Experimental investigation of graphene nanoplatelets nanofluid-based volumetric solar collector for domestic hot water systems

Vakili, M.; Hosseinalipour, Seyed Mostafa; Delfani, Shahram; Khosrojerdi, S.; Karami, Maryam

doi:10.1016/j.solener.2016.02.034

Cited by 118 publications

(35 citation statements)

References 46 publications

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“…Nanofluids with ζ-potentials higher than 60 mV are known as having excellent stabilization [220]. Many researchers [131,133,135,136] utilized ZPT to study the stability of nanofluids because of the simplicity of the technique. Vakili et al [142] utilized this method for GNP nanofluids, and Tahani et al [143] also utilized it for GO nanoplatelets.…”

Section: Stability Evaluation Methods For Nanofluidsmentioning

confidence: 99%

“…Oleylamine [133] ZPT N/A N/A [135] ZPT, UV-Vis~ 60 days Gum arabic, cetyltrimethylammonium bromide, sodium dodecyl sulfate, sodium dodecyl benzene sulfonate [136] ZPT N/A N/A [139] UV-Vis~ 200 days Triton X-100 [76] SPC~ 30 days N/A [142] ZPT~ 45 days N/A [143] ZPT N/A N/A [77] ZPT, DLS N/A N/A [78] ZPT N/A N/A [65] UV-Vis~ 1 week N/A [54] ZPT N/A Gum arabic, Tween 80, CTAB, Triton X100, Acumer Terpolymer [80] UV-Vis~ 10 days Triton X-100 [147] UV-Vis~ 10 days N/A [74] ZPT N/A N/A [149] SEM 12 h N/A [156] SPC~ 30 days N/A [157] ZPT, UV-Vis~ 2 weeks N/A [158] ZPT N/A N/A [64] SPC, UV-Vis~ 2 weeks N/A [159] UV-Vis~ 60 days N/A [161] UV-Vis~ 528 h N/A [162] UV-Vis~ 15 days Sodium deoxycholate [66] UV-Vis > 5 months N/A [67] UV-Vis, ZPT N/A N/A in an ammonia solution. Grinding can be utilized to enhance significantly the dispersibility property in BF water [207].…”

Section: Stability Enhancement Proceduresmentioning

confidence: 99%

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Review on the recent progress in the preparation and stability of graphene-based nanofluids

Mahian

Wongwises

et al. 2020

J Therm Anal Calorim

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Graphene has attracted much attention from the science world because of its mechanical, thermal, and physical properties. Graphene nanofluid is well known for its easy synthesis, longer suspension stability, higher heat conductivity, lower erosion, corrosion, larger surface area/volume ratio, and lower demand for pumping power. This article is an audit of experimental outcome about the preparation and stability of graphene-based nanofluids. Numerous researches to prepare and stabilize graphene-based nanofluids have been developed, and it is indispensable to create a complete list of the approaches. This research work outlines the advancement on preparation and assessment methods and the techniques to enhance the stability of graphene nanofluids and outlook prospects.

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Section: Stability Evaluation Methods For Nanofluidsmentioning

confidence: 99%

Section: Stability Enhancement Proceduresmentioning

confidence: 99%

Review on the recent progress in the preparation and stability of graphene-based nanofluids

Mahian

Wongwises

et al. 2020

J Therm Anal Calorim

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“…Also, best corrosion resistance property is noticed for Cr coating obtained from Cr (III) plating bath containing formic acid and graph. [41][42][43][44] Hence, the incorporation of graphene in chromium metal matrix may significantly enhance the efficiency of solar cells by enhanced photothermal energy absorption. [7][8][9]36,37 In the present work, the morphology of the coating C FG is significantly enhanced compare to C F .…”

