Effect of gravity on onset of microexplosion for an oil-in-water emulsion droplet

Tsue, Mitsuhiro; Yamasaki, Hiroshi; Kadota, Toshikazu; Segawa, Daisuke; Kono, Michikata

doi:10.1016/s0082-0784(98)80112-4

Cited by 26 publications

(11 citation statements)

References 12 publications

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“…Reply. The present results, including the phase separation and the statistical characteristics of microexplosion hold for a suspended droplet burning in gaseous environments ( [25][26][27] in paper]. d Mani Pourouchottamane.…”

Section: Commentsmentioning

confidence: 70%

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Microexplosion of an emulsion droplet during Leidenfrost burning

Kadota

Tanaka

Segawa

et al. 2007

Proceedings of the Combustion Institute

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Section: Commentsmentioning

confidence: 70%

“…The coefficients A and K are 1.01 · 10 4 [K] and 6.0 · 10 19 [(sAEm 3 ) À1 ]. Equation (3) has the same form as the equation for the rate of microexplosion for an emulsion droplet burning in air under normal gravity [26] and under microgravity [27].…”

Section: Resultsmentioning

confidence: 99%

Microexplosion of an emulsion droplet during Leidenfrost burning

Kadota

Tanaka

Segawa

et al. 2007

Proceedings of the Combustion Institute

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“…Because the type of surfactant is the only difference between the WD and DW emulsions, especially with the volume fractions of the constituents are the same. The effect of surfactant weakens with the increase of the emulsion temperature [21]. Therefore, water/diesel separation, and in turn, water coagulation in the centre of the droplet will take place making the droplet to burn in a single-component-like mode rather than multicomponent combustion.…”

Section: Resultsmentioning

confidence: 99%

“…Tsue et. al., [21] have imputed the microexplosion occurrence to the formation of water vapour bubbles inside the burning droplets of n-dodecane-in-water and n-tetradecane-in-water emulsions. Wang et.…”

Section: Introductionmentioning

confidence: 99%

Multicomponent fuel droplet combustion investigation using magnified high speed backlighting and shadowgraph imaging

Faik

Yang

2018

Fuel

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The liquid-phase processes occurring during fuel droplet combustion are important in deciding the behaviour of the overall combustion process, especially, for the multicomponent fuel droplets. Hence, understanding these processes is essential for explaining the combustion of the multicomponent fuel droplet. However, the very fast combustion of the too small fuel droplet makes experimental investigation of these processes uneasily affordable. In the present work, a high speed backlighting and shadowgraph imaging of the multicomponent fuel droplet combustion including liquid-phase dynamics are performed. Two categories of multicomponent fuelsin which diesel is the base fuelare prepared and utilized. The first category is biodiesel/diesel and bioethanol/diesel blends, while the second category is the water-in-diesel and diesel-in-water emulsions. Specific optical setups are developed and used for tracking droplet combustion. The first setup is associated with the backlighting imaging with the resulting magnification of the droplet images being 30 times the real size. The second optical setup is used for shadowgraph imaging, with the resulting magnification being 10 times the real size. Using these setups, spatial and temporal tracking of nucleation, bubble generation, internal circulation, puffing, microexplosion, and secondary atomization during the combustion of isolated multicomponent fuel droplets are performed. Spatial and temporal tracking of the sub-droplets generated by secondary atomization, and their subsequent combustion, in addition to their overall lifetimes have also been performed. Accordingly, a comparison of the burning rate constant between the parent droplet and the resulting sub-droplets is carried out. The rate of droplet secondary atomization is higher than those obtained by relatively low imaging rate. Additionally, it is shown that during a large portion of its entire lifetime, the droplet geometry has been affected by combustion significantly.

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“…The experimental results demonstrated that increasing pressure not only enhanced the possibility of micro-explosion of an otherwise non-explosive mixture, but also advanced the instant of its occurrence during the drop lifetime. Tsue et al (1998) investigated the effects of gravity on the occurrence of micro-explosion by the free-fall method. Assuming micro-explosion to be a random process, they discussed the onset probability of microexplosion from the statistical point of view.…”

Section: Introductionmentioning

confidence: 99%

Micro-explosion of a water-in-hexadecane compound drop

Hsieh

Chen

et al. 2012

Journal of the Chinese Institute of Engineers

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The micro-explosion of a water-in-oil compound drop, without emulsification, was investigated experimentally. The compound drop, composed of a water core encased by an n-hexadecane shell, was suspended and heated to micro-explosion. The heating process and the micro-explosion behavior were recorded by a high-speed video system, and the temperature history of the compound drop was measured under three ambient temperatures, namely 320 C, 400 C and 500 C. The behaviors of the micro-explosion were grouped into three modes, namely direct explosion, partial explosion, and swelling, according to the outcomes of micro-explosion recorded by the high-speed video camera. At an ambient temperature of 400 C or 500 C, the micro-explosion onset time was observed to increase with the micro-explosion temperature; but this trend was not as obvious for the ambient temperature of 320 C. The intensity, judged from the production of secondary drops, of the micro-explosion rose as the micro-explosion time lengthened because the accumulation of thermal energy within the oversaturated water core drop grew to a higher extent.

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Effect of gravity on onset of microexplosion for an oil-in-water emulsion droplet

Cited by 26 publications

References 12 publications

Microexplosion of an emulsion droplet during Leidenfrost burning

Microexplosion of an emulsion droplet during Leidenfrost burning

Multicomponent fuel droplet combustion investigation using magnified high speed backlighting and shadowgraph imaging

Micro-explosion of a water-in-hexadecane compound drop

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