Experimental investigation and modeling of the evaporation rate of carbon nanotube blended emulsified Neem biodiesel

Khond, Vivek W.; Kriplani, V. M.

doi:10.1080/17597269.2017.1323322

Cited by 18 publications

(7 citation statements)

References 15 publications

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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%

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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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Section: Introductionmentioning

confidence: 99%

“…Addition of nanomaterials to liquid fuels alters the heat transfer to/from the droplet, which influences the droplet evaporation rate, see for example [3][4][5][26][27][28]. Results of Tanvir et al [5] suggest that the circulatory flow inside the droplet accumulates the nanomaterials at the droplet surface, creating a porous shell.…”

Section: Introductionmentioning

confidence: 99%

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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“…However, the urea solution required for this technology is hazardous and costly. [9][10][11] The water emulsion technology also one method to reduce the NOx emission [12][13][14][15]. In previous studies, Ammonia is used in place of urea.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of SCR System for Nox Reduction Using Waste Urea Based Organic Fluid

Jibhkate¹,

Khond²,

Kadu³

et al. 2020

IJIES

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Present study investigated the Selective catalytic reduction exhaust after treatment technology in CI engine to control the NOx reduction. In this study the urea solution are replaced by other waste urea content material. Also some metal oxides are used to reduce the pollution from CI engines. It was observed that low cost natural waste product based SCR solution shows very good capability to reduce emission of diesel engine.

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“…The evaporation rate of fuel plays a crucial role in combustion. An improvement in evaporation rate was achieved by doping nanoparticles in Neem biodiesel . The ignition delay was lowered from 1.6 to 1.4 seconds, whereas the peak temperature was brought down from 659 to 611 K with the addition of graphene oxide in palm biodiesel.…”

Section: Introductionmentioning

confidence: 99%

“…An improvement in evaporation rate was achieved by doping nanoparticles in Neem biodiesel. 28 The ignition delay was lowered from 1.6 to 1.4 seconds, whereas the peak temperature was brought down from 659 to 611 K with the addition of graphene oxide in palm biodiesel. The doping of nanoadditives in neat biodiesel reduces the exhaust emissions and also improve the performance parameters.…”

Section: Introductionmentioning

confidence: 99%

Influence of nanoadditives on ignition characteristics of Kusum ( Schleichera oleosa ) biodiesel

Kumar

Tomar

2019

Int J Energy Res

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Summary Biodiesel obtained from inedible sources emerged as a productive approach in Indian energy scenario due to the scarcity of food resources come up with extensive usage of edible crops. Kusum (Schleichera oleosa) oil is abundantly available in India and can be used as feedstock to produce biodiesel. However, issues such as higher viscosity, poor stability, and lower calorific value result in poor ignition characteristics, hence limiting its use in combustion applications. An improvement in performance and emission characteristics can be achieved by doping nanoparticles in Kusum biodiesel (KBD). The present work examines the impact of a metal compound and carbon‐primarily based nanoparticles on the evaporation time and ignition probability of the KBD. During the experimental process, different fuel samples of KBD were prepared by amalgamating nanoparticles; then, a sequence of hot plate (stainless steel) ignition test was conducted on these test fuels. The comparative assessment of neat biodiesel and the biodiesel fuel doped with 30 ppm each of alumina (Al2O3), and multiwalled carbon nanotubes (MWCNTs) nanoparticles were carried out. The Kusum oil was converted to biodiesel using two‐stage transesterification process. In the initial stage, refined oil was gone through the acid catalyst esterification process followed by the transesterification reaction. The prepared methyl ester was confirmed and characterized using GC‐MS technique. The thermophysical and spray properties of the test fuels including density, viscosity, calorific value, cloud/pour point, Sauter mean diameter (SMD), and specific surface area (SSA) were also calculated. The experimental result showed a significant increase in ignition probability and heat conduction properties due to improved surface area/volume ratio. Also, lower evaporation time was noted for metal/carbon‐based nanoparticles doped biodiesel as compared with neat biodiesel.

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Experimental investigation and modeling of the evaporation rate of carbon nanotube blended emulsified Neem biodiesel

Cited by 18 publications

References 15 publications

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

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

Experimental Investigation of SCR System for Nox Reduction Using Waste Urea Based Organic Fluid

Influence of nanoadditives on ignition characteristics of Kusum ( Schleichera oleosa ) biodiesel

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