The thermophysical properties and the stability of nanofluids containing carboxyl-functionalized graphene nano-platelets and multi-walled carbon nanotubes

Karami, Hadi; Papari-Zare, Solmaz; Shanbedi, Mehdi; Dashtbozorg, Amirhosein; Akbari, Amir; Mohammadian, Erfan; Heidari, Milad; Sahin, Ahmet Z.; Teng, Chew Bee

doi:10.1016/j.icheatmasstransfer.2019.104302

Cited by 35 publications

(10 citation statements)

References 43 publications

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“…HRTEM images did not show the COOH functional group but did show a few variations in surface deterioration, which may be evidence of successful functionalization of covalent. Some transparent flakes in the HRTEM images have shown that the GNPs have few layered structures [30] . The volume concentration is highly dependent as it increases the temperature relating thermal conductivity rises.…”

Section: Effect Of Ultrasonication On Graphene Nanofluidsmentioning

confidence: 99%

“…The density can be measured for the fluids without any consideration to the agglomerated particles and the concentration of the particles are affected by the sonication time with regards to the flake size by the empirical law (C = Kt ½ ) [106] . Sundar, Ramanathan [107] have estimated the density of nanofluids at various temperatures and concluded that density decreased with temperature increase and decreased particle size [30] . The size, shape, density, concentration, and sort of nanoparticle including the ultrasonication will affect the nanofluids stability.…”

Section: Ultrasonication Effect On Thermophysical Properties and Heat Tmentioning

confidence: 99%

“…Ultrasonication is unique homogenization technique utilized in variety of applications. It is a process which break large particle into smaller fragment or better uniform sized particles in the base fluid [29] , [30] . Sonication of nanofluid is achieved by providing sound energy to agitate the nanoparticles in the suspension [31] , [32] , [33] .…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ultrasonication an intensifying tool for preparation of stable nanofluids and study the time influence on distinct properties of graphene nanofluids – A systematic overview

Sandhya

Ramasamy

Sudhakar

et al. 2021

Ultrasonics Sonochemistry

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Section: Effect Of Ultrasonication On Graphene Nanofluidsmentioning

confidence: 99%

Section: Ultrasonication Effect On Thermophysical Properties and Heat Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ultrasonication an intensifying tool for preparation of stable nanofluids and study the time influence on distinct properties of graphene nanofluids – A systematic overview

Sandhya

Ramasamy

Sudhakar

et al. 2021

Ultrasonics Sonochemistry

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show abstract

“…Other measured properties of NF are flashpoint [ 51 ], contact angle [ 134 ], volumetric heat capacity [ 115 ], breakdown voltage [ 51 ], surface tension [ 135 ], extinction coefficient and transmittance [ 33 ] and shear stress [ 135 ], while those of HNF are flashpoint [ 68 ] and surface tension [ 47 ].…”

Section: Thermophysical Properties Of Nanofluids and Hybrid-nanoflmentioning

confidence: 99%

Experimental Research and Development on the Natural Convection of Suspensions of Nanoparticles—A Comprehensive Review

et al. 2020

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Suspensions of nanoparticles, widely known as nanofluids, are considered as advanced heat transfer media for thermal management and conversion systems. Research on their convective thermal transport is of paramount importance for their applications in such systems such as heat exchangers and solar collectors. This paper presents experimental research on the natural convection heat transfer performances of nanofluids in different geometries from thermal management and conversion perspectives. Experimental results and available experiment-derived correlations for the natural thermal convection of nanofluids are critically analyzed. Other features such as nanofluid preparation, stability evaluation and thermophysical properties of nanofluids that are important for this thermal transfer feature are also briefly reviewed and discussed. Additionally, techniques (active and passive) employed for enhancing the thermo-convection of nanofluids in different geometries are highlighted and discussed. Hybrid nanofluids are featured in this work as the newest class of nanofluids, with particular focuses on the thermophysical properties and natural convection heat transfer performance in enclosures. It is demonstrated that there has been a lack of accurate stability evaluation given the inconsistencies of available results on these properties and features of nanofluids. Although nanofluids exhibit enhanced thermophysical properties such as viscosity and thermal conductivity, convective heat transfer coefficients were observed to deteriorate in some cases when nanofluids were used, especially for nanoparticle concentrations of more than 0.1 vol.%. However, there are inconsistencies in the literature results, and the underlying mechanisms are also not yet well-understood despite their great importance for practical applications.

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“…By investigating nanofluids, it has been shown that these materials, which are a stable and homogenized suspension consist of a base fluid and additional nanoparticles as an additive, lead to notable enhancement in the thermal performance of this kind of heat exchangers [1][2][3][4] . Also, the studies showed that compared to fluids without nanoparticles, nanofluids have higher thermal conductivity significantly [5][6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the effect of single walled carbon nanotube/water nanofluid on the performance of a two-phase closed thermosyphon

Chehrazi

Moghadas

2021

JSCS

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Thermosyphons are one of the most efficient heat exchanger apparatus that are used extensively in different industries. One of the most common uses of this device is energy recovery, which is essential due to the energy crisis. Several parameters, such as geometric dimensions, type of working fluid, type of thermosyphon's body, affect a thermosyphon efficiency. In this experiment, the effect of type and concentration of single-walled carbon nanotube nanofluid (SWCNT / Water) on heat transfer efficiency in a two-phase closed thermosyphon (TPCT) has been investigated. For this purpose, a system with a two-phase closed thermosyphon was initially constructed. Then SWCNT/water nanofluids at 0.2, 0.5 and 1 % weight concentration were used as a working fluid in the thermosyphon system. The results of current experiments showed that the addition of nanofluid with any weight concentration and the increase of input power increases the performance of the system. Also, the heat resistance of TPCT reduced when the level of SWCNT and input power increased. So, for prepared nanofluid's samples, minimum thermal resistance obtained at 1 wt.% SWCNT and 120 W. Also, the Nusselt number increased with raising the input power and decreased with increasing the concentration. In all experiments, all prepared nanofluid samples have significantly better thermal performance in comparison with pure water.

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The thermophysical properties and the stability of nanofluids containing carboxyl-functionalized graphene nano-platelets and multi-walled carbon nanotubes

Cited by 35 publications

References 43 publications

Ultrasonication an intensifying tool for preparation of stable nanofluids and study the time influence on distinct properties of graphene nanofluids – A systematic overview

Ultrasonication an intensifying tool for preparation of stable nanofluids and study the time influence on distinct properties of graphene nanofluids – A systematic overview

Experimental Research and Development on the Natural Convection of Suspensions of Nanoparticles—A Comprehensive Review

Experimental study of the effect of single walled carbon nanotube/water nanofluid on the performance of a two-phase closed thermosyphon

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