Section: Resultsmentioning

confidence: 99%

Electrochemical behaviour of chromium–graphene composite coating

2016

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This work illustrates the role of graphene in enhancing the corrosion resistant property of chromium-graphene composite coating when compared to the corrosion resistant property of pure chromium coating containing ZnO nanoparticles. Chromium based coatings have been used extensively due to their various useful attributes such as corrosion and wear resistance and enhanced surface finish. In this work, Cr and Cr-graphene composite coatings were electrodeposited over mild steel substrate using Cr(III) plating bath. To deposit the coatings, electrodeposition method was also adopted due to its attributes such as low cost, less equipment intensive methodology, accuracy of reproduction and suitability for large scale surface modification. Three different coatings were produced: (a) Cr coating containing ZnO nanoparticles (C), (b) Cr coating containing ZnO nanoparticles deposited using formic acid (C F ) and (c) Cr coating containing ZnO nanoparticles and graphene deposited using formic acid (C FG ). Graphene used in the deposition process was produced from the electrochemical exfoliation of graphite in sodium lauryl sulphate (SLS) electroactive media. ZnO nanoparticles were synthesized using the precipitation method followed by calcination. Microstructural charaterization of the coatings revealed that the coating 'C' contained large cracks. Addition of formic acid (in the coating C F ) noticeably reduced the cracks in the coating which now also contained hillock structures. Addition of graphene (in coating C FG ) further enhanced the coating 2 morphology which now contained negligible cracks and increased hillock structures completely covering its surface. Diffraction analysis revealed that the addition of graphene also altered the texture of the chromium coatings. Potentiodynamic polarization and electrochemical impedance spectroscopic analysis revealed that the change in the morphology and microstructure of the deposit due to the addition of graphene substantially enhanced the corrosion resistance of the C FG coating when compared to both C and C F coatings.Hard chromium coatings are extensively applied due to attributes such as mechanical strength, 1 wear and corrosion resistance, 2 and ability to provide decorative appearance to tools and machineries etc. 3 Generally, chromium plating bath containing Cr(VI)/hexavalent chromium ions is used to deposit chromium. 4 Carcinogenicity and serious environmental problems posed by the hexavalent chromium ions has encouraged development of eco-friendly trivalent chromium/Cr(III) plating baths 5 for depositing chromium coatings. It was however observed that the chromium coatings produced from trivalent chromium bath contained cracks which deteriorated the ability of the coating towards protecting the degradation of the underlying substrate. 2,6 Cracks can be reduced by modifying the morphology of the deposit by altering the deposition parameters or using additives. 7 Danilov et al 8 and Surviliene et al 9 produced crack free chromium coating using trivalent chromium plating bat...

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“…The application of nanofluids in low‐temperature DASCs has been the focus of various experimental and theoretical/numerical studies . A comprehensive review of the subject is found in .…”

Section: Introductionmentioning

confidence: 99%

“…The effect of adding aluminum oxide nanoparticles (with a diameter of 20 nm) to the water with different volume fractions was investigated by Gupta et al They reported a maximum enhancement of 39% in the instantaneous collector efficiency for a 0.005% volume fraction. In a similar experimental set‐up, the effects of bottom wall optical conditions (black or reflective wall) and the volume fractions of graphene nanoparticles in different mass flow rates were studied by Karami et al and Vakili et al, respectively. In a recent study, Karami et al investigated the energy and exergy efficiencies in a DASC in which the effect of V‐shaped rib roughness in DASC bottom is considered.…”

Section: Introductionmentioning

confidence: 99%

Performance enhancement of a direct absorption solar collector using copper oxide porous foam and nanofluid

Esmaeili

Karami

Delfani³

2020

Int J Energy Res

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The current research proposes the idea of using water-saturated metal oxide foams and water-based nanofluids as solar absorber in the direct absorption solar collectors (DASCs). Specifically, the novel solar collector design utilizes copper oxide (CuO) porous foam and nanoparticle with high optical properties and is expected to have enhanced thermal performance than the conventional collectors utilizing pure water. The finite volume technique is used to solve the governing equations of flow and heat transfer in the radiative participating media. Also, to establish the reliability and accuracy of numerical solutions, the obtained results are compared with the corresponding numerical and experimental data. The computations are carried out for different nanoparticle volume fractions, foam pore sizes, working fluid mass flow rates, and both porous layer thicknesses and positions (inserted at the lower or upper wall of the collector). It is found that the efficiency of DASC partially/fully filled with metal oxide foam is maximized when the collector is completely filled with it. Compared with the water flow, the numerical results show that the collector efficiency using CuO nanofluid and metal oxide foam is improved by up to 26.8% and 23.8%, respectively. Moreover, considering the second law of thermodynamics, the use of CuO nanofluids in the DASC seems to be more effective than the use of CuO porous foam. K E Y W O R D Sdirect absorption solar collector, efficiency, metal oxide foam, nanofluid, second law of thermodynamics

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Experimental investigation of graphene nanoplatelets nanofluid-based volumetric solar collector for domestic hot water systems

Cited by 118 publications

References 46 publications

Review on the recent progress in the preparation and stability of graphene-based nanofluids

Review on the recent progress in the preparation and stability of graphene-based nanofluids

Electrochemical behaviour of chromium–graphene composite coating

Performance enhancement of a direct absorption solar collector using copper oxide porous foam and nanofluid

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