Results 211 to 220 of about 618 (258)

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 very
M Tanaka, K Hatakenaka
exaly   +2 more sources

Stochastic models for turbulent lubrication of bearing with rough surfaces

Tribology International, 2019
Abstract Currently used turbulent lubrication model that considers the effects of surface roughness can only handle the isotropic rough surfaces and cannot handle the rough surfaces with directional properties. In this paper, based on the stochastic method and the Ng-Pan turbulent model, the stochastic turbulent lubrication models of one-dimensional ...
Jun Sun, Shaoyu Zhu, Guixiang Zhu
exaly   +2 more sources

The homogenization method of roughness analysis in turbulent lubrication

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 2013
The hydrodynamic lubrication theory founded by Osborne Reynolds in 1886 is based on several assumptions, including that the contact surfaces are perfectly smooth, and the lubricant flow regime is laminar. However, in certain special cases these hypotheses may not be valid, and it is seen that surface roughness and turbulence affect bearing performance.
Benyebka Bou-Saïd, John Tichý, Mustapha Lahmar   +2 more
exaly   +2 more sources

A Theory of Lubrication With Turbulent Flow and Its Application to Slider Bearings

Journal of Applied Mechanics, Transactions ASME, 1960
The governing equation of turbulent lubrication in three dimensions, equivalent to the Reynolds equation of laminar lubrication, is derived. The problem of a slider bearing with no side leakage is then analyzed. An exact solution is found in closed form. Bearing characteristics are also established.
Tao L N
exaly   +3 more sources

Turbulence models of hydrodynamic lubrication

Journal of Shanghai University (English Edition), 2003
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Zhang, Zhiming, Wang, Xiaojing, Sun, Meili   +2 more
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +1 more source

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.
openaire   +1 more source

On the Determination of Friction Forces in Turbulent Lubrication

A S L E Transactions, 1965
The mixing length theory, used previously for the determination of the velocity profiles and pressure distributions in turbulent films is now employed in order to determine the friction stresses To, Th on the two lubricated surfaces and their dependence on the Reynolds number and on the pressure distribution. Thus, it results that the curves τo(Bxτ and
V. N. Constantinescu, S. Galetuse
openaire   +1 more source

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
openaire   +1 more source