A study of thermal effects in EHL rheology and friction using infrared microscopy

Lu, Jianjiang; Reddyhoff, Tom; Dini, Daniele

doi:10.1016/j.triboint.2020.106179

Cited by 3 publications

(1 citation statement)

References 64 publications

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“…The effect of the surface properties can also be important in determining flow under EHL conditions [113]. Ewen et al [98] performed NEMD simulations to study the friction and flow of Santotrac 2000 and hydrogenated 1-decene trimer between surfaces with different thermal conductivities.…”

Section: Flow and Phase Behaviourmentioning

confidence: 99%

Contributions of Molecular Dynamics Simulations to Elastohydrodynamic Lubrication

2021

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The prediction of friction under elastohydrodynamic lubrication (EHL) conditions remains one of the most important and controversial areas of tribology. This is mostly because the pressure and shear rate conditions inside EHL contacts are particularly severe, which complicates experimental design. Over the last decade, molecular dynamics (MD) simulation has played an increasingly significant role in our fundamental understanding of molecular behaviour under EHL conditions. In recent years, MD simulation has shown quantitative agreement with friction and viscosity results obtained experimentally, meaning that they can, either in isolation or through the use of multiscale coupling methods, begin to be used to test and inform macroscale models for EHL problems. This is particularly useful under conditions that are relevant inside machine components, but are difficult to obtain experimentally without uncontrollable shear heating.

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Section: Flow and Phase Behaviourmentioning

confidence: 99%

Contributions of Molecular Dynamics Simulations to Elastohydrodynamic Lubrication

2021

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Advanced modelling of lubricated interfaces in general curvilinear grids

Ardah

Profito

Reddyhoff

et al. 2023

Tribology International

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Effects of Oil and Solid Body Temperatures on Elastohydrodynamic Lubrication Film Formation

Gao,

Yang,

et al. 2024

Lubricants

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The present study focuses on investigating the influence of oil and solid body temperatures on elastohydrodynamic lubrication (EHL) film formation. Experimental and numerical simulation methods are employed to examine three heating methods: oil and ball heating, disc heating, and entire system heating. A preliminary comparison between the measured results and numerical simulations confirms the impact of heating methods on film formation while validating the availability of the numerical models. Further numerical analysis reveals that in the case of oil and ball heating, the temperature gradient induced by differences in solid body temperatures plays a more significant role in film formation compared to the conventional thermal-viscosity wedge effect caused by EHL film shear. This effect is further amplified at large sliding–rolling ratios and in steel–steel contacts. The overall film formation is primarily governed by the oil inlet temperature, whereas local film formation characterized by a dimple shape is influenced by both thermal gradient effects and thermal-viscosity wedge effects. This study provides valuable insights for selecting appropriate heating methods in experiments as well as understanding how temperature differences affect film formation in practical engineering.

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A study of thermal effects in EHL rheology and friction using infrared microscopy

Cited by 3 publications

References 64 publications

Contributions of Molecular Dynamics Simulations to Elastohydrodynamic Lubrication

Contributions of Molecular Dynamics Simulations to Elastohydrodynamic Lubrication

Advanced modelling of lubricated interfaces in general curvilinear grids

Effects of Oil and Solid Body Temperatures on Elastohydrodynamic Lubrication Film Formation

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