Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts

Shahmohamadi, Hamed; Rahmani, Ramin; Rahnejat, Homer; Garner, Colin P.; Balodimos, Nikolaos

doi:10.1016/j.triboint.2016.12.048

Cited by 34 publications

(26 citation statements)

References 29 publications

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“…The authors provide the data on an increase in the compressor efficiency ratio by 5.6 % and 5.3 %, respectively. The prospect of fullerene use in many technical fields is noted in research [13,14]. However, the presented papers do not pay attention to thin surface structures on friction surfaces and their role in reducing friction and wear.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of a rheological model of stress relaxation in the structure of an oil film on the friction surface with fullerene additives

Suska

Biekirov

Levkin

2021

EEJET

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A rheological model of stress relaxation in a thin lubricant film, which is formed on the friction surface under the influence of the force field of the friction surface in the presence of fullerene compositions in lubricants, was developed. Analysis of the model made it possible to establish that the existence of elastic or viscous properties in surface structures depends on the ratio of two parameters. This is the time of stress relaxation in the structure on spots of actual contact and the duration of stress action on these spots, which is termed the lifetime of an actual contact spot. It was shown that an increase in the sliding rate reduces the time of relaxation of stresses in the surface structure. This is due to the destruction of aggregates in the structure of gel and the appearance of rotational movements of separate units ‒ flocs. An increase in the load on the tribosystem significantly increases the value of relaxation time. This is due to squeezing the viscous component out of the structure of a surface film. It was established that if the relaxation time exceeds the duration of actions of stresses on actual contact spots, the structure of a surface film behaves like an elastic solid. Conversely, if relaxation time becomes shorter than the duration of stress action, the film behaves like a viscous medium. Theoretically, it was shown that in the range of sliding and loading rates, when a film behaves like an elastic solid, a decrease in stresses on actual contact spots does not exceed the values of 1.1‒22.8 %. This property provides the bearing capacity of a film. The development of the model will make it possible to simulate elastic and viscous properties of "stitched" structures and substantiate the rational concentrations of additives to lubricants, as well as the ranges of their use.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Development of a rheological model of stress relaxation in the structure of an oil film on the friction surface with fullerene additives

Suska

Biekirov

Levkin

2021

EEJET

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“…Furthermore, copper is an excellent conductor of heat, and hence, the as-prepared Cu nanoparticles, used as an additive in distilled water, are effective for improving the heat dissipation ability of the frictional contact area and avoiding local overheating [36][37][38][39], which is beneficial to improve the tribological properties. The cooling capacity is an important function of water-based lubricants, and the main factor that affects the cooling capacity of the lubricant is its thermal conductivity.…”

Section: Tribological Properties and Thermal Conductivity Of Water-somentioning

confidence: 99%

Synthesis of water-soluble Cu nanoparticles and evaluation of their tribological properties and thermal conductivity as a water-based additive

et al. 2018

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Efficient and sustainable use of water-based lubricants is essential for energy efficiency. Therefore, the use of water-lubricated mechanical systems instead of conventional oil lubricants is extremely attractive from the viewpoint of resource conservation. In this study, water-soluble Cu nanoparticles of size approximately 3 nm were prepared at room temperature (around 25 °C) via in-situ surface modification. The tribological behavior of the as-synthesized Cu nanoparticles as an additive in distilled water was evaluated using a universal micro-tribotester. The results show that the as-synthesized Cu nanoparticles, as a water-based lubricant additive, can significantly improve the tribological properties of distilled water. In particular, the lowest friction coefficient of 0.06 was obtained via lubrication with a concentration of 0.6 wt% of Cu nanoparticles in distilled water, which is a reduction of 80.6% compared with that obtained via lubrication with distilled water alone. It is considered that some Cu nanoparticles entered the contact area of the friction pairs to form a complex lubricating film and prevent direct contact of the friction pairs. Furthermore, some Cu nanoparticles in the solution accelerate the heat transfer process, which also results in good tribological properties.

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“…To date, a large number of nanomaterials used as additives to lubricating oils, in particular, carbon materials [23,24], carbon nanotubes [25], graphene oxide [26][27][28], boron nitrides [29,30], and silicon oxide [31], have been obtained. However, the most extensive studies have been carried out with metal-containing nanomaterials, whose NPs contain, e.g., metals, their oxides, and sulfides [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Metal-containing nanomaterials as lubricant additives: State-of-the-art and future development

2019

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This review focuses on the effect of metal-containing nanomaterials on tribological performance in oil lubrication. The basic data on nanolubricants based on nanoparticles of metals, metal oxides, metal sulfides, nanocomposities, and rare-earth compounds are generalized. The influence of nanoparticle size, morphology, surface functionalization, and concentration on friction and wear is analyzed. The lubrication mechanisms of nanolubricants are discussed. The problems and prospects for the development of metal-containing nanomaterials as lubricant additives are considered. The bibliography includes articles published during the last five years. Friction 7(2): 93-116 (2019) | https://mc03.manuscriptcentral.com/friction Friction 7(2): 93-116 (2019) 97 |www.Springer.com/journal/40544 | Friction http://friction.tsinghuajournals.comFriction 7(2): 93-116 (2019)

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Thermohydrodynamics of lubricant flow with carbon nanoparticles in tribological contacts

Abstract: This paper deals with the tribological performance of carbon nanoparticles dispersed in polyalphaolefin PAO6 oil. Stribeck curves are obtained under various operating conditions, using a fully instrumented pin-on-disc tribometer under controlled conditions. A detailed

Cited by 34 publications

References 29 publications

Development of a rheological model of stress relaxation in the structure of an oil film on the friction surface with fullerene additives

Development of a rheological model of stress relaxation in the structure of an oil film on the friction surface with fullerene additives

Synthesis of water-soluble Cu nanoparticles and evaluation of their tribological properties and thermal conductivity as a water-based additive

Metal-containing nanomaterials as lubricant additives: State-of-the-art and future development

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