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Comparative thermal analysis of an EG-based nanofluid containing DWCNTs

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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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  1. Department of Mechanical Engineering, Imam Hossein University, Tehran, Iran

    Mohammad Hemmat Esfe & Saeed Esfandeh

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  1. Mohammad Hemmat Esfe
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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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