Document Type : Original Article
Authors
1 Department of Physics- Faculty of Science- Shahid Chamran University of Ahvaz- Ahvaz- Iran
2 Department of Physics, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
Abstract
In this study, functionalized carbon nanotubes decorated with silver and copper nanoparticles (fCNTs-Ag, fCNTs-Cu) with mass ratios of 2% and 4% have been used to prepare ethylene glycol (EG) based nanofluids with different concentrations (0.1, 0.25 and 0.5 wt.%). The main goal of this research is the investigation of the effect of passing time on the thermal conductivity and stability of EG-based nanofluids. The thermal conductivity of samples was measured by a Decagon KD2 Pro thermal analyzer device for 90 days. The results showed that in all samples, the thermal conductivity of nanofluids was increased with increasing the concentration of nanoadditives. In addition, it was surprisingly observed that the thermal conductivity of samples was increased by passing time exponentially. The stability of the samples was investigated using UV-vis spectroscopy for 60 days. It was observed that the stability of nanofluids containing fCNTs-Cu is higher than the stability of nanofluids containing fCNTs-Ag.
Keywords
- thermal conductivity
- hybrid nanofluids
- stability
- UV-vis spectroscopy
- KD2 Pro thermal analyzer device
Main Subjects
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