scholarly journals Numerical simulation of deformation and rupture process of bubble in an oil film impacted by an oil droplet

2018 ◽  
Vol 67 (11) ◽  
pp. 114701
Author(s):  
Zhou Jian-Hong ◽  
Tong Bao-Hong ◽  
Wang Wei ◽  
Su Jia-Lei
Keyword(s):  
Numerical Simulation ◽  
Rupture Process ◽  
Oil Droplet ◽  
Oil Film

Numerical Simulation of Oil-Droplet Cleavage by Surfactant

1996 ◽  
Vol 118 (2) ◽  
pp. 201-209 ◽  
Author(s):  
Xiaoyi He ◽  
Micah Dembo
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Surface Tension ◽  
Large Deformation ◽  
Concentration Gradient ◽  
Surface Tension Gradient ◽  
Oil Droplets ◽  
Numerical Computations ◽  
Oil Droplet ◽  
Pure Surface

We present numerical computations of the deformation of an oil-droplet under the influence of a surface tension gradient generated by the surfactant released at the poles (the Greenspan experiment). We find this deformation to be very small under the pure surface tension gradient. To explain the large deformation of oil droplets observed in Greenspan’s experiments, we propose the existence of a phoretic force generated by the concentration gradient of the surfactant. We show that this hypothesis successfully explains the available experimental data and we propose some further tests.

Numerical Simulation and Evaluation of the Oil Film Flow Field in Hydro-Viscous Drive

2013 ◽  
Vol 7 (1) ◽  
pp. 764-771
Author(s):  
Gang Zheng ◽  
Fangwei Xie ◽  
Xialong Li ◽  
Jian Liu ◽  
Jianzhong Cui ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Film Flow ◽  
Oil Film ◽  
Simulation And Evaluation

Oil-Film Starvation in Elastohydrodynamic Circular Contacts

1977 ◽  
Vol 19 (1) ◽  
pp. 22-29 ◽  
Author(s):  
A. Vakilzadeh ◽  
R. Gohar
Keyword(s):  
Film Thickness ◽  
Contact Region ◽  
Oil Droplet ◽  
Oil Film ◽  
Circular Contact

A formula for the oil-film thickness in a starved, elastohydrodynamic, circular contact is presented in terms of external parameters. Experiments are described which confirm the theory. Also examined are the oil droplet around the contact region, and the track shape made by the passage of the balls on the races.

Numerical Simulation of Oil-Film Formation under Reciprocating Rolling Point Contact

2004 ◽  
Vol 2004.57 (0) ◽  
pp. 339-340
Author(s):  
Teruaki KAWASAKI ◽  
Naoshi IZUMI ◽  
Kazunori ICHIMARU ◽  
Kazuki TAKENOUCHI ◽  
Takehiro MORITA
Keyword(s):  
Numerical Simulation ◽  
Film Formation ◽  
Point Contact ◽  
Oil Film

Numerical Simulation on Oil-Flow-State of Gap Oil Film in Sector Cavity Multi-Pad Hydrostatic Thrust Bearing

2010 ◽  
Vol 37-38 ◽  
pp. 743-747
Author(s):  
Xiao Dong Yu ◽  
Xiu Li Meng ◽  
Hui Jiang ◽  
Xiao Zhong Lou ◽  
Bo Wu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Laminar Flow ◽  
Critical Speed ◽  
Thrust Bearing ◽  
Lubricating Oil ◽  
Good Effect ◽  
Critical Flow ◽  
Flow State ◽  
Oil Film ◽  
Oil Flow

Hydrostatic thrust bearing lubrication is significantly affected by the oil flow state of gap oil film, but it can not be measured by experiment and analysis. For this problem, the oil flow state of gap oil film in sector cavity multi-pad hydrostatic thrust bearing during rotation was simulated by using computational fluid dynamics, lubricating theory, and Finite Element Method. Laminar model and κ-ε turbulence model were adopted to model incompressible steady equations, and the equations were discreted by using Finite Volume Method and Second-order Finite Difference. By comparing the calculated results of numerical simulation and semi-empirical theoretical equation, the numerical simulation is proved feasible in oil film state analysis parameter prediction, which can overcome the deficiency of single model and get good effect. Streamlines and velocity vectors show that the lubricating oil flow in the resistive oil edges and oil cavities are laminar flow under the conditions of speed and flow in less than a certain value, while the flow and speed are more than a certain value, the lubricating oil flow in the resistive oil edges is also laminar flow, but the lubricating oil flow in the oil cavities is turbulent flow, then determines critical flow and critical speed. The critical flow and critical speed were determined, it provides a theoretical basis of the temperature field and thermal field deformation calculation.

Numerical Simulation on the Lubrication Performance of Surface Textured Piston Rings

2011 ◽  
Vol 199-200 ◽  
pp. 734-738 ◽  
Author(s):  
Qiu Ying Chang ◽  
Xian Liang Zheng ◽  
Qing Liu
Keyword(s):  
Numerical Simulation ◽  
Film Thickness ◽  
Friction Force ◽  
Friction And Wear ◽  
Piston Ring ◽  
Hydrodynamic Lubrication ◽  
Cylinder Liner ◽  
Area Density ◽  
Oil Film ◽  
Lubrication Performance

Surface texturing has been successfully employed in some tribological applications in order to diminish friction and wear. This technology may be used in a piston ring to decrease the friction and wear of the contact between a piston ring and cylinder liner. A numerical simulation of lubrication between a surface textured piston ring and cylinder liner based on the hydrodynamic lubrication theory was conducted. The influence of surface texture parameters on piston ring lubrication performance was obtained by solving the mathematical equations with a multi-grid method. The results show that under the micro-dimple area density of 5%-40% the minimum oil film thickness increases and the dimensionless friction force decreases with the increasing of it. Under the dimple area density of 40%-60%, the minimum oil film thickness and the dimensionless friction force change slightly. Under various dimple area densities the optimum dimple depth at the given working condition in this paper is about 5µm.

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
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