Modeling soot formation in diesel-biodiesel flames

[Display omitted] •A new phenomenological soot model is proposed for diesel-biodiesel blends.•The model takes into account the main soot-reducing factors of biodiesel blending.•The model is solved for the standard smoke point lamp using CFD.•The model computations are in very good agreement with pub...

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Bibliographic Details
Published in:Fuel (Guildford) 2017-10, Vol.206, p.437-452
Main Authors: Arad, Alumah, Sher, Eran, Enden, Giora
Format: Article
Language:English
Subjects:
Aliphatic compounds
Biodiesel
Biodiesel fuels
Biofuels
Blend
Computational fluid dynamics
Computer applications
Concentration (composition)
Diesel
Diesel fuels
Fluid dynamics
Fuel
Hydrodynamics
Mathematical models
Oxidation
Oxygen content
Smoke
Soot
Switching
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Summary:[Display omitted] •A new phenomenological soot model is proposed for diesel-biodiesel blends.•The model takes into account the main soot-reducing factors of biodiesel blending.•The model is solved for the standard smoke point lamp using CFD.•The model computations are in very good agreement with published experimental results. We propose a modified phenomenological model for soot formation that occurs during the combustion process of diesel-biodiesel blends. The diesel-biodiesel blend is represented by three generic fuel groups: aromatic, aliphatic, and ester fuels, such that the aromatic content of the diesel fuel and the oxygen content of the biodiesel fuel are considered quantitatively. The soot formation is evaluated for specific selected blends. The different oxidative reactivity between soot particles originating from diesel and biodiesel is accounted for via their oxidation rates. The use of the present phenomenological soot model is demonstrated by its implementation in a computational fluid dynamics (CFD) commercial code for the case of the standard smoke point lamp. Very good agreement was achieved between model predictions and experimental results in terms of maximal soot volume fraction (SVF) and its decrease when switching from plain diesel to a diesel-biodiesel blend.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2017.06.024