Experimental Investigation of Microexplosion Occurrence in Water in Diesel Emulsion Droplets during the Leidenfrost Effect

Khan, Mohammed Yahaya; Karim, Zainal Ambri Abdul; Aziz, Abdul; Tan, Isa M.

doi:10.1021/ef501588z

Cited by 56 publications

(19 citation statements)

References 15 publications

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“…Appear the histogram for the emulsions of 5%, 10%, 15%, 20%, and 25% water content. droplets were affected significantly by increasing of water dosage, so the water droplet size was increasing with the increase in water volumetric percentage. This result is in agreement with microscopic result of emulsion for Khan et al (2014). The mean diameter of water dosages: 5%, 10%, 15%, 20% and 25% were 2.2, 3.5, 4.6, 5.2 and 7.7 µm, respectively.…”

Section: The Effect Of Water Dosage On Droplet Size Distributionsupporting

confidence: 91%

Investigation of Water-Diesel Emulsion Characteristics using Optical Technique

Wahhab

Maskour

Madodi

2020

JAFM

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The idea of using water-in-Diesel (W/D) emulsion in recent studies as fuel for diesel engines is to reduce the emissions. The introduction of water into a diesel engine using W/D emulsion has a number of potential benefits and can be used as an alternative fuel. One of important factors to use this fuel was the distribution of water droplets in emulsion and emulsifier stability. In the present work, the effect of emulsifier dosage (water in diesel ratio) and heating of W/D emulsion on the stability period with using optical technique was investigated. Five samples of W/D emulsion at different emulsifier dosages (5%, 10%, 15%, 20%, and 25%) water content were studied, whereas the heating of emulsions was carried out for 40 o C, 60 o C, and 80 o C. The results obtained from the current work manifested that an increase in water dosage to W/D emulsion had bad effects on the stability period, also, the increase in heating temperature for W/D emulsion revealed a negative effect on the emulsion stability.

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Section: The Effect Of Water Dosage On Droplet Size Distributionsupporting

confidence: 91%

Investigation of Water-Diesel Emulsion Characteristics using Optical Technique

Wahhab

Maskour

Madodi

2020

JAFM

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“…Emulsified fuels are considered as one of the conceivable alternative fuels for reducing the engine exhaust emissions (Abu-Zaid, 2004, Armas et al, 2005, Park et al, 2000 Page 17 of 30 Khan et al, 2014). The most noticeable effects of such fuels are the secondary atomization occurring during the combustion process.…”

Section: Introductionmentioning

confidence: 99%

Puffing and Microexplosion Behavior of Water in Pure Diesel Emulsion Droplets During Leidenfrost Effect

Khan

Aziz

Heikal

et al. 2016

Combustion Science and Technology

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The microexplosion evolution phenomenon of single droplets of water in pure diesel emulsion under Leidenfrost effect has been studied. The tested emulsions were stabilized with a blend of commercial surfactants with three different water contents of 9%, 12% and 15%. A high speed camera synchronized with backlight technique was used to capture the evolution of microexplosion and puffing. Three different droplet diameters of approximately 2.6mm, 2mm and 0.2mm were analysed. It was found that the tendency of microexplosion and puffing frequency was influenced by the droplet diameter. Coalescence was the dominating factor in inducing microexplosion in bigger droplets. It was observed that the child droplets ejected from the parent droplet undergoes further puffing processes.The size of the secondary droplets after microexplosion were also found to be slightly influenced by the parent droplet size.The waiting time for microexplosion and puffing were compared for different droplets size.

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“…The experimental set-up used in this study was the same as the previous study by Khan et al [29]. A high-speed camera (8001-Phantom Miro M310, Wayne, NJ, USA) coupled with high long distance Microscope-K2 (Boulder, Co, USA), a K-type thermocouple and data logger were synchronized to evaluate the micro-explosion event and record the profile of droplet temperature during the event (Figure 3).…”

Section: Hot Plate Techniquementioning

confidence: 99%

“…Kadota et al [12] used a hot plate to investigate emulsion droplet micro-explosions under Leidenfrost conditions. Khan et al [29] conducted a series of experiments on water emulsified diesel suspended on a thin-wire thermocouple to study the Leidenfrost effect. They conclusively showed that for micro-explosions to occur, large dispersed phase water droplets with faster coalescence rate must exist.…”

Section: Introductionmentioning

confidence: 99%

“…The effect of the preparation method of an emulsion, and the fuel pump and injector nozzles used will determine the distribution of both the number and size of the droplets and hence the occurrence of micro-explosion. For example, a homogenizer and mechanical stirrer were used in a previous study [29]. It was observed that all samples of mechanically-stirred emulsions exploded, but no micro-explosion was observed when the emulsion was produced using a homogenizer.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Fuel Injection Equipment of Water-In-Diesel Emulsions on Micro-Explosion Behaviour

et al. 2018

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The number and size distributions of the water dispersed phase have a significant effect on both the long-term stability of an emulsion, and the probability of micro-explosions inside an engine. The emulsions are subjected to intense pressure and shear flow in the fuel injection equipment resulting in changes in the number and size distributions of the dispersed phase. These changes, in turn, have significant effects on the micro-explosion behavior of the droplets. To our knowledge, these effects are not known and have not been reported previously. To uncover some of these effects we carried out a comprehensive experimental investigation on an emulsion spray of 10% water (by volume) in diesel at different injection pressures of 500, 1000 and 1500 bar. A measurement system consisting of a high-speed camera was used to visualize the droplets' micro-explosions and a thermocouple measured the temperature. Our measurements indicated that the emulsion shear in the injector nozzle shifted the emulsion droplet size distribution towards the smaller end resulting in a delay in the onset of micro-explosion. This delay in the onset of the micro-explosion is thought to be due to the decrease in the dispersed water coalescence rate which, in turn, increases the stability of the emulsion. The results also show that this delay in the onset of micro-explosion, and the temperature required for its onset, increased with injection pressure.

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Experimental Investigation of Microexplosion Occurrence in Water in Diesel Emulsion Droplets during the Leidenfrost Effect

Cited by 56 publications

References 15 publications

Investigation of Water-Diesel Emulsion Characteristics using Optical Technique

Investigation of Water-Diesel Emulsion Characteristics using Optical Technique

Puffing and Microexplosion Behavior of Water in Pure Diesel Emulsion Droplets During Leidenfrost Effect

The Effect of Fuel Injection Equipment of Water-In-Diesel Emulsions on Micro-Explosion Behaviour

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