applied Mechanics, 1959
Abstract Based on Prandtl’s mixing-length mechanism, the pressure equation for turbulent flow in slider-bearing lubrication is derived. An analytical solution is given and compared with the one for laminar flow. It is found that the turbulent effect increases the pressure and, consequently, the load-carrying capacity.
Chou, Ye Tsang, Saibel, Edward
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Designing for turbulent lubrication

International Journal of Mechanical Sciences, 1973
Abstract There are three turbulent lubrication theories which lend themselves to convenient numerical solution of the governing Reynolds' equation. Two of the theories have been subjected to critical analysis in the literature, whilst the third due to Hirs is more recent. The theory of Hirs is considered from the standpoint of the designer.
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Thermohydrodynamic Lubrication in Laminar and Turbulent Regimes

Journal of Lubrication Technology, 1974
The distribution of “effective viscosity”—assumed dependent on local shear and temperature—is obtained via iteration between the “long bearing” momentum and energy equations. In this treatment the shaft is isothermal and the bearing conducts heat only in the radial direction.
Z. Safar, A. Z. Szeri
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Turbulent thermohydrodynamic lubrication models compared with measurements

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2004
The authors derived a three-dimensional turbulent thermohydrodynamic lubrication (THL) model (model A), based on the isothermal turbulent lubrication model developed in 1971 by Aoki and Harada. The Aoki-Harada theory is characterized by its modified definition of mixing length which enables its velocity profile in the lubricating oil film to agree ...
M Tanaka, K Hatakenaka
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On Turbulent Lubrication

Proceedings of the Institution of Mechanical Engineers, 1959
The paper concerns the hydrodynamic turbulent motion in the lubricant layer. Proceeding from the Reynolds equations and introducing the approximations currently used in lubrication problems, owing to the lubricant film thickness, the general motion equations for turbulent lubrication are written.
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Drag reduction in a lubricated turbulent channel

2021
Direct numerical simulation (DNS) was utilized to study the drag reduction in a lubricated channel, characterized by the injection of a lubricating fluid layer in the near wall region of a planar channel to favor the transportation of the core fluid. In the present work the fluids have equal density but different viscosity, allowing for the definition ...
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Effect of different turbulent lubrication models on the lubrication characteristics of water-lubricated rubber bearings at a high Reynolds number

Physics of Fluids, 2021
To study the lubrication characteristics of water-lubricated rubber bearings under high-Reynolds-number operating conditions, four different turbulent lubrication mathematical models are used. With these models, adopting the finite difference method, initially, the distributions of the Reynolds number, water film thickness, lining deformation, and film
Yuanying Du, Jianying Lan, Hui Quan, Chenxi Sun, Xiaoyi Liu, Xueling Yang   +5 more
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