Simulations of TiO<inf>2</inf> nanoparticles synthesised off-centreline in jet-wall stagnation flames
Publication Date
2022-05Journal Title
Journal of Aerosol Science
ISSN
0021-8502
Publisher
Elsevier BV
Type
Article
This Version
AM
Metadata
Show full item recordCitation
Bringley, E., Manuputty, M., Lindberg, C., Leon, G., Akroyd, J., & Kraft, M. (2022). Simulations of TiO<inf>2</inf> nanoparticles synthesised off-centreline in jet-wall stagnation flames. Journal of Aerosol Science https://doi.org/10.1016/j.jaerosci.2021.105928
Abstract
A theoretical analysis of the formation of titanium dioxide (TiO2) nanoparticles from titanium tetraisopropoxide (TTIP) in premixed, jet-wall stagnation flames was performed to investigate the variation of the particle properties as a function of deposition radius. Two different TTIP loadings (280 and 560 ppm) were studied in two flames: a lean flame (equivalence ratio, ϕ = 0.35) and a stoichiometric flame (ϕ = 1.0). First, the growth of particles was described using a spherical particle model that was fully coupled to the conservation equations of chemically reacting flow and solved in 2D using the finite volume method. Second, particle trajectories were extracted from the 2D simulations and post-processed using a hybrid particle-number/detailed particle model solved using a stochastic numerical method. In the 2D simulations, the particles were predicted to have mean diameters in the range 3–10 nm, which is consistent with, but slightly less than experimental values observed in the literature. Off-centreline particle trajectories experienced longer residence times at higher temperatures downstream of the flame front. Two particle size distribution (PSD) shapes were observed. In the lean flame, a bimodal PSD was observed due to the high rates of inception and surface growth. In contrast, the stoichiometric flame was dominated by coagulation and the particles quickly attained a self-preserving size distribution. The PSDs were found to be different beyond a deposition radius of approximately one and a half times the nozzle radius due to a small degree of aggregation; this may impact the synthesis of nanoparticles using jet-wall stagnation flames for novel applications. Suggestions are made for future work, not least including the need for the predicted radial behaviour to be tested experimentally.
Relationships
Is supplemented by: https://doi.org/10.17863/CAM.66854
Sponsorship
This research was supported by the National Research Foundation, Prime Minister’s Office, Singapore under its Campus for Research Excellence and Technological Enterprise (CREATE) programme. EJB was funded by a Gates Cambridge Scholarship (OPP1144). GL was funded by a CONACYT Cambridge Scholarship and acknowledges the National Council of Science and Technology and the Cambridge Commonwealth Trust. MK gratefully acknowledges the support of the Alexander von Humboldt foundation. The authors are grateful to the University of Cambridge Research Computing Service for their technical support.
Embargo Lift Date
2024-01-11
Identifiers
External DOI: https://doi.org/10.1016/j.jaerosci.2021.105928
This record's URL: https://www.repository.cam.ac.uk/handle/1810/331731
Statistics
Total file downloads (since January 2020). For more information on metrics see the
IRUS guide.