Power Law Fluid Film Lubrication of Journal Bearing with Squeezing and Temperature Effects

2013 ◽  
pp. 73-84 ◽  
Author(s):  
Dhaneshwar Prasad ◽  
S. S. Panda ◽  
S. V. Subrahmanyam
Keyword(s):  
Power Law ◽  
Temperature Effects ◽  
Journal Bearing ◽  
Fluid Film ◽  
Power Law Fluid ◽  
Film Lubrication ◽  
Fluid Film Lubrication

Visualization of Oil Film on Journal Bearing from Axial Direction under Fluid Film Lubrication

2017 ◽  
Vol 2017.23 (0) ◽  
pp. 1909
Author(s):  
Bunji KURAMOTO ◽  
Yuta SUNAMI ◽  
Hiromu HASHIMOTO ◽  
Masayuki OCHIAI
Keyword(s):  
Journal Bearing ◽  
Axial Direction ◽  
Fluid Film ◽  
Oil Film ◽  
Film Lubrication ◽  
Fluid Film Lubrication

Nonuniform Temperature in Non-Newtonian Compressible Fluid Film Lubrication of Rollers

1988 ◽  
Vol 110 (4) ◽  
pp. 653-658 ◽  
Author(s):  
Dhaneshwar Prasad ◽  
Punyatma Singh ◽  
Prawal Sinha
Keyword(s):  
Power Law ◽  
Compressible Fluid ◽  
Fluid Film ◽  
Power Law Model ◽  
Pressure Peak ◽  
Energy Equations ◽  
Cylindrical Roller ◽  
Adiabatic Case ◽  
Film Lubrication ◽  
Fluid Film Lubrication

A theoretical analysis of heavily loaded rigid cylindrical roller bearings lubricated by a thin compressible fluid film, considering cavitation, is presented. The lubricating fluid is assumed to follow the non-Newtonian power law model and the consistency as well as density varies exponentially with pressure and temperature. The modified Reynolds and energy equations (adiabatic case) for a compressible power law fluid are obtained and are solved simultaneously. It is observed that the compressible fluid film pressure is comparatively higher than the incompressible one whereas this trend is reversed in case of temperature. Moreover, consistency and density variations, especially in the pressure peak region, are quite significant.

The Effect of Wavy Groove Liner on Pressure Distribution of Journal Bearing

2013 ◽  
Vol 315 ◽  
pp. 889-893
Author(s):  
Asral Asral ◽  
Jamaluddin Md Sheriff ◽  
Kahar Osman
Keyword(s):  
Pressure Distribution ◽  
Journal Bearing ◽  
Numerical Data ◽  
Fluid Film ◽  
Maximum Pressure ◽  
Cfd Analysis ◽  
Surface Waviness ◽  
Fluid Film Thickness ◽  
Film Lubrication ◽  
Fluid Film Lubrication

The ability of bearing liner to maintain the fluid film lubrication is crucial to its performance. This study is to investigate the pressure distribution for full film lubrication of wavy bearing liner. The results were compared to that from smooth bearing liner. These bearings were used with the palm oil based lubricant. CFD analysis was developed to determine the numerical data. A 60 mm bearing with ratio 0.5 of its diameter to length is simulated. This bearing has 250 µm in clearance and 200 µm in amplitude with semi rectangular circumferential surface waviness liner in shape. Pressure distribution of the bearing was influenced by the increment of the eccentricity ratio and the speed of shaft. The surface waviness liner bearing produces higher in pressure by comparing it with the smooth bearing. The maximum pressure was noted in the vicinity of minimum fluid film thickness where it was distributed at the area around the peak of wave.

scholarly journals Thermal Effects in Power-Law Fluid Film Lubrication of Rolling/Sliding Line Contact

2019 ◽  
Vol 8 (9) ◽  
pp. 277-283
Keyword(s):  
Power Law ◽  
Thermal Effects ◽  
Hydrodynamic Lubrication ◽  
Hydrodynamic Pressure ◽  
Line Contact ◽  
Power Law Fluid ◽  
Temperature Load ◽  
Film Lubrication ◽  
Good Agreement ◽  
Fluid Film Lubrication

Hydrodynamic lubrication of heavily loaded rigid system of non-symmetric roller bearings is studied to investigate the thermal effects in the operating behavior of line contact under isothermal and adiabatic boundaries. The incompressible power law lubricant is here considered and its consistency is taken to change with hydrodynamic pressure and the corresponding mean lubricant temperature. The flow controlling equations such as momentum, continuity and thermal energy are solved numerically using R-K Fehlberg method. The results obtained particularly, pressure, mean temperature, load and traction profiles are in good agreement with the previous findings.

Paper 3: Recent Developments in Fluid Film Lubrication Theory

1967 ◽  
Vol 182 (1) ◽  
pp. 36-50 ◽  
Author(s):  
T. Lloyd ◽  
H. McCallion
Keyword(s):  
Finite Difference ◽  
High Speed ◽  
Lubrication Theory ◽  
Fluid Film ◽  
Special Topic ◽  
Finite Difference Schemes ◽  
Great Activity ◽  
Wide Range ◽  
Film Lubrication ◽  
Fluid Film Lubrication

Developments in high-speed electronic computers have greatly influenced the progress in fluid film lubrication over the past ten years. Static and dynamic oil film parameters have been computed for a wide range of finite geometries, for hydrostatic and hydrodynamic bearings lubricated by compressible and incompressible lubricants. These are either sufficient in themselves or else act as a yardstick against which approximate formulas may be tested. Much use has been made of iterative finite difference schemes, which are particularly well suited to digital computers, and these methods are now more fully understood. Other methods of solution include direct inversion of finite difference matrices and solution by expression of the pressure by some infinite series, a finite number of terms of which give adequate representation. Besides the increase in design data available, there has been substantial progress through a re-examination of the effects of modifying some of the assumptions inherent in most of the available solutions of the Reynolds equation. These include the assumption of constant lubricant viscosity, of rigid surfaces and of laminar flow. Major progress has been witnessed in two fields. The interaction of the lubricant film with elastic boundaries has been shown to be of prime importance in highly loaded contacts such as gears. This has led to the development of the special topic of elastohydrodynamic lubrication theory. The applicability of gas bearings in such growing industries as computers, space vehicles and nuclear reactors has resulted in great activity and progress in this field.

The breakdown of fluid film lubrication in elastic-isoviscous point contacts

Wear ◽  
1980 ◽  
Vol 63 (1) ◽  
pp. 25-40 ◽  
Author(s):  
J.B. Medley ◽  
A.B. Strong ◽  
R.M. Pilliar ◽  
E.W. Wong
Keyword(s):  
Fluid Film ◽  
Point Contacts ◽  
Film Lubrication ◽  
Fluid Film Lubrication
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