Experimental study on the thermal conductivity of a water-based ternary hybrid nanofluid incorporating MWCNTs-COOH-Fe3O4-rGO

European Mechanical Science, Год журнала: 2025, Номер 9(1), С. 16 - 24

Опубликована: Март 20, 2025

This study explores the thermal conductivity characteristics of ternary nanofluids composed water-based Fe3O4-decorated carboxylated multi-walled carbon nanotubes (MWCNT-COOH), reduced graphene oxide (rGO), and Fe3O4-CNT-COOH/rGO nanocomposites. The investigation focuses on influence temperature nanocomposite concentration. Ultrasonic probes were employed to ensure stability nanofluid, its structural properties analyzed using scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), powder diffraction (XRD), Fourier-transform infrared (FT-IR). Thermal measurements conducted a KD-2 Pro analyzer across range 25-60 °C mass fraction 0.025-0.1%. Results demonstrated that ratio increased with higher solid volume fractions elevated temperatures. Notably, impact became more significant at concentrations. findings also revealed maximum enhancement approximately 50%, achieved 0.1% 60 °C.

Язык: Английский

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Entropy Based Optimization of Mini-Channel Heat Sinks with Advanced Ternary Nanofluids for Photovoltaic Cells and Geometrical Enhancements

Results in Engineering, Год журнала: 2025, Номер unknown, С. 104982 - 104982

Опубликована: Апрель 1, 2025

Язык: Английский

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Assessing thermophysical properties of Nanostructured Cellulose Nano Crystal (CNC) and Graphene Nanoplatelets (GNP) Additives in Palm Oil-Based Heat Transfer Fluid

E3S Web of Conferences, Год журнала: 2024, Номер 488, С. 02003 - 02003

Опубликована: Янв. 1, 2024

This study explores the examination of thermophysical characteristics eco-friendly CNC-Palm oil, GNP-Palm oil and CNC/GNP-palm mono hybrid nanofluids. The stability assessment involves a comprehensive analysis, incorporating visual observations thermal conductivity assessments. Notably, it was observed that an elevated proportion mixture contributed to enhanced nanosuspension, ensuring uniform dispersion nanomaterials within base liquid for extended period. results indicate nanofluids containing CNC/GNP formulated with palm exhibit substantial stability. A over impressive 30-day duration reveals minimal accumulation, underscoring enduring these also examines crucial physical properties, including viscosity about temperature. most significant enhancement witnessed in conductivity, achieving noteworthy 100% increase 0.1w/v% concentrated CNC/GNP/Palm Oil nanofluid at 70°C, demonstrating improvement compared fluid. Furthermore, there are noticeable increments viscosity, albeit more modest conductivity. These outcomes suggest direct relationship between increased concentrations can improve contributes valuable insights into utilizing applications, implications fields requiring performance fluid

Язык: Английский

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A Review of Heat Dissipation and Absorption Technologies for Enhancing Performance in Photovoltaic–Thermal Systems

Energies, Год журнала: 2024, Номер 17(7), С. 1721 - 1721

Опубликована: Апрель 3, 2024

With the growing demand for photovoltaic (PV) systems as a source of energy generation that produces no greenhouse gas emissions, effective strategies are needed to address inherent inefficiencies PV systems. These typically absorb only approximately 15% solar and experience performance degradation due temperature increases during operation. To these issues, PV–thermal (PVT) technology, which combines with thermal absorber dissipate excess heat convert it into additional energy, is being rapidly developed. This review presents an overview various PVT technologies designed prevent overheating in operational enhance transfer from cells absorber. The methods explored include innovative designs focus on increasing contact surface, using mini/microchannels improved contiguity, substituting traditional metal materials polymers reduce construction costs while utilizing polymer flexibility. also discusses incorporating phase change latent absorption nanofluids coolant mediums, offer higher conductivity than pure water. highlights significant observations challenges associated design, mini/microchannels, materials, terms waste dissipation. It includes summary relevant numerical experimental studies facilitate comparisons each development approach.

Язык: Английский

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Effect of twisted rib on the hydrothermal performance and entropy generation behavior in minichannel heat sinks cooled by biologically synthesized Ag/water nanofluid

Journal of Thermal Analysis and Calorimetry, Год журнала: 2024, Номер 149(12), С. 6433 - 6457

Опубликована: Май 30, 2024

Abstract This numerical research study focuses on impacts of using twisted rib geometry the hydrothermal performance and entropy generation characteristics biologically synthesized Ag/water nanofluid flowing in heat sink ‌minichannels. To this end, twelve different geometries (Case 1 to 12) were designed where double-row ribs at bottom top portions with twist angles between − 45° + 45°. elucidate cooling comprehensively, four Reynolds numbers (Re = 500, 1000, 1500, 2000) nanoparticle concentrations ( $$ \varphi \hspace{0.17em}$$ φ 0%, 0.1%, 0.5%, 1%) included computations. Results revealed that significantly smoothen fluid flow reduces pressure drop remarkably depending angles, nevertheless, it deteriorates performance. In Case 12, convective transfer coefficient by up 15.8% Re 2000 \varphi$$ =1%, compared base case. However, pumping power requirement is decreased 43.9% Nanoparticle incorporation contributes enhancement 13.5% lowest Re. Frictional considerably decreases (up 31%) when are utilized. thermal can increase 36%, due ineffective ribs. work be regarded as a first field concerning effects nanofluid-cooled mini-channel sinks.

Язык: Английский

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