Abstract
The thermal conductivity (TC) of DWCNT/EG nanofluid at the temperature range of 30–50 °C and solid volume fraction (SVF) range of 0.055–0.92% was investigated. The results showed that the enhancement of SVF at 50 °C increases TC up to 35.37%. Experimental data obtained for this nanofluid were compared with experimental results of SWCNT/EG, DWCNT–ZnO/EG–water (40:60), MWCNT–ZnO (50:50)/EG–water (50:50) and SWCNT–ZnO (30:70)/EG–water (60:40). Using experimental data, a correlation was proposed for the prediction of TC with R2 (regression coefficient) and maximum correlation error of 0.993687% and 2%, respectively. Nanofluid sensitivity analysis showed that in higher SVFs, the increment of sensitivity relative to temperature is higher than in lower SVFs.
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Abbreviations
- K nf :
-
Thermal conductivity of nanofluid
- K f :
-
Thermal conductivity of base fluid
- R2 :
-
Regression coefficient
- T:
-
Temperature
- BET:
-
Brunauer–Emmett–Teller
- EG:
-
Ethylene glycol
- EXP:
-
Experimental
- MOD:
-
Margin of deviation
- DWCNT:
-
Double-walled carbon nanotube
- HT:
-
Heat transfer
- MWCNT:
-
Multi-walled carbon nanotube
- Pred:
-
Predicted
- SWCNT:
-
Single-walled carbon nanotube
- SVF:
-
Solid volume fraction
- SSA:
-
Specific surface area
- TEM:
-
Transmission electron microscopy
- PPF:
-
Price performance factor
- TC:
-
Thermal conductivity
- TCE:
-
Thermal conductivity enhancement
- TCR:
-
Thermal conductivity ratio
- TGA:
-
Thermogravimetric analysis
- φ:
-
Solid volume fraction (%)
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Hemmat Esfe, M., Esfandeh, S. Comparative thermal analysis of an EG-based nanofluid containing DWCNTs. Eur. Phys. J. Plus 136, 469 (2021). https://doi.org/10.1140/epjp/s13360-021-01412-0
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DOI: https://doi.org/10.1140/epjp/s13360-021-01412-0