The effect of injection pressure on the droplet size distributions and micro-explosion / Mhadi A. Ismael ... [et al.]

A. Ismael, Mhadi and R. Heikal, Morgan and A. Aziz, A. Rashid and El-Adawy, Mohammed (2018) The effect of injection pressure on the droplet size distributions and micro-explosion / Mhadi A. Ismael ... [et al.]. Journal of Mechanical Engineering (JMechE), SI 7 (1). pp. 91-102. ISSN 18235514

Abstract

Emulsion droplet size plays a key role in the micro-explosion occurrence as well as the stability of the emulsion. In a high-pressure common rail system, the water-in-diesel emulsion is subjected to intense pressure, temperature and shear when passing through the common rail and injector nozzle thereby altering the droplet size distributions as well as the number of droplets. Water emulsified diesel made with 15% of water content by volume was visualized under the microscope before and after the injector nozzle at an injection pressure of 1500 bar. The size and number of the dispersed water droplets were measured using a developed Matlab image processing code. The influences of the size of the dispersed water droplets before and after the injection on the micro-explosion phenomenon were examined using a hot plate technique. A high-speed camera and thermocouple were synchronized to record the images and the temperature of the emulsion droplet. The results indicate that micro-explosion of the emulsion droplets was significantly affected by the injector shearing. Thereby the reduction in the size of the dispersed water droplets resulted in an increase in temperature required to initiate micro-explosion and delayed its onset.

Metadata

Item Type: Article
Creators:
Creators
Email / ID Num.
A. Ismael, Mhadi
UNSPECIFIED
R. Heikal, Morgan
UNSPECIFIED
A. Aziz, A. Rashid
UNSPECIFIED
El-Adawy, Mohammed
UNSPECIFIED
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TL Motor vehicles. Aeronautics. Astronautics > Motor vehicles. Cycles
T Technology > TL Motor vehicles. Aeronautics. Astronautics > Aeronautics. Aeronautical engineering > Mechanics of flight: Aerodynamics
Divisions: Universiti Teknologi MARA, Shah Alam > Faculty of Mechanical Engineering
Journal or Publication Title: Journal of Mechanical Engineering (JMechE)
UiTM Journal Collections: UiTM Journal > Journal of Mechanical Engineering (JMechE)
ISSN: 18235514
Volume: SI 7
Number: 1
Page Range: pp. 91-102
Keywords: Water-diesel emulsion; Micro-explosion; Common rail system; Injector shearing.
Date: 2018
URI: https://ir.uitm.edu.my/id/eprint/41219
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41219

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