Experimental investigation of heat transfer and friction coefficient of the water/graphene oxide nanofluid in a pipe containing twisted tape inserts under air cross-flow

Ranjbarzadeh, Ramin; Isfahani, Amir Homayoon Meghdadi; Hojaji, Mohammad

doi:10.1080/08916152.2018.1431736

Cited by 27 publications

(5 citation statements)

References 30 publications

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“…Nowadays, nanotechnology provides exciting new possibilities especially on the enhancement of the dielectric insulating fluids performances such as electrical properties, PD, diffusivity, thermal conductivity, cooling properties, viscosity, heat exchanger, friction and heat transfer coefficients [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 ]. Various factors such as intrinsic properties, volume concentrations, contact areas of solid-liquid, surfactants suspension and synthesis approaches could affect the performances of nanoparticles in dielectric insulating fluids [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Partial Discharge Characteristics of Palm Oil and Coconut Oil Based Al2O3 Nanofluids in the Presence of Sodium Dodecyl Sulfate

et al. 2021

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This experimental study aims to examine the partial discharge (PD) properties of palm oil and coconut oil (CO) based aluminum oxide (Al2O3) nanofluids with and without surfactants. The type of surfactant used in this study was sodium dodecyl sulfate (SDS). The volume concentrations range of Al2O3 dispersed in oil samples was varied from 0.001% to 0.05%. The ratio of surfactants to nanoparticles was set to 1:2. In total, two different types of refined, bleached and deodorized palm oil (RBDPO) and one type of CO were measured for PD. Mineral oil (MO) was also examined for comparison purpose. PDIV measurements for all samples were carried out based on rising voltage method whereby a needle-sphere electrode configuration with a gap distance of 50 mm was chosen in this study. Al2O3 improves the PDIVs of RBDPO, CO and MO whereby the highest improvements of PDIVs are 34%, 39.3% and 27%. The PD amplitude and repetition rate of RBDPO improve by 38% and 81% while for CO, it can increase up to 65% and 80% respectively. The improvement of PD amplitude and repetition rate for MO are 18% and 95%, regardless with and without SDS. Without SDS, the presence of Al2O3 could cause 26%, 75% and 65% reductions of the average emission of light signals for RBDPOA, RBDPOB and CO with the improvement of PD characteristics but both events do not correlate at the same volume concentration of Al2O3. On the other hand, the average emission of light signal levels of the oils increases with the introduction of SDS. The emission of light signal in MO does not correlate with the PD characteristics improvement either with or without SDS.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Partial Discharge Characteristics of Palm Oil and Coconut Oil Based Al2O3 Nanofluids in the Presence of Sodium Dodecyl Sulfate

et al. 2021

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“…have applied nanofluids to determine the amount of convective heat transfer and the behaviour of nanofluids in different circumstances as predicted. Most of these researchers used nanofluid sand mechanical methods such as twisted tapes [22][23][24][25], helical tubes [26][27][28], microfin tubes [29,30], and annulus tubes [31,32]. The results of these investigations showed that the convective heat transfer improves substantially when mechanical methods and nanofluids are applied.…”

Section: Rdms000854 15(1)2021mentioning

confidence: 99%

“…The results of these investigations showed that the convective heat transfer improves substantially when mechanical methods and nanofluids are applied. It can be seen that twisted tape is more effective than other mechanical methods due to intensified creation of vortex flow in the tube and the declination of the boundary layer [22][23][24][25]. Despite, a dramatic increase in pressure drops and Darcy friction factor, when it is used twisted tapes and nanofluid are observed.…”

Section: Rdms000854 15(1)2021mentioning

confidence: 99%

Analysing the Behaviour of Copper Oxide-Thermal Oil on Forced Convection and Pressure Drop in Upward and Downward Flow in Plain and Microfin Tube

Agrawal

Hekmatipour

2021

RDMS

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The effects of using copper oxide-thermal oil on convective heat transfer and pressure drop in a downward flow in an inclined microfin tube are investigated experimentally in this research project. The flow regime and wall temperature are laminar and constant, respectively. The effects of nanofluid, Graetz number, Prandtl number, negative and positive inclination angles, on convective heat transfer augment moderately as nanoparticles mass concentration increases. Correlations are advisable to anticipate Nusselt number and Darcy friction factor in upward and downward single-phase flow in microfin tube under constant wall temperature and laminar flow in inclined plain and finned tubes. The maximum aberration is lower than 21% which is acceptable to predict experimental data. In this paper, we found that the heat ratio matches the pumping ratio. It turns out that, if the increment of pressure drop is more than heat transfer enhancement, it will not be appropriate to use CuO-thermal oil, negative inclination angles and microfin tube. The maximum FOM was 64%, which, was calculated with 1.5% nanoparticles mass concentration and inclination angle 60º at Prandtl number 349 in microfin tube.

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“…Finally, according to the results, it can be claimed that synthesis of environmentally friendly nanoparticles of silicon oxide with a plant source for nanofluid production is important, and this type of nanofluid can be introduced as an environmentally friendly alternative fluid with high heat transfer potential in thermal systems. increasing the heat transfer rate to achieve high-efficiency, reduce fuel consumption, reduce air pollution, and compact thermal systems are great importance [1][2][3]. A convenient way to improve the heat transfer rate is to employ fluids with a higher heat transfer potential compared to other conventional fluids such as water, ethylene glycol, and oils [4].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

An experimental study on stability and thermal conductivity of water/silica nanofluid: Eco-friendly production of nanoparticles

Ranjbarzadeh

Moradikazerouni

Bakhtiari

et al. 2019

Journal of Cleaner Production

176

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In the present experimental study, an eco-friendly process (synthesized from rice plant source) was used to produce silica nanoparticles. Silica nanoparticles are environmentally friendly nanoparticles that have high heat transfer potential due to its abundant natural resources, low cost synthesis and mass production. The surface and atomic structure of the nanoparticles have been investigated through SEM and FTIR tests. After production of nanoparticles, water/silica nanofluid samples were prepared using two-step method that called eco-friendly nanofluid. Stability and thermal conductivity of the eco-friendly nanofluid were examined. Investigating the stability of the prepared samples, the DLS and TEM tests have been conducted as well as periodic visual observation of possible sedimentation over a period of six months through photography. The stability results indicated that the prepared samples possess excellent nano-structure and it showed long-time stability even after six months of preparation. The thermal conductivity measurement of the samples has been done in different temperatures ranging from 25 to 55 ℃ and solid volume fractions of 0.1, 0.25, 0.5, 1, 1.5, 2, 2.5, and 3 %. The results showed the maximum thermal conductivity

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Experimental investigation of heat transfer and friction coefficient of the water/graphene oxide nanofluid in a pipe containing twisted tape inserts under air cross-flow

Cited by 27 publications

References 30 publications

Experimental Study on the Partial Discharge Characteristics of Palm Oil and Coconut Oil Based Al2O3 Nanofluids in the Presence of Sodium Dodecyl Sulfate

Experimental Study on the Partial Discharge Characteristics of Palm Oil and Coconut Oil Based Al2O3 Nanofluids in the Presence of Sodium Dodecyl Sulfate

Analysing the Behaviour of Copper Oxide-Thermal Oil on Forced Convection and Pressure Drop in Upward and Downward Flow in Plain and Microfin Tube

An experimental study on stability and thermal conductivity of water/silica nanofluid: Eco-friendly production of nanoparticles

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