Effect of Dispersed Water Droplet Size in Microexplosion Phenomenon Forwater in Oil Emulsion

Mura, Ernesto; Josset, Christophe; Loubar, Khaled; Huchet, Guillaume; Bellettre, Jérôme

doi:10.1615/atomizspr.v20.i9.40

Cited by 90 publications

(35 citation statements)

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“…The assessment of the puffing and micro-explosion occurrence is conducted under selected test conditions keeping fixed the hot plate temperature at 365°C and atmospheric pressure. This temperature was found as a proper value to ensure the Leidenfrost effect occurrence (emulsified droplet lifted) avoiding the quick warm-ups and vaporization, in agreement with previous experiments developed by Mura et al [33] and Tarlet et al [13,15]. The test conditions are shown in Table 1.…”

Section: Experimental Set-up and Proceduressupporting

confidence: 87%

“…ERO12, not shown here du to lake of place). An average water droplet size of 5 µm is seen as an adequate size for a good micro-explosion as shown by Mura et al [33] and Tarlet et al [13,15]. However, micro-explosion phenomenon might occur also for smaller or bigger droplets size, although it may be more or less strong according to Tarlet et al [15].…”

Section: Resultsmentioning

confidence: 87%

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Experimental investigation on puffing and micro-explosion occurrence of water in rapeseed oil emulsions droplets. Effect of the surfactant concentration.

Melo-Espinosa

Bellettre

Tarlet

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

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In this paper, the assessment of puffing and micro-explosion occurrence in emulsion drops with different water percentage is studied. The emulsified fuels are formulated using micro channel emulsifier, rapeseed oil and diesel fuel as continuous phase, as well as water and Sorbitan Sesquioleate as surfactant. The formulated dispersed systems are covered under different experimental factors such as water ratio and surfactant percentage. The puffing occurrence is reported in all emulsified fuels tested (i.e. with and without surfactant). A sudden puffing and highest number of occurrence is noted when the water amount increases in all emulsified fuels. The micro-explosion phenomenon is only noted in emulsified fuel formulated without surfactant.

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Section: Experimental Set-up and Proceduressupporting

confidence: 87%

Section: Resultsmentioning

confidence: 87%

Experimental investigation on puffing and micro-explosion occurrence of water in rapeseed oil emulsions droplets. Effect of the surfactant concentration.

Melo-Espinosa

Bellettre

Tarlet

et al. 2017

Proceedings ILASS–Europe 2017. 28th Conference on Liquid Atomization and Spray Systems

Self Cite

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“…Both phenomena lead to better atomization and intensified mixing of the fuel with the air inside combustion chamber [17]. Number of studies of droplet micro-explosion show that the size and distribution of emulsion water droplets inside the parent diesel droplet has a great impact on micro-explosion [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Fuel-Water emulsion impact on miniature gas turbine pollutant emission

2019

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The innovative use of the Fuel-Water emulsion in a small gas turbine for distributed energy generation is proposed. The FWE in this situation is considered as a nonhomogeneous mix of water and fuel, where water is a dispersed phase in the continuous fuel phase with an addition of surfactants. The Fuel-Water emulsion has a great mainly due to two mechanisms: temperature reduction due to heat absorption by the water phase and enhanced homogeneity of the fuel-air mixture due to micro-explosion of the superheated water phase inside the emulsion droplet. Proposed paper presents theoretical background on Fuel-Water emulsion combustion mechanism. Finally initial results of numerical research of fuel-water emulsion injection to miniature gas turbine are presented. Theoretical predictions of NOX pollutant emissions are compared with accuracy of the gas analyzer planned to be used during experimental research.

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“…For the sake of a less polluted environment and the necessity of enhancing efficient consumption of energy, alternative fuels have to be developed and their combustion has to be improved. Some studies [1][2][3][4][5] show that the presence of a low fraction of finely dispersed water (droplets of the order of 5 to 10 µm) in the fuel lowers the combustion temperature and thus reduces emissions of polluting gasses and particles matters resulted from poor combustion. In this objective, the use of water as a dispersed phase in liquid biofuels is commonly promoted.…”

Section: Introductionmentioning

confidence: 99%

Biofuel Emulsifier Using High-Velocity Impinging Flows and Singularities in Microchannels

Belkadi

Montillet

Bellettre

2017

Journal of Energy Resources Technology

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The objective of this experimental work is to design an original microfluidic mixer for continuous emulsification of small fractions of water in a lipid phase. This system is aimed to be integrated on-line in the process so as to avoid the use of a surfactant. The currently targeted application is a better combustion of water-supplemented alternative biofuels in boilers, turbines, or internal combustion engines in general. Therefore, mean size of droplets of water in the emulsion should be 5–10 μm, and the water content should not exceed ∼20%. Microsystems developed in this work are designed so as to enhance different flow perturbations that are favorable for the emulsification process. The microchannels for the fluids admittance have different sections: 300 × 300 μm2 and 600 × 600 μm2. As a consequence, an impinging flow is developed at the crossing of the inlet microchannels of the two phases which has for effect a significant stretching of the fluids. Then, depending on the continuous phase, Rayleigh instabilities can be developed in the straight parts of the outlet channels (600 × 600 μm2) and/or the enhancement of fluid splitting is obtained; thanks to a singularity (bend) located in the same outlet channels. Two different continuous phases are tested (gasoil and sun flower oil) for which the flow rate is about (65–100 ml/min). The water fraction is varied in the range 7–24%. It is shown that the length of the outlet microchannels is a crucial parameter. Considering an oil phase with low viscosity, such as gasoil, a too long channel can promote coalescence. On the opposite, longer outlet channels are needed with more viscous fluids (like sunflower oil) in order to develop Rayleigh instabilities which is, in this case, the more efficient way to obtain emulsions in this kind of microsystem. On a general point of view, concerning the size of the water droplets, dispersion of water is much more efficient with this microsystem using gasoil rather than vegetable oil as the continuous phase. Considering the targeted application, emulsions with an average size of water droplets of about 10 μm were obtained with gasoil as the continuous phase.

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Effect of Dispersed Water Droplet Size in Microexplosion Phenomenon Forwater in Oil Emulsion

Abstract: International audienc

Cited by 90 publications

References 0 publications

Experimental investigation on puffing and micro-explosion occurrence of water in rapeseed oil emulsions droplets. Effect of the surfactant concentration.

Experimental investigation on puffing and micro-explosion occurrence of water in rapeseed oil emulsions droplets. Effect of the surfactant concentration.

Fuel-Water emulsion impact on miniature gas turbine pollutant emission

Biofuel Emulsifier Using High-Velocity Impinging Flows and Singularities in Microchannels

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