Influence of atomization on single and multi-droplet combustion of diesel, biodiesel, and ethanol doped with graphene oxide
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Mosadegh, Sepehr
issued: 2024-05-03T08:20:06Z
issued: 2024
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: The global energy supply will rely on liquid fuels in the foreseeable future, with diesel-like variants witnessing the highest demand across various industries. Recent initiatives have focused on renewable biofuels such as biodiesel and ethanol, which are emerging as environmentally friendly alternatives to conventional diesel. Concurrently, incorporating nanomaterials, specifically Graphene Oxide (GO), into liquid fuels has demonstrated substantial enhancements in combustion power and emission characteristics. In the context of blended and doped fuels, atomization processes involving nucleation, expulsion, and droplet ejection play important roles, potentially influencing combustion characteristics. The focus of the present dissertation is quantifying the effects of atomization on burning rate, dynamics, and flame spread for single and multi-droplets. Suspensions of GO with doping concentrations of 0–0.1% in diesel, biodiesel, and ethanol, were prepared, and characterized. Results of experiments concerning ethanol doped with GO show consistent characteristics of ejected baby droplets for several test conditions. The results suggest the possible burning of the baby droplets within the flame envelope. A conservation-of-mass framework is used and it is shown that after droplets atomize, burning rate increases, but the rate of evaporation decreases. For ethanol droplets, GO addition and increased doping concentration improve the overall burning rate. In GO-doped diesel fuels, atomization induces a low-frequency intermittent coupling between the droplet size and flame chemiluminescence intensity, with amplified oscillations observed at higher GO concentrations. Such low-frequency oscillations are also observed for single and multi-droplet combustion of biodiesel blended with ethanol and doped with GO. For multi-droplet combustion, despite minimal impact on flame dynamics and spread rate among neighboring droplets, the addition of GO introduces a new mode of flame spread…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/88174
note: INFLUENCE OF ATOMIZATIONON SINGLE ANDMULTI-DROPLET COMBUSTIONOF DIESEL, BIODIESEL, ANDETHANOL DOPED WITHGRAPHENE OXIDEbySepehr MosadeghA dissertation submitted in partial fulfillment ofthe requirements for the degree ofDOCTOR OF PHILOSOPHYinThe College of Graduate Studies(Mechanical Engineering)THE UNIVERSITY OF BRITISH COLUMBIA(Okanagan)April 2024© Sepehr Mosadegh, 2024The following individuals certify that they have read, and recommend to the Collegeof Graduate Studies for acceptance, a dissertation entitled: INFLUENCE OF ATOMIZA-TION ON SINGLE AND MULTI-DROPLET COMBUSTION OF DIESEL, BIODIESEL,AND ETHANOL DOPED WITH GRAPHENE OXIDEsubmitted by Sepehr Mosadegh in partial fulfillment of the requirements of the degreeof Doctor of PhilosophyDr. Sina Kheirkhah, School of EngineeringSupervisorDr. Mohammad Arjmand, School of EngineeringSupervisory Committee MemberDr. Ian Foulds, School of EngineeringSupervisory Committee MemberDr. Cigdem Eskicioglu, School of EngineeringUniversity ExaminerDr. Swetaprovo Chaudhuri, University of TorontoExternal ExamineriiAbstractThe global energy supply will rely on liquid fuels in the foreseeable future, with diesel-like variants witnessing the highest demand across various industries. Recent initiativeshave focused on renewable biofuels such as biodiesel and ethanol, which are emerging asenvironmentally friendly alternatives to conventional diesel. Concurrently, incorporatingnanomaterials, specifically Graphene Oxide (GO), into liquid fuels has demonstrated sub-stantial enhancements in combustion power and emission characteristics. In the context ofblended and doped fuels, atomization processes involving nucleation, expulsion, and dropletejection play important roles, potentially influencing combustion characteristics. The fo-cus of the present dissertation is quantifying the effects of atomization on burning rate,dynamics, and flame spread for single and multi-droplets. Suspensions of GO with dopingconcentrations of 0–0.1% in diesel, bi…
has type: Thesis/Dissertation
date issued: 2024-05
is shown at: 10.14288/1.0442103
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Kheirkhah, Sina
type: Text
identifier URI: http://hdl.handle.net/2429/88174