Cavitation induced starvation for piston-ring/liner tribological conjunction

Chong, William Woei Fong; Teodorescu, Mircea; Vaughan, N. D.

doi:10.1016/j.triboint.2010.12.008

Cited by 57 publications

(59 citation statements)

References 37 publications

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“…A solution can now be obtained for θ, h, p, δ, ρ and η, by representing equation (7) in finite differences and obtaining a solution through low relaxation effective influence Newton-Raphson method with Gauss-Seidel iterations (Al-Samieh and Rahnejat [1], Teodorescu et al [16] and Chong et al [20]). The procedure places the hemispherical feature at consecutive reducing separations h 0 from the surface of the flat semi-infinite plane.…”

Section: Methods Of Solutionmentioning

confidence: 99%

Effect of lubricant molecular rheology on formation and shear of ultra-thin surface films

Chong¹,

Teodorescu²,

Rahnejat³

2011

J. Phys. D: Appl. Phys.

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Abstract. Physics of molecularly thin fluid films, formed between surface features at close range is investigated. It is found that the interplay between discrete lubricant drainage from such contacts and localised contact deflection plays an important role both on the load carrying capacity of these asperity level conjunctions as well as on friction. Small spherical molecules tend to solvate near assumed smooth surfaces of asperities at nano-scale. Their discrete drainage at steadily decreasing gaps adds to the viscous friction of any bulk lubricant film. However, at the same time the generated solvation pressures increase the load carrying capacity. Conversely, long chain molecules tend to inhibit solvation, thus show a decrease in the load carrying capacity, whilst through their wetting action reduce friction. Consequently, real lubricants should comprise molecular species which promote desired contact characteristics, as indeed is the case for most base lubricants with surmised properties of certain additives. The methodology presented underpins the rather empirical implied action of surface adhered films. This is an initial approach which must be expanded to fluids with more complex mix of species. If applicable, this could also be an alternative (potentially time saving) approach to Monte-Carlo simulations for molecular dynamics.

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Section: Methods Of Solutionmentioning

confidence: 99%

Effect of lubricant molecular rheology on formation and shear of ultra-thin surface films

Chong¹,

Teodorescu²,

Rahnejat³

2011

J. Phys. D: Appl. Phys.

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“…Moreover, ( ) x  is the deflection induced by elastic deformation of the substrate. The calculation of ( ) x  can be obtained according to the previous works [13,14].…”

Section: Hydrodynamic Cavitation Modelmentioning

confidence: 99%

“…According to the work of Yang et al [29], these surface temperatures can be obtained by the following equations from (12)−(17). Equations (12), (14), and (17) are the heat transfer equations of the ring, the coating, and the liner, respectively. Equation (13) is the heat flux continuity condition on the interface between the ring and the coating.…”

Section: Thermal Modelmentioning

confidence: 99%

Analysis of the coated and textured ring/liner conjunction based on a thermal mixed lubrication model

Meng

Zhang

2017

Friction

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For the ring/liner conjunction, well-designed surface texturing has been regarded as a potential means to improve its tribological performance, as well as the application of coating. However, so far most researchers focused on the one of these aspects. In this study, the combined effect of coating and texturing on the performance of ring/liner conjunction is numerically investigated. A thermal mixed lubrication model is presented. The effects of the coating's thermal and mechanical properties on the tribological performance are studied under the cold and warm engine operating conditions. Along with the increasing coating thickness, the effects of the coating's thermal properties on friction loss are found to be significant, as well as the effects of the coating's mechanical properties. It is also found that a soft coating with a lower thermal inertia has a greater ability to reduce the friction loss of the textured conjunction.

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“…If this condition is applied to the JFO theory, then the result exactly matches the Swift-Stieber result. The JFO position is reported for a lowered cavity pressure for P cav = 0.02 MPa as used by Chong et al [36] as the model allows for lubricant film reformation. The other boundary conditions do not consider lubricant film reformation and therefore the physical interpretation of this is that the cavity is open and exposed to the ambient pressure.…”

Section: Comparison With Cavitation Modelsmentioning

confidence: 99%

Cavitation Bubble Measurement in Tribological Contacts Using Digital Holographic Microscopy

et al. 2015

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The use of advanced measurement techniques such as the digital holography method described in this paper improves the understanding of the cavitation phenomenon in tribological contacts such as the sliding contact of the piston ring-cylinder liner conjunction. The paper describes the use of digital holography measurement technique to measure cavitation bubble formation and thickness. The position of observed lubricant film rupture preceding the cavitation region is compared with some commonly predicted boundary often used with Reynolds equation. The experimental results indicate that the Reynolds and Elrod boundary conditions are the most suitable for the investigated sliding contact conditions.

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Cavitation induced starvation for piston-ring/liner tribological conjunction

Cited by 57 publications

References 37 publications

Effect of lubricant molecular rheology on formation and shear of ultra-thin surface films

Effect of lubricant molecular rheology on formation and shear of ultra-thin surface films

Analysis of the coated and textured ring/liner conjunction based on a thermal mixed lubrication model

Cavitation Bubble Measurement in Tribological Contacts Using Digital Holographic Microscopy

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