4.7 Article

Experimental investigations of particle sizes effects on exergy and entropy characteristics of AL2O3 - MWCNT hybrid nanofluid along the transitional flow regime

Journal

CASE STUDIES IN THERMAL ENGINEERING
Volume 51, Issue -, Pages -

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ELSEVIER
DOI: 10.1016/j.csite.2023.103575

Keywords

Thermal entropy; Frictional entropy; Hybrid nanofluids; Transitional regime; Heat transfer

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The experimental investigation focused on the effects of particle size on the entropy and exergy characteristics of AL(2)O(3)-MWCNT hybrid nanofluid in transitional flow regime. The results showed that the nanofluid with Al2O3 (20 nm) and MWCNT (<7 nm) exhibited the best performance, with reduced frictional and thermal entropy.
Experimental investigation on particle size effect on entropy and exergy characteristics of AL(2)O(3) - MWCNT hybrid nanofluid in transitional flow Regime was carried out with four different particle sizes (i.e., for Aluminum oxide (AL(2)O(3)), 20 nm, and 5 nm used while Multiwalled Carbon Nanotubes (MWCNT) <7 nm and 30-50 nm particles). 0.3 vol concentrations of three hybrid nanofluids with different particle size combinations (i.e., Al2O3(20 nm) - MWCNT(20-30 nm), Al2O3(20 nm) - MWCNT(<7 nm), and then Al2O3(5 nm) - MWCNT(<7 nm)) are prepared using a two-step method, at a percentage weight composition (PWC) of 60:40. Results shows that Nanofluid with Al2O3 (20 nm) and MWCNT (<7 nm) have shown the best performance. It has an exergy efficiency of 54.12% at turbulent Reynold number of 4500, while in the transitional flow regime, it records an exergy efficiency of 47.85%. Frictional entropy and thermal entropy in the transitional regime were reduced with hybrid nanofluid of Al2O3 (20 nm) and MWCNT (<7 nm) by 6.78% and 13.53%, respectively, as compared to Al2O3 (5)- MWCNT (<7) nanofluid. Both thermal and frictional entropy effects were better minimized in the turbulent regime than in the lamina and transitional regime, as they were reduced by 16.66 and 24.7%, respectively. The study also recommends that for further investigations, more samples need to be taken to reach a clearer conclusion the effect of particle size, and since this is a hybrid nanofluid the samples should be of different sizes from both nanoparticles.

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