Observation of Micro-Explosions in Spray Flames of Light Oil-Water Emulsions.

Mizutani, Yukio; Fuchihata, Manabu; Matsuoka, Yoshio; Muraoka, Masaaki

doi:10.1299/kikaib.66.646_1544

Cited by 13 publications

(3 citation statements)

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“…"Glowing spots," which were suggested to be caused by micro-explosion were observed in the burning emulsified fuel spray. Similar phenomena were observed in other studies (Mizutani, et al, 2000;Fuchihata, et al, 2003). Huo et al (2014) observed "bright spots" or "scattered spots" of high luminosity around the central lift-off region in an emulsified diesel spray flame.…”

Section: Introductionsupporting

confidence: 89%

“…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%

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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: Introductionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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

Watanabe

Shoji

Yamagaki

et al. 2014

JTST

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“…Water-emulsified fuel lowers flame temperature, leading to NO x reduction; furthermore, it reduces PM emissions [1][2][3][4][5]. One reason of the reduction in PM is micro-explosion [6][7][8], the rapid boiling of water introduced into the flame by high temperature.…”

Section: Simultaneouslymentioning

confidence: 99%

Improvement of Emissions and Burning Limits in Burner Combustion using an Injector on the Concept of Fuel-water Internally Rapid Mixing

Yatsufusa¹,

Kidoguchi²,

Nakagawa³

2014

JEPE

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Abstract:This study tried to apply biomass fuel to clean burner combustion under high load conditions by water addition. A newly developed injector mixes fuel rapidly with water inside of the injector with support of atomizing air. The mixture composed of three-fluid is injected as spray into a flame stabilizer of burner. Investigation of emission performance of this injector shows that the internally rapid mixing type of injector is hopeful technique to introduce water into burner combustion. Combustion by this injector emits exceedingly less particulate matters at high load. NO x emission is strongly dependent on water flow rate.

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The role of water-in-diesel emulsion and its additives on diesel engine performance and emission levels: A retrospective review

Vellaiyan

Amirthagadeswaran²

2016

Alexandria Engineering Journal

129

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Observation of Micro-Explosions in Spray Flames of Light Oil-Water Emulsions.

Cited by 13 publications

References 0 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

Improvement of Emissions and Burning Limits in Burner Combustion using an Injector on the Concept of Fuel-water Internally Rapid Mixing

The role of water-in-diesel emulsion and its additives on diesel engine performance and emission levels: A retrospective review

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