Dispersing mechanism and tribological performance of vegetable oil-based CNT nanofluids with different surfactants

Gao, Teng; Li, Changhe; Zhang, Yanbin; Yang, Min; Jia, Dongzhou; Jin, Tan; Hou, Yu; Li, Runze

doi:10.1016/j.triboint.2018.10.025

Cited by 392 publications

(57 citation statements)

References 43 publications

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“…This finding were also supported by Sarsam et al, [45], which the viscosity value of 0.1wt% water based-MWCNTs in their study rise up to 25.04% in comparison to water. Another factor that contributed to the increase value of viscosity is the addition of surfactant in nanofluids as been proved by Gao et al, [46] in their study by comparing various surfactant and its effect on viscosity values. Throughout their findings, by adding the surfactants in CNT nanofluid, the viscosity increased to different extents depending on which type of surfactant were used.…”

Section: Thermal Conductivity Enhancementmentioning

confidence: 89%

Thermal Conductivity and Viscosity of TiO2/MWCNTs (doped 10wt% graphene) - Ethylene Glycol Based Nanofluids for Different Ratio of Nanoparticle

Rahman¹,

Akhtar²,

Kadirgama³

et al. 2020

ARFMTS

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The use of nanofluids to boost the thermal performance of conventional work fluids has recently shown considerable interest. This paper aims to analyse the thermal conductivity, viscosity and stability of titanium dioxide (TiO2)-multi-walled carbon nanotubes (MWCNTs) nanofluid in the presence of sodium dodecyl benzene sulfonate (SDBS) as a surfactant. The enhancement of thermal physical properties of nanofluids in this study investigated under different concentrations and ratios of the nanoparticle. Ethylene glycol (base fluid), TiO2 and CNTs nanoparticle mixed to produce hybrid nanofluid with concentration 0.02 to 0.1 wt.% with 0.02 wt% interval. The mixing ratio of TiO2: MWCNTs was 90:10 and 80:20, meanwhile the ratio of SDBS: MWCNTs was 10:1. The stability of nanofluid was confirmed by using the observation method and zeta potential analysis. The thermal conductivity and viscosity of suspension were measured to determine the relationship between concentration on nanofluid and thermal physical properties. Based on results obtained, zeta potential value for both nanofluid with different ratios range from -50 to -70 mV indicates excellent stability of the suspension. Thermal conductivity of nanofluid increase as nanofluid concentration and temperature increase and also shows enhancement compared to the base fluid. However, the increment in thermal conductivity for nanofluid with ratio 90:10 was more stable and higher throughout the increasing temperature compared to nanofluid with ratio 80:20. Meanwhile, the viscosity value of nanofluid shows decrements over increased temperature and increment over increase volume concentration. In conclusion, the developed nanofluid with both ratios in this study found to be stable, with enhanced thermal conductivity and viscosity.

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Section: Thermal Conductivity Enhancementmentioning

confidence: 89%

Thermal Conductivity and Viscosity of TiO2/MWCNTs (doped 10wt% graphene) - Ethylene Glycol Based Nanofluids for Different Ratio of Nanoparticle

Rahman¹,

Akhtar²,

Kadirgama³

et al. 2020

ARFMTS

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“…They proved that the nano lubricants were containing 0.1 wt.% CNTs reduce the coefficient of friction compared to the pure fluid by 20%. Gao et al 37 analyzed the dispersing properties, molecular structures, and physicochemical properties of six types of surfactants, also investigated the tribological properties of CNTs nanofluid with different surfactants. They found that among the six surfactants, nanofluids containing APE-10 showed the optimal dispersion and tribological properties.…”

Section: Introductionmentioning

confidence: 99%

Comparison between multi-walled carbon nanotubes and titanium dioxide nanoparticles as additives on performance of turbine meter oil nano lubricant

Pourpasha

Heris

Mohammadfam

2021

Sci Rep

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This research aims of compare the impact of the mass fraction of multi-walled carbon nanotubes (MWCNTs) and titanium dioxide (TiO2) nano additive on the tribological and thermophysical attributes of turbine meter oil. These attributes include the average friction coefficient, pressure drop, wear, flash point, pour point, relative viscosity, kinematics viscosity, and viscosity index. The pressure drops and the average friction coefficient inside the copper tube were simulated and compared with experimental results. In this study, for the synthesis of nano lubricants from turbine meter oil as a pure fluid and from MWCNTs and TiO2 as nano additives in the mass fraction of 0.05, 0.1, 0.2, 0.3, and 0.4 wt.% and from oleic acid and Triton x100 as surfactants were utilized. The results illustrated that the wear depth of copper pins in the presence of nano lubricant with 0.4 wt.% of MWCNTs and 0.1 wt.% TiO2 was improved by 88.26% and 71.43%, respectively. Increasing 0.3 wt.% of TiO2 and MWCNTs into the oil caused to improvement in viscosity index. The simulation data and experimental data for the pressure drop were closer together and indicated a minor error that the maximum error is less than 10%.

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“…Nanofluid has been recently widely employed in various heat transfer applications to improve the thermophysical properties of the working fluid toward higher heat transfer performance [19,22,[44][45][46][47]. Regarding twisted tape inserted tubes, there are several studies on the simultaneous usage of nanofluid and twisted tapes for a higher rate of heat transfer [12,[48][49][50][51]. Qi et al [52] investigated the convective nanofluid heat transfer in a tube using rotating and static built-in twisted tape elements, experimentally.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

Zhu

Mashayekhi

et al. 2021

Nanomaterials

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The hydrothermal performance of multiple semi-twisted tape inserts inside a heat exchanger pipe is numerically examined in three-dimensions. This study aims to find the optimum case for having the highest heat transfer enhancement with the lowest friction factor using nanofluid (Al2O3/water). A performance evaluation criterion (PEC) is defined to characterize the performance based on both friction factor and heat transfer. It was found that increasing the number of semi-twisted tapes increases the number of swirl flow streams and leads to an enhancement in the local Nusselt number as well as the friction factor. The average Nusselt number increases from 15.13 to 28.42 and the average friction factor enhances from 0.022 to 0.052 by increasing the number of the semi-twisted tapes from 0 to 4 for the Reynolds number of 1000 for the base fluid. By using four semi-twisted tapes, the average Nusselt number increases from 12.5 to 28.5, while the friction factor reduces from 0.155 to 0.052 when the Reynolds number increases from 250 to 1000 for the base fluid. For the Reynolds number of 1000, the increase in nanofluid concentration from 0 to 3% improves the average Nusselt number and friction factor by 6.41% and 2.29%, respectively. The highest PEC is equal to 1.66 and belongs to the Reynolds number of 750 using four semi-twisted tape inserts with 3% nanoparticles. This work offers instructions to model an advanced design of twisted tape integrated with tubes using multiple semi-twisted tapes, which helps to provide a higher amount of energy demand for solar applications.

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Dispersing mechanism and tribological performance of vegetable oil-based CNT nanofluids with different surfactants

Cited by 392 publications

References 43 publications

Thermal Conductivity and Viscosity of TiO2/MWCNTs (doped 10wt% graphene) - Ethylene Glycol Based Nanofluids for Different Ratio of Nanoparticle

Thermal Conductivity and Viscosity of TiO2/MWCNTs (doped 10wt% graphene) - Ethylene Glycol Based Nanofluids for Different Ratio of Nanoparticle

Comparison between multi-walled carbon nanotubes and titanium dioxide nanoparticles as additives on performance of turbine meter oil nano lubricant

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

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