A Novel Experimental Study on the Rheological Properties and Thermal Conductivity of Halloysite Nanofluids

Ba, Thong Le; Alkurdi, Ahmed Qani; Lukács, István Endre; Molnár, János; Wongwises, Somchai; Gróf, Gyula; Szilágyi, Imre Miklós

doi:10.3390/nano10091834

Cited by 37 publications

(9 citation statements)

References 61 publications

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“…The property enhancement is dependent on the type, size, shape, and concentration of nanoparticles. Moreover, the nature and characteristic of base fluids such as pH, µ, and the presence of surfactants affect the increment of k [ 14 , 15 ]. However, the disadvantage of nanofluids is the stability issue because the nanoparticles tend to aggregate into larger particles and clusters.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Carbon Nanosphere and Carbon Nanopowder on Viscosity and Thermal Conductivity of Nanofluids

Bohus

Lukács

et al. 2021

Nanomaterials

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A comparative research on stability, viscosity (µ), and thermal conductivity (k) of carbon nanosphere (CNS) and carbon nanopowder (CNP) nanofluids was performed. CNS was synthesized by the hydrothermal method, while CNP was provided by the manufacturer. Stable nanofluids at high concentrations 0.5, 1.0, and 1.5 vol% were prepared successfully. The properties of CNS and CNP nanoparticles were analyzed with Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), specific surface area (SBET), X-ray powder diffraction (XRD), thermogravimetry/differential thermal analysis (TG/DTA), and energy dispersive X-ray analysis (EDX). The CNP nanofluids have the highest k enhancement of 10.61% for 1.5 vol% concentration compared to the base fluid, while the CNS does not make the thermal conductivity of nanofluids (knf) significantly higher. The studied nanofluids were Newtonian. The relative µ of CNS and CNP nanofluids was 1.04 and 1.07 at 0.5 vol% concentration and 30 °C. These results can be explained by the different sizes and crystallinity of the used nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Comparative Study of Carbon Nanosphere and Carbon Nanopowder on Viscosity and Thermal Conductivity of Nanofluids

Bohus

Lukács

et al. 2021

Nanomaterials

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“…Published reports described that nanofluids of enhanced thermal conductivities also showed better convective flow performance [ 319 , 323 ]. Carbon allotropes based nanofluids have higher thermal conductivities compared to the metallic and oxide based nanofluids [ 324 , 325 , 326 ]. Therefore, nuclear scientists have already started to investigate the flow boiling performance of various carbon-based nanofluids.…”

Section: Thermal Applicationsmentioning

confidence: 99%

Carbon-Based Nanofluids and Their Advances towards Heat Transfer Applications—A Review

et al. 2021

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Nanofluids have opened the doors towards the enhancement of many of today’s existing thermal applications performance. This is because these advanced working fluids exhibit exceptional thermophysical properties, and thus making them excellent candidates for replacing conventional working fluids. On the other hand, nanomaterials of carbon-base were proven throughout the literature to have the highest thermal conductivity among all other types of nanoscaled materials. Therefore, when these materials are homogeneously dispersed in a base fluid, the resulting suspension will theoretically attain orders of magnitude higher effective thermal conductivity than its counterpart. Despite this fact, there are still some challenges that are associated with these types of fluids. The main obstacle is the dispersion stability of the nanomaterials, which can lead the attractive properties of the nanofluid to degrade with time, up to the point where they lose their effectiveness. For such reason, this work has been devoted towards providing a systematic review on nanofluids of carbon-base, precisely; carbon nanotubes, graphene, and nanodiamonds, and their employment in thermal systems commonly used in the energy sectors. Firstly, this work reviews the synthesis approaches of the carbon-based feedstock. Then, it explains the different nanofluids fabrication methods. The dispersion stability is also discussed in terms of measuring techniques, enhancement methods, and its effect on the suspension thermophysical properties. The study summarizes the development in the correlations used to predict the thermophysical properties of the dispersion. Furthermore, it assesses the influence of these advanced working fluids on parabolic trough solar collectors, nuclear reactor systems, and air conditioning and refrigeration systems. Lastly, the current gap in scientific knowledge is provided to set up future research directions.

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“…In many studies, researchers have combined different nanomaterials to obtain novel composites with better properties [7,8] and nanofluids with higher HT efficiency [9][10][11][12][13][14]. Suresh et al [15] synthesised Cu-Al 2 O 3 /water hybrid nanofluids with 0.1 and 2 vol% via a two-step method.…”

Section: Introductionmentioning

confidence: 99%

A CFD Study on Heat Transfer Performance of SiO2-TiO2 Nanofluids under Turbulent Flow

Gróf

Odhiambo

et al. 2022

Nanomaterials

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A CFD model was performed with commercial software through the adoption of the finite volume method and a SIMPLE algorithm. SiO2-P25 particles were added to water/ethylene glycol as a base fluid. The result is considered a new hybrid nanofluid (HN) for investigating heat transfer (HT). The volume concentrations were 0.5, 1.0, and 1.5%. The Reynolds number was in the range of 5000–17,000. The heat flux (HF) was 7955 W/m2, and the wall temperature was 340.15 K. The numerical experiments were performed strictly following the rules that one should follow in HT experiments. This is important because many studies related to nanofluid HT overlook these details. The empirical correlations that contain the friction factor perform better with higher Reynolds numbers than the correlations based only on Reynolds and Prandtl numbers. When temperature differences are moderate, researchers may consider using constant properties to lower computational costs, as they may give results that are similar to temperature-dependent ones. Compared with previous research, our simulation results are in agreement with the experiments in real time.

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A Novel Experimental Study on the Rheological Properties and Thermal Conductivity of Halloysite Nanofluids

Cited by 37 publications

References 61 publications

Comparative Study of Carbon Nanosphere and Carbon Nanopowder on Viscosity and Thermal Conductivity of Nanofluids

Comparative Study of Carbon Nanosphere and Carbon Nanopowder on Viscosity and Thermal Conductivity of Nanofluids

Carbon-Based Nanofluids and Their Advances towards Heat Transfer Applications—A Review

A CFD Study on Heat Transfer Performance of SiO2-TiO2 Nanofluids under Turbulent Flow

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