Synergetic effects of nanoparticle concentration and electrification on the breakup performance of nanofluid fuel

Zhu, Zhuo; Li, Shengji; Lu, Yibin

doi:10.1016/j.ijheatmasstransfer.2019.04.002

Cited by 10 publications

(12 citation statements)

References 41 publications

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“…As the GNP concentration increased, the surface tension of nanofluid fuels first increased and then decreased, that is, there was a local maximum at a GNP concentration of ∼2.0 wt %. The phenomenon has been observed in the Al/ n -decane nanofluid fuels . For Al/ n -decane nanofluid fuel, there was a parabolic influence of Al nanoparticle concentration on the surface tension.…”

Section: Results and Discussionmentioning

confidence: 81%

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Effect of Nanoparticle Concentration on Physical and Heat-Transfer Properties and Evaporation Characteristics of Graphite/n-Decane Nanofluid Fuels

Yang

et al. 2022

ACS Omega

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n-Decane-based nanofluid fuels could be one of the most promising alternative fuels as aviation kerosene for aerospace application. However, the physical and heat-transfer properties of n-decane-based nanofuels have been rarely studied, and the influence of the concentration of nanoparticles on the evaporation characteristics of n-decane-based fuels has been sparsely investigated. This paper investigated physical and heat-transfer properties and evaporation characteristics of graphite/n-decane nanofluid fuels and emphasized the concentration effect of adding graphite nanoplatelets (GNPs) on these characteristics. It was found that there are a linear increase of density and thermal conductivity, a binomial increase of viscosity, and a binomial influence on surface tension as GNP concentration increases, while the boiling point almost remains constant, and the latent heat of vaporization largely decays. There exists a critical GNP concentration of 1.75 wt % for the evaporation performance. At 0∼1.75 wt %, the increase of GNP concentration benefits the evaporation. At 1.75∼4.0 wt %, the enhancement of GNP concentration deteriorates the evaporation performance. A detailed discussion of this evaporation behavior was made, which could be attributed to multiple factors, for example, the aggregation of nanoplatelets, the changes of physical and heat-transfer properties owing to the nanoparticle concentration effect, the surfactant concentration, and the ambient temperature. The concentration of surfactants has a binomial effect, and the ambient temperature has a linear effect on the evaporation rate. This study would promote in depth understanding of physical and heat-transfer properties and evaporation characteristics of nanofluid fuels and develop the application in turbine engines and ramjet engines.

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Section: Results and Discussionmentioning

confidence: 81%

“…The purity of n -decane and the surfactant was 98 and 99.5%, respectively. Their physical properties have been demonstrated in our previous work …”

Section: Methodsmentioning

confidence: 79%

Effect of Nanoparticle Concentration on Physical and Heat-Transfer Properties and Evaporation Characteristics of Graphite/n-Decane Nanofluid Fuels

Yang

et al. 2022

ACS Omega

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“…With increasing H 2 O 2 concentration, the volumetric charge density Q C ( φ ) and the surface-tension coefficient

simultaneously change. In our previous work [ 27 ], the critical concentration and minimum effective surface tension can be determined using the following equation:

…”

Section: Resultsmentioning

confidence: 99%

“…The characteristic parameters of atomized droplets of H 2 O 2 solutions, such as the number of droplets and particle-size distribution, were analyzed by digital imaging treatment described in our previous work [ 26 , 27 ].…”

Section: Methodsmentioning

confidence: 99%

Atomization Characteristics of Hydrogen Peroxide Solutions in Electrostatic Field

Sheng

2022

Micromachines

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Hydrogen peroxide (H2O2) can be considered as a sterilant or a green propellant. For a common use in industrial application, spray is an effective method to form fine H2O2 droplets. In this paper, electrostatic atomization based on the configuration of needle ring electrodes is proposed to produce H2O2 spray by minimizing its effective surface tension. The breakup performances of H2O2 ligaments can be improved by increasing the electric field intensity, reducing the nozzle size, and adjusting suitable volume flow rate. The smallest average diameter of breakup droplets for 35 wt. % concentration H2O2 solution reached 92.8 μm under optimum operation conditions. The H2O2 concentration significantly influenced the breakup performance owing to the concentration effect on comprehensive physical properties such as density, surface tension, viscosity, and permittivity. The average diameters of breakup droplets decreased with decreasing H2O2 concentration. At 8 wt. % concentration, the average breakup droplet diameter was reduced to 67.4 μm. Finally, electrostatic atomization mechanism of H2O2 solution was analyzed by calculating dimensionless parameters of Re, We, and Oh numbers with the combination of the operation conditions and physical properties for in-depth understanding the breakup behaviors. The calculation showed that the minimum average diameter of breakup droplets was obtained at 8 wt. % concentration at the investigated range of H2O2 concentration, which kept in agreement with the experimental results.

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“…Kannaiyan et al , reported that nanoparticles as fuel additives have a strong effect on the fuel properties and spray performance of aviation turbine fuel. In our previous studies, , the effects of electric field intensity, volume flow, nozzle size, and particle concentration on electrostatic breakup performance of the nanofluid fuels have been demonstrated. It revealed that particle concentration has a significant effect on physical parameters under the optimum electric field, volume flow, and nozzle size conditions, resulting in large differences of atomization characteristics.…”

Section: Introductionmentioning

confidence: 99%

Dispersion Stability, Physical Properties, and Electrostatic Breakup of Surfactant-Loaded Aluminum/n-Decane Nanofluid Fuel: Nanoparticle Size Effect

Zhu

et al. 2019

Energy Fuels

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The n-decane fuel/n-decane-based nanofluid fuel could be one of the most promising alternative fuels as aviation kerosene for aerospace application. This paper proposes Al/n-decane nanofluid fuel with the surfactant of sorbitan monooleate (SP-80) and investigates the size effect of Al nanoparticle (SA, 56.0 nm; SB, 74.4 nm,; SC, 93.4 nm) on its dispersion stability, physical properties, and electrostatic breakup performance. Dynamic light scattering (DLS) measurements and numerical calculations of particle collision demonstrate that the nanofluid fuel containing SC has the lowest agglomeration and the best stability. The addition of Al nanoparticles slightly influences the physical properties of surfactant-loaded n-decane. At the same Al nanoparticle concentration, the surface tension of the nanofluid fuels reduces at elevated Al nanoparticle size, while the viscosity increases. In a strong electric field, Al nanoparticle size presents a nonmonotonic effect on the average breakup droplet diameter. The force analysis and characteristic dimensionless parameter evaluation demonstrate that it has a synergetic effect with the electrification on electrostatic breakup of the nanofluid fuels. The nanofluid fuel containing SC achieves the smallest average breakup droplet diameter of 56.7 μm, which is much finer than that of surfactant-loaded base fluid. Therefore, the electrostatic breakup performance of the nanofluid fuels depends on the comprehensive effect of nanoparticle size on dispersion stability, physical properties, and electrification.

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Synergetic effects of nanoparticle concentration and electrification on the breakup performance of nanofluid fuel

Cited by 10 publications

References 41 publications

Effect of Nanoparticle Concentration on Physical and Heat-Transfer Properties and Evaporation Characteristics of Graphite/n-Decane Nanofluid Fuels

Effect of Nanoparticle Concentration on Physical and Heat-Transfer Properties and Evaporation Characteristics of Graphite/n-Decane Nanofluid Fuels

Atomization Characteristics of Hydrogen Peroxide Solutions in Electrostatic Field

Dispersion Stability, Physical Properties, and Electrostatic Breakup of Surfactant-Loaded Aluminum/n-Decane Nanofluid Fuel: Nanoparticle Size Effect

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