Stability and Thermophysical Properties of GNP-Fe2O3 Hybrid Nanofluid: Effect of Volume Fraction and Temperature

Borode, Adeola O.; Tshephe, Thato; Olubambi, Peter Apata; Sharifpur, Mohsen; Meyer, Josua P.

doi:10.3390/nano13071238

Cited by 11 publications

(6 citation statements)

References 36 publications

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“…The visualization technique [ 30 , 31 ] and zeta potential analysis (ZetaPALS-1) are effective methods for analyzing the stability of magnetic nanofluids. Figure 3 a shows the samples of the magnetic nanofluid with volume fractions of 0.2%, 0.5%, and 1%.…”

Section: Methodsmentioning

confidence: 99%

Stability and Photothermal Properties of Fe3O4-H2O Magnetic Nanofluids

et al. 2023

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Solar collectors are more efficient and commercial devices for collecting solar energy, compared to other solar energy utilizations. To improve the efficiency of solar collectors, it is important to prepare a liquid heat-collecting medium, which is stable and has high photothermal properties. Therefore, in this work, we develop a droplet–droplet mixing technique to prepare Fe3O4-H2O magnetic nanofluid. The results show that magnetic nanofluids prepared using the droplet–droplet mixing technique have more stable performance and a better encapsulation of dispersants than those prepared via traditional liquid–liquid mixing. Then, the thermal conductivity and photothermal properties of Fe3O4-H2O magnetic nanofluids are investigated experimentally and theoretically. The thermal conductivity and temperature of the magnetic nanofluid with Fe3O4 nanoparticles of a 1.0% volume fraction can reach the maximum value of 0.95 W/m∙K and 73.9 °C when the magnetic field strength is equal to the saturation magnetic field of 800 Gs. These findings provide insights into the potential applications of Fe3O4-H2O magnetic nanofluids in direct absorption solar collectors, heat exchangers, automobile radiators, etc.

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Section: Methodsmentioning

confidence: 99%

Stability and Photothermal Properties of Fe3O4-H2O Magnetic Nanofluids

et al. 2023

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“…Depending on the unique properties of the nanofluid, the thermal conductivity of the fluid can either rise or decrease with increasing concentration. According to research by Borode et al, [35] and Darabian et al, [36], as concentration increases, a nanofluid's thermal conductivity decreases. On the other hand, additional research has demonstrated that as concentration increases, the nanofluids' thermal conductivity also can increase [37,38].…”

Section: Thermophysical Properties Of Nanofluids 331 Thermal Conducti...mentioning

confidence: 98%

Formulation of Graphene Nanoplatelets Water-Based Nanofluids using Polyvinylpyrrolidone (PVP) as Surfactant

Nurul Izzati Akmal Muhamed Rafaizul,

Mohd Afzanizam Mohd Rosli,

Nurfarhana Salimen

et al. 2024

ARMNE

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Graphene nanoplatelets (GNP) have garnered significant interest owing to their remarkable mechanical properties, making them ideal materials for enhancing the heat transfer properties of nanofluids. However, the agglomeration of GNP in water-based nanofluids remains a significant challenge, limiting their practical applications. In this study, a comprehensive investigation into the formulation of water-based nanofluids using GNP is presented, with a focus on the incorporation of polyvinylpyrrolidone (PVP) as a surfactant to enhance their stability and dispersion. The nanofluid formulations were systematically prepared with varying concentrations of GNP and PVP to optimize their thermal properties. Additionally, the thermal conductivity and viscosity of the nanofluids were examined over a range of temperatures and concentrations. The results show that the formulation of GNP with 0.6 wt.% shows great potential as a nanofluid with 0.6611 W/mK and 1.22 mPa.s for thermal conductivity and viscosity, respectively. The findings also demonstrate that the incorporation of PVP significantly improves the stability and dispersion of GNP in water, leading to enhanced thermal conductivity and manageable viscosity. These findings contribute to the application of this nanofluid in various industries, specifically solar energy.

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“…Harandi et al [16] reported a 30% increase in the conductivity coefficient at a temperature of 50 • C and a volumetric fraction of 2.3% of hybrid nanofluids composed of Fe 2 O 3 nanoparticles, multi-walled carbon nanotubes, and ethylene glycol as the base fluids. Most of the research works carried out with hybrid nanoparticles, i.e., graphene/Fe 2 O 3 -added water-based nanofluids, have shown such enhancements in thermo-physical properties [17]. Furthermore, a recent experiment verified that Fe 2 O 3 /water-based nanofluids enhanced thermal conductivity by 21.35% at 0.08% volume fraction of Fe 2 O 3 [18].…”

Section: Introductionmentioning

confidence: 98%

Comparative Study on the Thermal Properties of Engine Oils and Their Nanofluids Incorporating Fullerene-C60, TiO2 and Fe2O3 at Different Temperatures

Galpaya,

Induranga,

Vithanage

et al. 2024

Energies

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The efficiency, durability, and overall performance of a car engine are influenced by several critical factors. The quality and properties of engine oil play a crucial role, and oil is used in internal combustion engines for lubrication and cooling purposes. This research study aimed to compare the impact of fullerene-C60 (99.5%), Fe2O3, and TiO2 nanoparticles on the thermal properties of C.A.L.T.E.X. red engine oil with grades 10W30, 20W40, and 20W50. This study focused on the effect of a nanoparticle concentration of 0.01 wt.% in different engine oil grades at various temperature values of 30–120 °C. The nanofluids were prepared using the two-step direct mixing method, employing a magnetic stirrer and an ultrasonicator, ensuring uniform distribution of nanoparticles in the base fluids. The thermal conductivity, thermal diffusivity, and volumetric heat capacity of the base fluids and nanofluids were measured using the FLUCON LAMBDA thermal conductivity meter. Additionally, flash points were measured using the flash point tester. It was concluded that the thermal properties of TiO2 and Fe2O3 showed considerable enhancement; in contrast, fullerene only showed a 212 °C flash point.

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Stability and Thermophysical Properties of GNP-Fe2O3 Hybrid Nanofluid: Effect of Volume Fraction and Temperature

Cited by 11 publications

References 36 publications

Stability and Photothermal Properties of Fe3O4-H2O Magnetic Nanofluids

Stability and Photothermal Properties of Fe3O4-H2O Magnetic Nanofluids

Formulation of Graphene Nanoplatelets Water-Based Nanofluids using Polyvinylpyrrolidone (PVP) as Surfactant

Comparative Study on the Thermal Properties of Engine Oils and Their Nanofluids Incorporating Fullerene-C60, TiO2 and Fe2O3 at Different Temperatures

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