Film building in circular EHL contact lubricated by oil droplet groups

2018 ◽  
Vol 30 (4) ◽  
pp. 149-159 ◽  
Author(s):  
Feng Guo ◽  
Shu-Yi Li ◽  
Cheng-Long Liu ◽  
Xin-Ming Li ◽  
Xiao-Ling Liu
Keyword(s):  
Oil Droplet ◽  
Ehl Contact

Numerical simulation of an oil droplet passing through an EHL contact

2017 ◽  
Vol 112 ◽  
pp. 58-67 ◽  
Author(s):  
S.Y. Li ◽  
F. Guo ◽  
X.M. Li ◽  
C.L. Liu
Keyword(s):  
Numerical Simulation ◽  
Oil Droplet ◽  
Ehl Contact

scholarly journals Behaviors of a micro oil droplet in an EHL contact

Friction ◽  
2016 ◽  
Vol 4 (4) ◽  
pp. 359-368 ◽  
Author(s):  
Xinming Li ◽  
Feng Guo ◽  
Shaopeng Wang ◽  
Chenglong Liu ◽  
Wenzhong Wang
Keyword(s):  
Oil Droplet ◽  
Ehl Contact

scholarly journals Effect of storage on the rheological and viscoelastic properties of mayonnaise emulsions of different oil droplet size

Heliyon ◽  
2020 ◽  
Vol 6 (12) ◽  
pp. e05788
Author(s):  
George Katsaros ◽  
Magdalini Tsoukala ◽  
Marianna Giannoglou ◽  
Petros Taoukis
Keyword(s):  
Droplet Size ◽  
Viscoelastic Properties ◽  
Oil Droplet ◽  
Oil Droplet Size

Effects of Surface Micro-Geometry On the Lift-Off Speed of an EHL Contact

2002 ◽  
Vol 45 (1) ◽  
pp. 21-30 ◽  
Author(s):  
M. A. Masen ◽  
C. H. Venner ◽  
P. M. Lugt ◽  
J. H. Tripp
Keyword(s):  
Lift Off ◽  
Ehl Contact

scholarly journals Superoleophobic Surfaces: Reversible Underwater Lossless Oil Droplet Transportation (Adv. Mater. Interfaces 2/2015)

2015 ◽  
Vol 2 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jiale Yong ◽  
Qing Yang ◽  
Feng Chen ◽  
Hao Bian ◽  
Guangqing Du ◽  
...  
Keyword(s):  
Oil Droplet

scholarly journals Feasibility Study on Oil Droplet Flow Investigations Inside Aero Engine Bearing Chambers: PDPA Techniques in Combination With Numerical Approaches

1995 ◽  
Author(s):  
A. Glahn ◽  
M. Kurreck ◽  
M. Willmann ◽  
S. Wittig
Keyword(s):  
Numerical Methods ◽  
Flow Field ◽  
Flow Analysis ◽  
Field Analysis ◽  
Oil Droplet ◽  
Droplet Flow ◽  
Aero Engine ◽  
Secondary Air ◽  
Numerical Approaches ◽  
Engine Bearing

The present paper deals with oil droplet now phenomena in aero engine bearing chambers. An experimental investigation of droplet sizes and velocities utilizing a Phase Doppler Particle Analyzer (PDPA) has been performed for the first time in bearing chamber atmospheres under real engine conditions. Influences of high rotational speeds are discussed for individual droplet size classes. Although this is an important contribution to a better understanding of the droplet flow impact on secondary air/oil system performance, an analysis of the droplet flow behaviour requires an incorporation of numerical methods because detailed measurements as performed here suffer from both strong spatial limitations with respect to the optical accessibility in real engine applications and constraints due to the extremely time consuming nature of an experimental flow field analysis. Therefore, further analysis is based on numerical methods. Droplets characterized within the experiments are exposed to the flow field of the gaseous phase predicted by use of our well-known CFD code EPOS. The droplet trajectories and velocities are calculated within a Lagrangian frame of reference by forward numerical integration of the particle momentum equation. This paper has been initiated rather to show a successful method of bearing chamber droplet flow analysis by a combination of droplet sizing techniques and numerical approaches than to present field values as a function of all operating parameters. However, a first insight into the complex droplet flow phenomena is given and specific problems in bearing chamber heat transfer are related to the droplet flow.

Dynamics of a Water Droplet over a Sessile Oil Droplet: Compound Droplets Satisfying a Neumann Condition

Langmuir ◽  
2017 ◽  
Vol 33 (23) ◽  
pp. 5713-5723 ◽  
Author(s):  
R. Iqbal ◽  
S. Dhiman ◽  
A. K. Sen ◽  
Amy Q. Shen
Keyword(s):  
Water Droplet ◽  
Neumann Condition ◽  
Oil Droplet

scholarly journals Analytical Formula for the Ratio of Central to Minimum Film Thickness in a Circular EHL Contact

Lubricants ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 80 ◽  
Author(s):  
Petr Sperka ◽  
Ivan Krupka ◽  
Martin Hartl
Keyword(s):  
Experimental Data ◽  
Film Thickness ◽  
Analytical Formula ◽  
Numerical Calculations ◽  
Constant Ratio ◽  
Viscosity Coefficients ◽  
Wide Range ◽  
Minimum Film Thickness ◽  
Film Parameter ◽  
Ehl Contact

Prediction of minimum film thickness is often used in practice for calculation of film parameter to design machine operation in full film regime. It was reported several times that majority of prediction formulas cannot match experimental data in terms of minimum film thickness. These standard prediction formulas give almost constant ratio between central and minimum film thickness while numerical calculations show ratio which spans from 1 to more than 3 depending on M and L parameters. In this paper, an analytical formula of this ratio is presented for lubricants with various pressure–viscosity coefficients. The analytical formula is compared with optical interferometry measurements and differences are discussed. It allows better prediction, compared to standard formulas, of minimum film thickness for wide range of M and L parameters.

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