Evaporation Rate of Colloidal Droplets of Jet Fuel and Carbon-Based Nanoparticles: Effect of Thermal Conductivity

Aboalhamayie, Ahmed; Festa, Luigi; Ghamari, Mohsen

doi:10.3390/nano9091297

Cited by 23 publications

(7 citation statements)

References 38 publications

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“…In recent years, the optical properties of colloidal suspensions (nanofluids) have been actively studied [ 1 , 2 , 3 , 4 , 5 , 6 ]. Researchers are particularly interested in nonlinear optical effects that are realized in such media.…”

Section: Introductionmentioning

confidence: 99%

Appearance of a Solitary Wave Particle Concentration in Nanofluids under a Light Field

et al. 2021

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In this study, the nonlinear dynamics of nanoparticle concentration in a colloidal suspension (nanofluid) were theoretically studied under the action of a light field with constant intensity by considering concentration convection. The heat and nanoparticle transfer processes that occur in this case are associated with the phenomenon of thermal diffusion, which is considered to be positive in our work. Two exact analytical solutions of a nonlinear Burgers-Huxley-type equation were derived and investigated, one of which was presented in the form of a solitary concentration wave. These solutions were derived considering the dependence of the coefficients of thermal conductivity, viscosity, and absorption of radiation on the nanoparticle concentration in the nanofluid. Furthermore, an expression was obtained for the solitary wave velocity, which depends on the absorption coefficient and intensity of the light wave. Numerical estimates of the concentration wave velocity for a specific nanofluid—water/silver—are given. The results of this study can be useful in the creation of next-generation solar collectors.

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Section: Introductionmentioning

confidence: 99%

Appearance of a Solitary Wave Particle Concentration in Nanofluids under a Light Field

et al. 2021

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“…Combustion characteristics of droplets doped with both carbonaceous and non-carbon-based [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] additives have been investigated in the past. Results of past studies show the addition of nanomaterials to liquid fuels can potentially allow for improving some thermofluidic characteristics, such as thermal conductivity [1][2][3][43][44][45][46][47][48][49][50][51][52][53], which can lead to enhanced evaporation rate [3][4][5][26][27][28] and burning rate [1, 2, 6-12, 25, 29-33]. Past investigations [26, 34-38, 54, 55] show that complex thermofluidic phenomena, specifically atomization, can significantly influence droplet combustion.…”

Section: Introductionmentioning

confidence: 99%

“…and decreasing the size of the nanomaterial particles [52,53] are expected to increase the thermal conductivity. For example, Agarwal et al [56] and Aboalhamayie et al [3] reported that adding 0.2 and 3% by weight of carbon nanotubes and graphene nanoplatelets to jet fuel and kerosene may increase the thermal conductivity by 23% and 29%, respectively. The increase of the thermal conductivity by addition of nanomaterials is due to enhancement of the Brownian motion [43,44] and generation of solid-liquid interface thermal bridge [45][46][47] inside the droplet.…”

Section: Introductionmentioning

confidence: 99%

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Graphene oxide doped ethanol droplet combustion: Ignition delay and contribution of atomization to burning rate

Mosadegh¹,

Ghaffarkhah²,

Kuur³

et al. 2021

Preprint

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Effects of graphene oxide nanomaterials addition and oxidation level on ignition delay and burning rate of ethanol droplets are experimentally investigated. Three graphene oxide samples are synthesized and characterized. Separate high-speed OH * chemiluminescence and high-speed shadowgraphy images are collected. The results suggest that increasing the loading concentration from 0 to 0.1% (by weight) generally increases the ignition delay, except for ethanol doped with the highly oxidized graphene. The results show that unlike pure ethanol droplets, atomization may occur for the doped ethanol droplets.It is demonstrated that, independent of the tested conditions, atomization occurs in the second half of the droplet lifetime. The probability density function of the atomized baby droplet diameter, initial projected velocity, and length of the projected trajectory are similar for all tested conditions and independent of the oxidation level and loading concentration of the additives. The joint probability density function calculated for the atomization-related parameters against one another suggests that the majority of the baby droplets feature a relatively short lifetime, indicating they may potentially burn inside the flame envelope. Using droplet surface regression curves versus time, the burning rate for periods in which the atomization does not occur, and for the periods that the atomization is present are estimated. The former burning rate is shown to enhance by increasing the loading concentration and reducing the oxidation level of graphene. However, supported by Fourier-Transform Infrared spectroscopy of the graphene oxide samples, it is found that a maximum increase in the latter burning rate for both loading concentrations occurs for ethanol doped with the graphene oxide that features maximum amount of infrared radiation absorption. To quantify the effect of atomization on the droplet mass loss, a conservation of mass framework is utilized, and it is shown that relatively intense atomization suppresses the mass loss. Doping ethanol with graphene oxide and increasing the loading concentration from 0.01 to 0.1% enhances the overall burning rate, with a maximum enhancement of 8.4% pertaining to addition of reduced oxidized graphene oxide and for the loading concentration of 0.1%.

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“…MoS 2 nanostructures have good thermo-physical features and great anti-friction properties, making it another promising material as reinforcement for the cooling purposes of nanofluids. Diverse factors such as the composition and loading of nanoparticles, suspension stability, base fluid composition, nanofluids preparation method, surface modifier, and surfactant application may influence the thermo-physical properties of nanofluids, including viscosity and thermal transport [ 50 , 51 , 52 , 53 , 54 , 55 ]. Su et al [ 52 ] investigated stability and thermal transport behavior of MoS 2, water-based, and oil-based nanofluids at various concentrations (0.01 wt.% to 0.5 wt.%).…”

Section: Introductionmentioning

confidence: 99%

Thermal Conductivity Performance of 2D h-BN/MoS2/-Hybrid Nanostructures Used on Natural and Synthetic Esters

et al. 2020

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In this paper, the thermal conductivity behavior of synthetic and natural esters reinforced with 2D nanostructures—single hexagonal boron nitride (h-BN), single molybdenum disulfide (MoS2), and hybrid h-BN/MOS2—were studied and compared to each other. As a basis for the synthesis of nanofluids, three biodegradable insulating lubricants were used: FR3TM and VG-100 were used as natural esters and MIDEL 7131 as a synthetic ester. Two-dimensional nanosheets of h-BN, MoS2, and their hybrid nanofillers (50/50 ratio percent) were incorporated into matrix lubricants without surfactants or additives. Nanofluids were prepared at 0.01, 0.05, 0.10, 0.15, and 0.25 weight percent of filler fraction. The experimental results revealed improvements in thermal conductivity in the range of 20–32% at 323 K with the addition of 2D nanostructures, and a synergistic behavior was observed for the hybrid h-BN/MoS2 nanostructures.

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Evaporation Rate of Colloidal Droplets of Jet Fuel and Carbon-Based Nanoparticles: Effect of Thermal Conductivity

Cited by 23 publications

References 38 publications

Appearance of a Solitary Wave Particle Concentration in Nanofluids under a Light Field

Appearance of a Solitary Wave Particle Concentration in Nanofluids under a Light Field

Graphene oxide doped ethanol droplet combustion: Ignition delay and contribution of atomization to burning rate

Thermal Conductivity Performance of 2D h-BN/MoS2/-Hybrid Nanostructures Used on Natural and Synthetic Esters

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