Experimental investigation of emulsified fuels produced with a micro-channel emulsifier: Puffing and micro-explosion analyses

Melo-Espinosa, Eliezer Ahmed; Bellettre, Jérôme; Tarlet, Dominique; Montillet, Agnès; Piloto‐Rodríguez, Ramón; Verhelst, Sebastian

doi:10.1016/j.fuel.2018.01.103

Cited by 41 publications

(14 citation statements)

References 48 publications

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“…In other words, the bubbles in the W/O emulsion are in the oil phase with relatively low surface tension rather than in the water phase with higher surface tension. This explains why the micro-explosion effect of emulsions prepared with high concentrations of oil-soluble surfactants was not strong in previous studies [15][16][17] .…”

Section: Mechanism For Effect Of Polymer Additive On Micro-explosionmentioning

confidence: 84%

“…[8][9][10][11] Due to the great potential of micro-explosion application, a large number of researchers have sought to understand its mechanism and regular patterns by exploring and observing the micro-explosion phenomenon of single droplets [12][13][14] . It has been found that there are at least two different forms of micro-explosion in single droplet micro-explosion experiments, namely "micro-explosion" and "puff" 12,[15][16][17][18][19][20] . In some studies, these two forms of micro-explosion are also called "optimal micro-explosion" and "non-optimal micro-explosion" respectively 6,7,21,22 .…”

Section: Introductionmentioning

confidence: 99%

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Achieving optimal micro-explosions in stable emulsions by adding water-soluble polymers

Cao

Xiao

Cui³

et al. 2022

Preprint

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The emulsified feedstock technique is to improve the performance of products by using the micro-explosion phenomenon of emulsion. However, an obstacle to some applications of this technology is the contradiction between emulsion stability and micro-explosion intensity. For the first time, adding water-soluble polymers was proposed to solve this problem. Two polymers of xanthan gum (XG) and nonionic polyacrylamide (NPAM) were investigated and the results show that micro-explosions have five forms. As one of these five forms, the intensity of optimal micro-explosion is three orders of magnitude higher than other forms, and adding 0.5% XG increases the probability of optimal micro-explosion from 0% to 60% due to the low surface activity, strong thickening and pseudoplasticity of XG solutions. By contrast, NPAM does not promote micro-explosion because of its strong surface activity. Finally, a new mechanism for micro-explosions related to surface tension, interfacial tension and viscosity is proposed.

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Section: Mechanism For Effect Of Polymer Additive On Micro-explosionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Achieving optimal micro-explosions in stable emulsions by adding water-soluble polymers

Cao

Xiao

Cui³

et al. 2022

Preprint

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show abstract

“…This is in line with the results of research by Melo-Espinosa, Bellettre, and D. Tarlet in 2018 which stated that as the percentage of water content added to the sample increases, the viscosity of the emulsion will also increase. This is because when the percentage of water content increases, a more complex micellar structure will form and will cause viscosity to increase [9]. In addition, the increasing percentage of water content is also due to the hydrodynamic interaction between emulsion particles which causes high internal friction and results in high viscosity values [10].…”

Section: Resultsmentioning

confidence: 99%

The Effect of HLB Surfactant Value on The Characteristics of Emulsion Biodiesel Palm Oil Using Homogenizer

Damayani

Paramita

Yulianto

2021

Journal of Vocational Studies on Applied Research

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The process of making water emulsion in palm oil biodiesel is assisted by using two types of surfactants with different HLB values, namely Tween 80 and Span 80. This study aims to determine the characteristics of palm oil biodiesel emulsion made using a homogenizer with different HLB values, surfactant composition and water content in each sample. Density, viscosity, stability and microscopy tests were carried out to determine the characteristics of palm oil biodiesel emulsion. The results were obtained in the form of the highest density and viscosity values found in samples with high HLB values, surfactant composition and water content, while for stability test results were found in samples with low HLB values, surfactant composition and low water content. This shows that the difference in the value of HLB used will affect the amount of surfactant composition and moisture content in the sample composition and will affect the density, viscosity and stability of the palm oil biodiesel emulsion formed.

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“…The surfactant that showed the best results was polyglyceryl-4-oleate, concluding that it could be used in real diesel engines. Melo-Espinoza et al [13] performed an experimental study correlating diesel emulsion droplet size, water droplet size and its relationship with the occurrence of puffing and microexplosion phenomena. These problems were studied using the surfactant sorbitan sesquioleate.…”

Section: Introductionmentioning

confidence: 99%

Analysis and performance assessment of the use of ammonia-based nano additive for lean combustion

Gloria

Strafella

Giorgi

et al. 2022

J. Phys.: Conf. Ser.

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In recent years, considerable progress has been made in exploring new applications of fuel additives to reduce emissions. Reduction of total nitrogen oxide (NOx) emissions can be achieved by decreasing the flame temperature by using fuel emulsified with water and/or using ammonia-based nano additives such as urea. The use of water as part of the hydrocarbon fuel is also one of the prospective directions in the development of new types of fuel systems. For the preparation of emulsified fuel, it is desirable to achieve greater stability of the emulsified fuel with minimum expenditure of chemicals and energy, so that the emulsified fuel can be used for a longer period. The paper analyzed the influence of nano-dispersed urea particles, water, and surfactant (Span 80/Tween 80) on the combustion stability and emission characteristics of aviation fuel. The experimental campaign was conducted on a test stand (a 300kW liquid vortex combustor of 300 kW) consisting of a cylindrical combustion chamber with four optical windows and equipped with high-precision pressure sensors, thermocouples, and an exhaust gas analyzer for acquiring emissions. The experimental campaign was conducted at a constant fuel/air ratio (Φ). One of the main focus is related to the stability of the emulsion. Chemiluminescence imaging was performed to characterize the effects of the additive on flame emissions. In addition, a statistical and spectral analysis was performed using the pressure sensor for instability analysis. Exhaust gas analysis was performed both with the additive described above and without additive for a constant Φ condition. The analysis was performed for NOx, carbon monoxide (CO) and carbon dioxide (CO2) and oxygen (O2).

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Experimental investigation of emulsified fuels produced with a micro-channel emulsifier: Puffing and micro-explosion analyses

Cited by 41 publications

References 48 publications

Achieving optimal micro-explosions in stable emulsions by adding water-soluble polymers

Achieving optimal micro-explosions in stable emulsions by adding water-soluble polymers

The Effect of HLB Surfactant Value on The Characteristics of Emulsion Biodiesel Palm Oil Using Homogenizer

Analysis and performance assessment of the use of ammonia-based nano additive for lean combustion

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