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    On the origins of lubricity and surface cleanliness in ethanol-diesel fuel blends

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    Name:
    JFUE-D-21-01710R2-Manuscript.pdf
    Size:
    1.646Mb
    Format:
    PDF
    Description:
    Accepted manuscript
    Embargo End Date:
    2023-06-04
    Download
    Type
    Article
    Authors
    Hong, Frank T. cc
    Singh, Eshan cc
    Sarathy, Mani cc
    KAUST Department
    Chemical Engineering Program
    Clean Combustion Research Center
    Combustion and Pyrolysis Chemistry (CPC) Group
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2021-06-04
    Online Publication Date
    2021-06-04
    Print Publication Date
    2021-10
    Embargo End Date
    2023-06-04
    Submitted Date
    2021-03-20
    Permanent link to this record
    http://hdl.handle.net/10754/669396
    
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    Abstract
    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.2021.121135
    Sponsors
    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 BV
    Journal
    Fuel
    DOI
    10.1016/j.fuel.2021.121135
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S0016236121010140
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.fuel.2021.121135
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Chemical Engineering Program; Mechanical Engineering Program; Clean Combustion Research Center

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