Investigation of Puffing and Micro-Explosion of Water-in-Diesel Emulsion Spray Using Shadow Imaging

Mhadi A. Ismael, Morgan R. Heikal, A. Rashid A. Aziz, Cyril Crua, Mohmmed El-Adawy, Zuhaib Nissar, Masri B. Baharom, Ezrann Z. Zainal A. and Firmansyah
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Mhadi A. Ismael: Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
Morgan R. Heikal: Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
A. Rashid A. Aziz: Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
Cyril Crua: School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, UK
Mohmmed El-Adawy: Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
Zuhaib Nissar: Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
Masri B. Baharom: Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
Ezrann Z. Zainal A.: Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
Firmansyah: Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia

Energies, 2018, vol. 11, issue 9, 1-12

Abstract: Water-in-diesel emulsions potentially favor the occurrence of micro-explosions when exposed to elevated temperatures, thereby improving the mixing of fuels with the ambient gas. The distributions and sizes of both spray and dispersed water droplets have a significant effect on puffing and micro-explosion behavior. Although the injection pressure is likely to alter the properties of emulsions, this effect on the spray flow puffing and micro-explosion has not been reported. To investigate this, we injected a fuel spray using a microsyringe needle into a high-temperature environment to investigate the droplets’ behavior. Injection pressures were varied at 10% v / v water content, the samples were imaged using a digital microscope, and the dispersed droplet size distributions were extracted using a purpose-built image processing algorithm. A high-speed camera coupled with a long-distance microscope objective was then used to capture the emulsion spray droplets. Our measurements indicated that the secondary atomization was significantly affected by the injection pressure which reduced the dispersed droplet size and hence caused a delay in puffing. At high injection pressure (500, 1000, and 1500 bar), the water was evaporated during the spray and although there was not enough droplet residence time, puffing and micro-explosion were clearly observed. This study suggests that high injection pressures have a detrimental effect on the secondary atomization of water-in-diesel emulsions.

Keywords: water-in-diesel; micro-explosion; puffing; dispersed water droplet (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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