Experimental investigation of thermo-physical properties, convective heat transfer and pressure drop of functionalized graphene nanoplatelets aqueous nanofluid in a square heated pipe

Yarmand, Hooman; Gharehkhani, Samira; Shirazi, Seyed Farid Seyed; Amiri, Ahmad; Alehashem, Maryam; Dahari, Mahidzal; Kazi, S. N.

doi:10.1016/j.enconman.2016.02.008

Cited by 102 publications

(48 citation statements)

References 67 publications

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“…As for instance, acid treatment can improve the dispersible ability of graphene in BF and enhance the TC of GNF [207]. Yarmand et al [147,161] studied the functionalized GNPs-based nanofluids from a simple acid treatment reaction procedure, and the nanofluids were stable for a long time without sedimentation. Vallejo et al [208] investigated the effect of various pH values of GNP nanofluids in propylene glycol-water mixture and observed that the absolute values of zeta potential were higher than 30 mV for samples with pH values above 6.…”

Section: Stability Enhancement Proceduresmentioning

confidence: 99%

“…It was noted that the combination of silver and graphene in the composite material considerably improved the thermal conductivity of BF and the specific surface area is enhanced. Yarmand et al [147,161] increased the stability of nanofluids by introducing the hydroxyl and carboxyl function groups toward the GNP surface. With the same purpose, Mehrali et al [80] prepared NDG by a hydrothermal process with GO as a raw material [205] SPC + UV-Vis N/A Polymers P19 and P20 [206] ZPT N/A Changing pH [104] SPC + TC~ 7 days N/A [105] TC~ 150 days (5 months) N/A [117] SPC + UV-Vis~ 7 days N/A [118] SPC, UV-Vis, ZPT~ 60 days N/A [115] SPC N/A N/A [114] SPC, UV-Vis, ZPT~ 180 days (6 months) Triton X-100 [113] SPC N/A N/A [112] SPC 24 h N/A [3] SPC, UV-Vis, ZPT 600 h N/A [107] UV-Vis 1 week PVA [123] SPC 7 days N/A [122] ZPT + SPC N/A Modifying pH and tannic acid [121] SPC 2 months Modifying pH [124] SPC 4 days SDBS [129] SPC + UV-Vis 256 h N/A [131] ZPT, PSD, SPC~ 1 month Sodium carboxymethyl celluloses [132] DLS + TC > 2 months (0.005%), few days (> 0.005%)…”

Section: Stability Enhancement Proceduresmentioning

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%

See 2 more Smart Citations

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

Mahian

Wongwises

et al. 2020

J Therm Anal Calorim

106

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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 Enhancement Proceduresmentioning

confidence: 99%

Section: Stability Enhancement Proceduresmentioning

confidence: 99%

Section: Stability Enhancement Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

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

Mahian

Wongwises

et al. 2020

J Therm Anal Calorim

106

View full text Add to dashboard Cite

show abstract

“…Although density and specific heat capacity can be easily predicted from a theoretical approach, thermal conductivity and viscosity must be carefully determined because there are not yet models that can accurately predict the transport properties of nanofluids [ 23 , 24 ]. Over the last years, several studies about the thermophysical and heat transfer performance of graphene nanoplatelet aqueous nanofluids have been reported in the literature [ 22 , 25 , 26 , 27 , 28 , 29 , 30 ]. However, most of them only analyze the effect of nanoplatelet addition at low mass concentrations.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Performance of Functionalized Graphene Nanoplatelet Aqueous Nanofluids

et al. 2016

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The low thermal conductivity of fluids used in many industrial applications is one of the primary limitations in the development of more efficient heat transfer systems. A promising solution to this problem is the suspension of nanoparticles with high thermal conductivities in a base fluid. These suspensions, known as nanofluids, have great potential for enhancing heat transfer. The heat transfer enhancement of sulfonic acid-functionalized graphene nanoplatelet water-based nanofluids is addressed in this work. A new experimental setup was designed for this purpose. Convection coefficients, pressure drops, and thermophysical properties of various nanofluids at different concentrations were measured for several operational conditions and the results are compared with those of pure water. Enhancements in thermal conductivity and in convection heat transfer coefficient reach 12% (1 wt %) and 32% (0.5 wt %), respectively. New correlations capable of predicting the Nusselt number and the friction factor of this kind of nanofluid as a function of other dimensionless quantities are developed. In addition, thermal performance factors are obtained from the experimental convection coefficient and pressure drop data in order to assess the convenience of replacing the base fluid with designed nanofluids.

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“…Also, among different geometries and for different Re, tube with square section has lower average heat transfer coefficient. Thermal boundary layer thickness and thermal resistance is diminished with increasing of Re [41]. Thus, the amount of average heat transfer coefficient is increased.…”

Section: Study Of Pressure Drop Heat Transfer Rate and Fom At Differmentioning

confidence: 93%

A Comprehensive Numerical Study on Nanofluid Flow and Heat Transfer of Helical, Spiral and Straight Tubes with Different Cross Sections

Abdi¹,

Asaadi²,

Kivi³

et al. 2019

IJHT

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A numerical comparative analysis is carried out on heat transfer performance of laminar fluid flow of water/Al2O3 nanofluid in straight, spiral and helical tubes with various cross sections. Circular, triangular, rectangular and square cross-section in an identical length are considered as geometrical variables. Nanoparticles of Al2O3 added into the water (as base fluid) with volume fractions of 0.1-0.7 and it was flowed through different types of tubes, for different Reynolds number. Governing equations on fluid flow were solved based on finite element method. Results show, adding nanoparticles improves heat transfer as well as pressure drop. Among all types of tubes, helical-shaped tube has higher amount of heat transfer and pressure drop compared to spiral and straight. In a specific geometry at constant volume fraction and Re, highest heat transfer and pressure drop is related to the tube with rectangular cross-section. In all volume fractions and sections, average heat transfer coefficient in helical tube is higher than spiral and straight. Although helical tube has better heat transfer performance compared to spiral and straight, pressure drop between outlet and inlet in helical is higher than spiral and straight tubes. As a result, amount of FOM, the ratio of heat transfer to pressure drop, for helical geometry is lower than spiral and straight.

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Experimental investigation of thermo-physical properties, convective heat transfer and pressure drop of functionalized graphene nanoplatelets aqueous nanofluid in a square heated pipe

Cited by 102 publications

References 67 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

Heat Transfer Performance of Functionalized Graphene Nanoplatelet Aqueous Nanofluids

A Comprehensive Numerical Study on Nanofluid Flow and Heat Transfer of Helical, Spiral and Straight Tubes with Different Cross Sections

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