On the origins of lubricity and surface cleanliness in ethanol-diesel fuel blends
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ArticleAuthors
Hong, Frank T.
Singh, Eshan

Sarathy, Mani

KAUST Department
Chemical Engineering ProgramClean Combustion Research Center
Combustion and Pyrolysis Chemistry (CPC) Group
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2021-06-04Online Publication Date
2021-06-04Print Publication Date
2021-10Embargo End Date
2023-06-04Submitted Date
2021-03-20Permanent link to this record
http://hdl.handle.net/10754/669396
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Ethanol is the most used bio-derived fuel additive. However, adding ethanol in diesel fuel may negatively impact lubricity or surface cleanliness, which is critical for high-pressure fuel injection systems employed in compression ignition engines. This work investigates surfaces lubricated by ethanol–diesel blends. Adding 5 wt% ethanol in diesel showed negligible changes in fuel lubricity, while blending 10, 20, and 40 wt% ethanol increased wear rates by 46, 81, and 239% respectively. These increases in wear rates (with increases in ethanol by wt%) correlate with the evolution of electrical contact resistance (ECR) values over time. As more ethanol was added, the ECR values signaled thinner fuel films, more metal-to-metal contacts, and a delayed onset of frictional product growth. Raman spectra showed that forming frictional species produced by tribochemical reactions enhanced fuel lubricity. The absence of some frictional species in ethanol lubricated surfaces points to simultaneously improved surface cleanliness and reduced lubricity.Citation
Hong, F. T., Singh, E., & Sarathy, S. M. (2021). On the origins of lubricity and surface cleanliness in ethanol-diesel fuel blends. Fuel, 302, 121135. doi:10.1016/j.fuel.2021.121135Sponsors
The authors would like to acknowledge the fund allocated to this research by Saudi Aramco and King Abdullah University of Science and Technology (KAUST).Publisher
Elsevier BVJournal
FuelAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S0016236121010140ae974a485f413a2113503eed53cd6c53
10.1016/j.fuel.2021.121135