Experimental investigation on the evaporation and micro-explosion mechanism of jatropha vegetable oil (JVO) droplets

Wang, X.R.; Dai, Minglu; Yan, Jun; Chen, Chen; Jiang, Genzhu; Zhang, Jinxin

doi:10.1016/j.fuel.2019.115941

Cited by 21 publications

(8 citation statements)

References 36 publications

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“…On the other hand, previous studies have also used fundamental manner like the suspended single droplet combustion method by utilizing various vegetable oils, including; coconut oil [22], [23], jatropha oil [24], castor oil, sunflower oil, corn oil, palm oil, soybean oil, and glycerol [25], [26]. They found that vegetable oils have two components of carbon chains: fatty acids and glycerol, and they burn at different times, starting with fatty acids and following by glycerol.…”

Section: Introductionmentioning

confidence: 99%

Effects of Eugenol and Cineol Compound on Diffusion Burning Rate Characteristics of Crude Coconut Oil Droplet

Riupassa

Suyatno

Nanlohy

et al. 2023

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The burning rate of coconut oil droplets has been investigated experimentally by adding bio-additives of clove oil and eucalyptus oil. Tests were carried out with single droplets suspended on thermocouples at room atmospheric pressure, and room temperature and ignited with a hot wire. The addition of clove oil and eucalyptus oil as bio-additives into coconut oil was 100 ppm and 300 ppm, respectively. The droplet combustion method was chosen to increase the contact area between the air and fuel so that the reactivity of the fuel molecules increases. The results showed that the eugenol compounds contained in clove oil and cineol compounds in eucalyptus oil were both aromatic, and had an unsymmetrical carbon chain geometry structure. Furthermore, this factor can potentially accelerate the occurrence of effective collisions between fuel molecules. Therefore the fuel is combustible, as evidenced by the increased burning rate, where the results show that without bio-additives, the burning rate of crude coconut oil (CCO) is about 0.7 seconds. These results are 0.15 to 0.2 seconds slower than CCO with bio-additive, which is around 0.55 to 0.6 seconds. Moreover, from the observations, it was found that the highest burning rate was achieved in both bio-additives with a concentration of 300 ppm.

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Section: Introductionmentioning

confidence: 99%

Effects of Eugenol and Cineol Compound on Diffusion Burning Rate Characteristics of Crude Coconut Oil Droplet

Riupassa

Suyatno

Nanlohy

et al. 2023

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“…This is due to the increase in the catalyst mass in the fuel causes the CJO molecules to be more charged, resulting in a potential difference between the CJO molecules and the catalyst molecules, and this causes attractive interactions between atoms. The interaction between the fuel atoms makes the fuel molecules more reactive, so they are flammable and have the potential to facilitate microexplosion, which creates bulge geometry, and suddenly the height of the flame will increase like a needle [25]. As for the flame width (see Figure 4), it can be seen that CJOR 0.02% of the catalyst was achieved, which was around 9.111 mm, DEX was around 7.97 mm, followed by CJOR 0.01% of 6.51 mm, and the smallest flame width was produced by pure CJO about 6.52 mm.…”

Section: Resultsmentioning

confidence: 99%

Comparative Studies on Combustion Characteristics of Blended Crude Jatropha Oil with Magnetic Liquid Catalyst and DEX under Normal Gravity Condition

Nanlohy

2021

JMEST

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A comparative study on the combustion characteristics of a single droplet fueled by DEX, crude jatropha oil (CJO), and a mixture of CJO with a magnetic liquid catalyst of rhodium trisulfate has been carried out under normal gravity conditions. The high viscosity of crude jatropha oil makes it difficult to burn under normal conditions (room temperature and atmospheric pressure), therefore the addition of a magnetic liquid catalyst rhodium trisulfate is needed to improve the properties of crude jatropha oil. As a catalyst, rhodium trisulfate has the potential to improve combustion performance while improving the physical properties of crude jatropha oil as an alternative fuel for the better. Furthermore, performance tests were also carried out with DEX fuel with a cetane number (CNs) 53. The results showed that compared to DEX, it was seen that the liquid metal catalyst rhodium trisulfate succeeded in making crude jatropha oil more charged so that the combustion process was better. This is evidenced by a significant change in the dimensions of the flame and an increase in the combustion temperature. Moreover, it is also seen that the burning rate increases and the ignition delay become faster.

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“…However, pure ethanol droplets do not feature atomization. Past studies, see for example [35,36,54,58], suggest that the difference between the boiling points of molecules inside a multi-component fuel with one another and/or with water (due to potential water vapor condensation for alcohols [100]), the existence of a droplet supporting mechanism, and/or presence of solid particle doping agents can lead to the formation of bubble(s) inside the droplet. Since doping agents are not present for our pure ethanol experiments, and that atomization is not observed for these experiments, it is not expected that the presence of the supporting mechanism or the difference between the boiling points of ethanol and possibly condensed water cause the atomization.…”

Section: Atomization Characterizationmentioning

confidence: 99%

“…Such influences can potentially increase the evaporation rate and as a result the droplet burning rate [1-3, 5-7, 10-12, 54]. Second, existence of nanomaterials leads to formation of bubbles inside the droplet, as a result of nucleation occurring at nanomaterial-liquid interface [2,26,35,36,54,58]. After the bubbles are formed, the gas pressure inside the bubbles rapidly increases due to surface regression of the main droplet, heat transfer from the flame, and/or bubbles coalescence [54].…”

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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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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Experimental investigation on the evaporation and micro-explosion mechanism of jatropha vegetable oil (JVO) droplets

Cited by 21 publications

References 36 publications

Effects of Eugenol and Cineol Compound on Diffusion Burning Rate Characteristics of Crude Coconut Oil Droplet

Effects of Eugenol and Cineol Compound on Diffusion Burning Rate Characteristics of Crude Coconut Oil Droplet

Comparative Studies on Combustion Characteristics of Blended Crude Jatropha Oil with Magnetic Liquid Catalyst and DEX under Normal Gravity Condition

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

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