Heat transfer and tribological performance of graphene nanolubricant in an internal combustion engine. (November 2016)

• Record Type: Journal Article
• Authors: Rasheed, A.K.; Khalid, M.; Javeed, A.; Rashmi, W.; Gupta, T.C.S.M.; Chan, A.
• Is Part Of: Tribology international. Volume 103(2016)
• Page Start: 504
• Page End: 515
• Publication Date: 2016-11
• Subjects: Nanolubricants -- Graphene -- Thermal efficiency -- Nanotribology; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2016.08.007
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: In this work the performance of graphene based nanolubricant using a 4-stroke IC engine test rig is investigated. A nanolubricant is formulated using graphene nanoflakes and engine oil meeting API 20W50 SN/CF and API 20W50 SJ/CF specifications. The addition of 0.01 wt% graphene to API 20W50 SN/CF results in 23% enhancement in thermal conductivity ( k ) at 80 °C, and 21% reduction in the coefficient of friction ( µ ). Moreover, 70% enhancement in heat transfer rate of the engine is also achieved in the presence of graphene. SEM images of the piston rings collected after 100 h of engine operation show that the oil containing graphene (12 nm) decreases the piston wear compared to base oil without graphene. Highlights: 21%, 23%, 70% improvement in coefficient of friction (COF), thermal conductivity and heat transfer rate respectively. Multiply tribo-morphological phenomenon assisted COF enhancement. Graphene shape factor and liquid layering assisted thermal conductivity enhancement.