Numerical investigation of thermal performances of hybrid nanofluids in solar collectors implementing polygonal rough surfaces

Numerical investigation of thermal performances of hybrid nanofluids in solar collectors implementing polygonal rough surfaces

This study presents a CFD - simulation analysis of the thermal performance of hybrid nanofluids like multi-walled carbon nanotubes with Aluminium Oxide + water (MWCNT - Al2O3/H2O), aluminium oxide, and copper oxide with base water (Al2O3CuO/H2O) and aluminium oxide with base water (Al2O / H2O) in s...

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Bibliographic Details
Main Authors: B. Varun Kumar, P. Rajesh Kanna, R․H․B․ Ramamurthy, Dhinesh Balasubramanian, Utku Kale, Artūras Kilikevičius
Format: Article
Language:English
Published: Elsevier 2025-09-01
Series:Results in Engineering
Subjects:
Hybrid nanofluids
Solar collectors
Thermal performance
Polygonal rough surfaces
Heat transfer enhancement
Online Access:http://www.sciencedirect.com/science/article/pii/S2590123025019620
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Summary:This study presents a CFD - simulation analysis of the thermal performance of hybrid nanofluids like multi-walled carbon nanotubes with Aluminium Oxide + water (MWCNT - Al2O3/H2O), aluminium oxide, and copper oxide with base water (Al2O3CuO/H2O) and aluminium oxide with base water (Al2O / H2O) in solar collectors with implementing forward faced polygonal shaped rough surfaces. The ribbed surface is arranged at a relative pitch distance of p/e = 5 and relative roughness height e/D = 0.2. The thermal performances are ascertained by Nusselt Number (Nu), friction factor (ƒ), and thermo-hydraulic performances (THP) by varying Reynolds Number (Re) ranging from Re 10,000 to Re 50,000. Hybrid nanofluids with forward-faced polygonal rough surfaces significantly enhance thermal efficiency, validated by selecting the RNG k-e turbulence model were compared with the Gnielinski equation for smooth surfaces. The research reveals that higher convective heat transfer has been attained in (Al2O3/H2O) with a 4 % volume concentration of hybrid nanofluid with the highest THP values of 1.16 at Al2O3/H2O with 1 % volume concentration in a lower Reynolds number. Besides, a significant thermal enhancement was recorded in solar collectors by using a hybrid nanofluid rather than water.
ISSN:2590-1230

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