Modelling of Liquid Breakup Mechanisms in Engineering Systems

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dc.contributor.advisor Sher, I. Diemuodeke, Ogheneruona Endurance 2015-06-24T17:18:50Z 2015-06-24T17:18:50Z 2014-09
dc.description.abstract Effective design of liquid fuel injection systems is a function of good understanding of liquid breakup mechanisms. A transient liquid breakup model is developed on the classical interfacial breakup theory by modifying the classical linear perturbation process to include time-dependent base and perturbed flow parameters. The non-isothermal condition on liquid jet instability and breakup is theoretically modelled; with the particular consideration of a spatially variation of surface tension along the liquid-gas interface. The model combines the classical interface hydrodynamic instability and breakup theory and heat-transfer through semi-infinite medium. Analytical liquid breakup model, which combines transient and non-isothermal effects on liquid jet breakup, is suggested. The suggested model could be simplified to the transient breakup model and the non-isothermal breakup model equivalents. A novel mechanistic model, which is based on a simple momentum balance between the injected jet and the aerodynamic drag force, is suggested for breakup length. A new model, which combines energy criterion and dual-timescale for turbulent shear in droplet dispersion, is suggested for droplet breakup criteria on the basis of critical Webber number. All developed models showed good predictions of available experimental data, and established empirical correlation, within the operational conditions of contemporary ICEs, specifically diesel engines. Continued research in these areas could benefit the development of the next generation of liquid fuel injectors and combustors – by accounting for transient effects and non-isothermal conditions in liquid jet breakup, and turbulent shear in droplet breakup. en_UK
dc.language.iso en en_UK
dc.publisher Cranfield University en_UK
dc.rights © Cranfield University 2014. All rights reserved. No part of this publication may be reproduced without the written permission of the copyright owner. en_UK
dc.subject Analytical Modelling en_UK
dc.subject Droplet Breakup Criteria en_UK
dc.subject Instability Theory en_UK
dc.subject Linear Perturbation en_UK
dc.subject Non-Isothermal Effects en_UK
dc.subject Transient Effects en_UK
dc.subject Turbulent Shear en_UK
dc.title Modelling of Liquid Breakup Mechanisms in Engineering Systems en_UK
dc.type Thesis or dissertation en_UK
dc.type.qualificationlevel Doctoral en_UK
dc.type.qualificationname PhD en_UK

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