期刊
ENERGY REPORTS
卷 7, 期 -, 页码 4222-4234出版社
ELSEVIER
DOI: 10.1016/j.egyr.2021.07.001
关键词
Functionalized-carbon dots; Ultra-stable nanofluid; Heat transfer; Thermo-physical properties; DFT
资金
- Iran Research Institute of Petroleum Industry (RIPI)
- European Union's Horizon 2020 Research and Innovation Program under the Marie Sklodowska-Curie grant [663830]
- Junta de Castilla y Leon, Spain [VA021G18]
- Ministerio de Ciencia e Innovacion of Spain [PID2019104924RBI00]
- University of Valladolid (GIR Nanostructure Physics), Spain
A facile hydrothermal method was used to synthesize functionalized carbon dot nanoparticles with oxygen and nitrogen functional groups. The resulting nanofluid exhibited stable zeta potential, enhanced thermal conductivity with increasing temperature and nanoparticle concentration, and improved convective heat transfer at higher Reynolds numbers. Density functional theory calculations highlighted the role of hydrogen bonds and electrostatic dipolar interactions in the stability of the nanofluid.
A facile hydrothermal method was applied to synthesize functionalized-carbon dot nanoparticles. The analysis revealed a low crystallinity with amorphous nature for particles with a size below 17 nm, which were functionalized with oxygen (17.9%) and nitrogen (12.2%). A nanofluid was formed by dispersing the nanoparticles in a mixture of water and ethylene glycol. The zeta potential measurement confirmed the stability of the nanofluid (-61.5 mV). Viscosity and density measurements revealed that the suspended nanoparticles did not noticeably increase the viscosity (maximum 8%) and density (maximum 1.2%). The thermal conductivity increased as temperature and nanoparticle concentration increased, and a maximum enhancement of 21% was obtained at 45 degrees C and 0.5 Wt%. Then, the convection heat transfer was investigated in the turbulent regime. The results showed a remarkable enhancement of the convective heat transfer coefficient (34%) at the Reynolds number of 15529 and 0.5 Wt%. Finally, the density functional theory (DFT) method was applied to interpret the longterm stability of the nanofluid. These results showed that the surface functional groups play a prominent role in the stability of the nanofluids. The calculations indicate that the bonding between the functionalized nanoparticles and the solvent fluid occurs through hydrogen bonds and electrostatic dipolar interactions. (C) 2021 The Authors. Published by Elsevier Ltd.
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