Autoignition and combustion characteristics of heptane droplets with the addition of aluminium nanoparticles at elevated temperatures

Javed, Irfan; Baek, Seung Wook; Waheed, Khalid

doi:10.1016/j.combustflame.2014.07.015

Cited by 100 publications

(38 citation statements)

References 31 publications

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“…After a certain time, the droplet was observed to distort during the combustion process. However, by using our code, the diameter of the irregular‐shaped droplet could be calculated with reasonable accuracy …”

Section: Experimental Methodsmentioning

confidence: 98%

“…A MATLAB® image‐processing code was developed to determine the circular cross‐section area and diameter of the droplet from the shadow images . A threshold value was set to count the number of pixels within the droplet zone to estimate the cross‐sectional area from which the droplet diameter was calculated.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…During this burning stage, all the droplets undergo diffusion‐controlled combustion wherein the burn rate is controlled by the rate of mixing between fuel vapor and air . The linear burn rate of the droplet was calculated using the D 2 law, given by

D^{2} = D_{o}^{2} - italickt

where, k is the burn‐rate constant, D is the droplet diameter, D o is the initial droplet diameter, and t is the duration between D o and D . Other studies have also used the D 2 law equation to calculate the droplet burn rate from their droplet‐combustion experiment …”

Section: Experimental Methodsmentioning

confidence: 99%

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Improving combustion characteristics of diesel and biodiesel droplets by graphite oxide addition for diesel engine applications

et al. 2017

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Summary Graphite oxide (GO) is an important member of the graphene family of carbon nanomaterials with remarkable physical, chemical, and thermal properties. We conducted an experimental investigation on the combustion characteristics of diesel and biodiesel droplets dosed with 0.1% GO. The fuels were tested by a single droplet combustion experiment in which the temporal variation in the burning behavior of a suspended droplet was captured using a high‐speed camera. Numerical analysis of the combustion data suggests that the addition of GO in both fuels resulted in shortened ignition delay (by up to 38.2%), increased burn‐rate constant (by up to 29.4%), lowered peak temperature (by up to 7.8%), and shortened burning period (by up to 11.6%). To illustrate, the burn‐rate constant increased from 0.68 to 0.88 mm2/second, and the burning period reduced from 2.7 to 2.2 seconds when GO was dosed in diesel. By contrast, the ignition delay and peak temperature both decreased from 1.6 to 1.4 seconds and 659 to 611 K, respectively, when GO was added in biodiesel. Our results suggest that the fuel additive–induced benefits could effectively reduce emissions and improve fuel consumption for diesel engine applications.

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Section: Experimental Methodsmentioning

confidence: 98%

Section: Experimental Methodsmentioning

confidence: 99%

D^{2} = D_{o}^{2} - italickt

Section: Experimental Methodsmentioning

confidence: 99%

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Improving combustion characteristics of diesel and biodiesel droplets by graphite oxide addition for diesel engine applications

et al. 2017

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“…Researchers reported enhancements of combustion performance as well as emission characteristics. Possible mechanisms are catalytic processes at the nanoparticle surface as well as increased evaporation rates due to radiation absorption by the particles [83][84][85][86][87][88][89][90][91][92][93][94]. Kao et al as well as Sarkar and Hirani suggested the addition of nanoparticles to brake fluids to improve thermal transport of dissipated braking energy and increase the boiling point to avoid vapor lock [95,96].…”

Section: Automotive Sectormentioning

confidence: 99%

Nanofluids revisited

Eggers

Kabelac

2016

Applied Thermal Engineering

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h i g h l i g h t s Thermophysical properties bring nanofluids into various engineering applications. Quantity of variable parameters hinder comprehensive equations, e.g. for viscosity. Coordinated research can help to overcome debates about thermophysical properties. Missing experience for nanofluids in large scale plants. Lack of studies about high pressure/temperature applications and long term behavior. a b s t r a c tIn the roughly two decades from the first publication until today, nanofluids have found their way into various research fields. To-date published documents range from basic research to high-tech applications. This contribution aims at outlining current fields of research regarding nanofluid research. These range from fundamental property data studies presented in the first section to a listing of numerous applications of different fields of engineering. It is shown that nanofluid science pushes increasingly into the scientific world providing plenty of new questions and challenges.

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“…이 반죽을 기저 연료에 Table 2. Thermalphysical properties of base fuel at standard atmosphere [10] n-heptane Density (g/mL) 0.680…”

Section: 나노유체 연료unclassified

Experimental Study on Evaporation and Combustion Characteristics of Fuel Droplet with Carbon Nano-Particles in RCM

Ahn¹,

Jyoti²,

Baek³

2016

Journal of the Korean Society of Combustion

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Evaporation and combustion characteristics of fuel droplet with carbon nanoparticle were investigated in a rapid compression machine(RCM). RCM is an experimental equipment to simulate one compression stroke of reciprocating engine. Nitrogen was charged into reaction chamber for evaporation experiment, while oxygen was charged for combustion experiment. N990 carbon black and n-heptane were used to synthesize the carbon nanofluids. Surfactant, span80, was used to make synthesis easier. The droplet pictures were taken using a high speed camera with 500 frames per second. Thermocouple, of which tip is 50 µm, was used not only to measure transient bulk temperature, but also to suspend the droplet. Reaction chamber temperature was calculated from pressure data. The evaporation rate of nanofluids was improved compared to pure fuel. The ignition delay was promoted due to the nanoparticle, but the burning rate was decreased.

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Autoignition and combustion characteristics of heptane droplets with the addition of aluminium nanoparticles at elevated temperatures

Cited by 100 publications

References 31 publications

Improving combustion characteristics of diesel and biodiesel droplets by graphite oxide addition for diesel engine applications

Improving combustion characteristics of diesel and biodiesel droplets by graphite oxide addition for diesel engine applications

Nanofluids revisited

Experimental Study on Evaporation and Combustion Characteristics of Fuel Droplet with Carbon Nano-Particles in RCM

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