Optical studies of spray development and combustion of water-in-diesel emulsion and microemulsion fuels

Ochoterena, Raul Lima; Lif, Anna; Nydén, Magnus; Andersson, Simon; Denbratt, Ingemar

doi:10.1016/j.fuel.2009.06.039

Cited by 101 publications

(52 citation statements)

References 11 publications

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“…However, the frequency of occurrence of bright spots was nearly negligible in the flame of n-dodecane. Previous studies reported "glowing spots" or "bright spots" in the burning flame of the emulsified fuel (Ochoterena, et al, 2010;Huo, et al, 2014). As previously mentioned, secondary atomization is an acceptable explanation for these bright spots.…”

Section: Experiments 21 Preparation Of the Emulsified Fuelmentioning

confidence: 68%

“…Even though the size difference affects the droplet heating rate and the waiting time for the observation of secondary atomization, the issue of whether secondary atomization information obtained in large droplet experiments are applicable to spray flow is not well understood. Recently, secondary atomization in spray flow has been extensively studied (Mizutani, et al, 2000;Fuchihata, et al, 2003;Ochoterena, et al, 2010;Watanabe, et al, 2013;Huo, et al, 2014). Ochoterena et al (2010) studied spray development and combustion by optical methods in an optically accessed combustion vessel under conditions similar in a diesel engine.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, secondary atomization in spray flow has been extensively studied (Mizutani, et al, 2000;Fuchihata, et al, 2003;Ochoterena, et al, 2010;Watanabe, et al, 2013;Huo, et al, 2014). Ochoterena et al (2010) studied spray development and combustion by optical methods in an optically accessed combustion vessel under conditions similar in a diesel engine. "Glowing spots," which were suggested to be caused by micro-explosion were observed in the burning emulsified fuel spray.…”

Section: Introductionmentioning

confidence: 99%

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Observation of droplet behavior of emulsified fuel in secondary atomization in flame

Watanabe

Shoji

Yamagaki

et al. 2014

JTST

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The study aims to visualize droplet behaviors of emulsified fuel in secondary atomization in a flame stabilized in a laminar counterflow field. To study secondary atomization characteristics in the flame, direct photography of the flame using a color high-speed video camera (7,000 fps) and magnified shadow imaging of spray droplets using a monochrome high-speed video camera (180,064 fps) were used. Frequencies of secondary atomization in the flame were also discussed. As a result, "bright spots," which were of similar or higher luminosity than the surrounding area were observed by direct photography around the luminous flame of the emulsified fuel, whereas the frequency of occurrence of "bright spots" was almost negligible when n-dodecane was used. Observations indicated that the droplet flame rapidly expanded. This expansion was linked to secondary atomization phenomena such as puffing (i.e., vapor eruption from the droplet surface), partial micro-explosion (i.e., where a large portion of a droplet bursts), and micro-explosion (i.e., where the entire droplet bursts), which were visualized in the flame by magnified shadow imaging. It was suggested that secondary atomization caused rapid evaporation and spread of fuel vapor. The magnified shadow imaging technique provided a clear description of droplet behavior in the flame. Numerous puffing and micro-explosion were observed regardless of the flame emissions. In addition, it was observed that vapor blowout in secondary atomization accelerated droplet velocity, and led to the random movement of spray droplet. It was shown that the frequencies of secondary atomization increased in the downstream region where the luminous flame was formed. Secondary atomization occurred in droplets of various sizes in the downstream region, whereas it occurred in only small droplets in the upstream region where the luminous flame was not formed.

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Section: Experiments 21 Preparation Of the Emulsified Fuelmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Observation of droplet behavior of emulsified fuel in secondary atomization in flame

Watanabe

Shoji

Yamagaki

et al. 2014

JTST

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“…Whilst engine testing of emulsified fuels is widely published, fundamental spray experiments are rare. The work [30] is partially concerned with the spray parameters of Diesel fuel emulsions. An emulsion containing 10% water is injected into a constant volume combustion chamber, under reactive, vaporizing conditions (air at 830 K), with the cone angle measured at 42 and 112 nozzle diameters downstream of the nozzle.…”

Section: Characterization Of Fuel Spraysmentioning

confidence: 99%

Optical characterization of Diesel and water emulsion fuel injection sprays using shadowgraphy

Emberson

Ihracska

Imran

et al. 2016

Fuel

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h i g h l i g h t sFuel injection sprays have been examined using a focused shadowgraph system. Diesel and Diesel and water emulsions containing 10% and 20% water examined. Temporal evolution of the spray cone angle and tip penetration have been measured. Emulsification reduced the cone angle at injection pressure of 500 bar. Emulsification had no discernable influence on the tip penetration. t r a c tDiesel fuel and water emulsions have been shown to reduce emissions of NO x and PM from compression ignition engines. There is a lack of work examining the influence of emulsification on the sprays formed during injection. This work examines the spray cone angle and tip penetration of Diesel fuel and water emulsions, containing 10% and 20% water (by mass). All experiments were conducted under nonreacting, non-vaporizing conditions in a constant volume pressure chamber filled with nitrogen. A focused shadowgraph system, with high speed photography, coupled with a research, high current LED system was used. Differences in the spray cone angle suggest the emulsification did have an effect for the injections at a pressure of 500 bar. Emulsification had no discernible effect on the spray tip penetration. Spray tip penetration showed agreement with previous trends in terms of proportionality to time after start of injection however agreement with models found in the literature was not consistent.

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“…The necessity of reducing gas emissions and improving the performance of engines has increased the interest in microemulsified systems as alternative fuels (Castro Dantas et al, 2001b;Ochoterena et al, 2010;Lif et al, 2010;Dantas Neto et al, 2011).…”

Section: Microemulsion As Alternative Fuelmentioning

confidence: 99%

The Use of Microemusion Systems in Oil Industry

Santanna¹,

Dantas²,

Neto³

2012

Microemulsions - An Introduction to Properties and Applications

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Optical studies of spray development and combustion of water-in-diesel emulsion and microemulsion fuels

Cited by 101 publications

References 11 publications

Observation of droplet behavior of emulsified fuel in secondary atomization in flame

Observation of droplet behavior of emulsified fuel in secondary atomization in flame

Optical characterization of Diesel and water emulsion fuel injection sprays using shadowgraphy

The Use of Microemusion Systems in Oil Industry

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