Ignition Delay and Burning Rate Analysis of Diesel–Carbon Nanotube Blends Stabilized by a Surfactant: A Droplet-Scale Study

Anderson Gallego (), Karen Cacua, David Gamboa, Jorge Rentería and Bernardo Herrera
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Anderson Gallego: Advanced Materials and Energy Group (MATyER), Instituto Tecnológico Metropolitano, Street 54A No 30-01, Medellín 050536, Colombia
Karen Cacua: Advanced Materials and Energy Group (MATyER), Instituto Tecnológico Metropolitano, Street 54A No 30-01, Medellín 050536, Colombia
David Gamboa: Advanced Materials and Energy Group (MATyER), Instituto Tecnológico Metropolitano, Street 54A No 30-01, Medellín 050536, Colombia
Jorge Rentería: Advanced Materials and Energy Group (MATyER), Instituto Tecnológico Metropolitano, Street 54A No 30-01, Medellín 050536, Colombia
Bernardo Herrera: Advanced Materials and Energy Group (MATyER), Instituto Tecnológico Metropolitano, Street 54A No 30-01, Medellín 050536, Colombia

Energies, 2023, vol. 16, issue 23, 1-22

Abstract: In this study, the effects of pristine carbon nanotubes (CNTs), sodium dodecylbenzene sulfonate (SDBS), and diesel blends on the ignition delay and burning rate are examined experimentally. For this purpose, single-droplet combustion tests were conducted in a combustion system for 21 days using CNTs at concentrations of 50 ppm and 100 ppm, which were dispersed in Colombian commercial diesel and stabilized by SDBS. Videos of the diesel droplet burning were obtained using a high-speed camera, and the Shadowgraph optical technique was used to observe the development of the droplet size during combustion. Thus, records of the process were collected, and the treatment was carried out using a MATLAB algorithm. The measurements and processing were carried out along with a stability study, which included measurements of dynamic light scattering (DLS), pH, potential Zeta, and properties such as thermal conductivity and surface tension. The results demonstrated that the temporal stability has a direct impact on the single-droplet combustion tests because a concentration of CNTs of 100 ppm showed a higher stability than those achieved by 50 ppm. Consequently, improvements were found with a concentration of 100 ppm—for instance, the thermal conductivity increased by about 20%, the ignition delay time increased by 16.2%, and the burning rate increased by 30.5%.

Keywords: ignition delay; burning rate; carbon nanotubes; commercial diesel; sodium dodecylbenzene sulfonate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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