Effects of Surface Modification, Temperature, and Mass Fraction on Thermal Properties of Nano-graphite/Water Nano-fluid
| Authors | B. Pratap1, G. Sahu2, S.P. Mahapatra1 |
| Affiliations |
1Department of Chemistry, National Institute of Technology, 492010 Raipur, Chhattisgarh, India 2Department of Mechanical Engineering, Government Engineering College, 492015 Raipur, Chhattisgarh, India |
| Е-mail | |
| Issue | Volume 16, Year 2024, Number 6 |
| Dates | Received 27 August 2024; revised manuscript received 16 December 2024; published online 23 December 2024 |
| Citation | B. Pratap, G. Sahu, S.P. Mahapatra, J. Nano- Electron. Phys. 16 No 6, 06010 (2024) |
| DOI | https://doi.org/10.21272/jnep.16(6).06010 |
| PACS Number(s) | 65.60. + a, 81.05.Gc, 81.05.uf |
| Keywords | Synthesis (27) , Nano-graphite, Surface modification (3) , Nano-fluids, Thermal properties (2) . |
| Annotation |
Nano-graphite (NG) and acid modified nano-graphite (ANG) nanoparticles were synthesized from graphite powder using a strong acid i.e. a mixture (sulphuric acid and nitric acid). The optical study and stability of NG and ANG/water nano-fluids were determined by using Ultraviolet-visible spectroscopy measurement. The thermal properties including thermal conductivity, thermal diffusivity and volumetric heat capacity of the nano-fluids were measured in the mass fraction range 0 – 0.053 wt% and at temperature range of 20 – 80°C. The thermal conductivity and thermal diffusivity of the nano-fluids show considerable rise, whereas volumetric heat capacity reduced with NG and ANG concentrations. The thermal conductivity improvement of the nano-fluid shows a considerable rise, with maximal increases of 67.64% and 75.97% for 0.053 wt% NG and ANG loadings, respectively. The volumetric heat capacity of the nano-fluids reductions with rise in mass fraction of NG and ANG and increases with increase in temperature. As a result, ANG nanoparticles are more effective at raising the thermal conductivity of water-based nanofluids, then the NG particles at given the above mass fraction loadings. Finally, based on the findings, in terms of thermal characteristics in practical systems, nano-fluids can be determined to be a viable alternative to water-based fluids. |
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List of References |
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