Advancement in comprehending the evolution of nanooxides in flames using laser irradiation

Iuliis, Silvana De; Dondé, R.; Altman, Igor

doi:10.1016/j.cplett.2021.139213

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…The latter should be taken into account when designing the multiwire GWGs intended to enlarge produced nanoparticles, and further extend the device range for industrial applications. Additionally, the phenomenon found on the variation of the nanoparticle generation rate depending on the nucleating source orientation in the gas flow may have general implications for the mechanisms of nanoparticle formation [21] in flames during combustion.…”

Section: Discussionmentioning

confidence: 99%

Nanoparticle Generation in Glowing Wire Generator: Insight into Nucleation Peculiarities

et al. 2021

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The paper studies nanoparticle formation in a glowing wire generator (GWG), in which the gas carrier flows around heated metal wire, producing aerosols from a vapor released from the surface. The device has been customized, enabling the use of a double-wire in different orientations in regard to the gas flow. Such alterations provided different effective distances between wires enabling investigation of their mutual influence. Concentration of particles produced in the GWG at different parameters (applied voltage and a gas flow) was carefully measured and analysed. Different regimes of a nanoparticle nucleation were identified that resulted from the applied voltage variation and the gas flow direction. In particular, independent nucleation of nanoparticles on both parts of the wire occurred in the wire plane’s configuration perpendicular to the gas flow, whilst dependent nucleation of nanoparticles was observed at a certain specific set of parameters in the configuration, in which the wire plane was parallel to the gas flow. Two corresponding functions were introduced in order to quantify those nucleation regimes and they tend to zero when either independent or dependent nucleation occur. The peculiarities found ought to be considered when designing the multi-wire GWGs in order to further extend the device’s range for industrial applications.

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Section: Discussionmentioning

confidence: 99%

Nanoparticle Generation in Glowing Wire Generator: Insight into Nucleation Peculiarities

et al. 2021

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“…Species detected, e.g., by LIF, include Fe, FeO, SiO, AlO, TiO, and others . Laser methods can be difficult to apply in dense media with spray and particle clouds, but techniques such as LII, LIBS, and line-of-sight attenuation can be valuable for analyzing the process development and/or materials properties in situ . ,,,, Further diagnostic approaches include tomographic imaging with multiple simultaneous emission measurements, wide-angle light scattering for in situ determination of droplet and particle size distributions, and mass spectrometry to probe the particle growth. , To improve the understanding of flame synthesis reaction systems further, specific aspects have been investigated in depth, for example by studying atomization, droplet formation, and droplet–gas phase interactions, or by modeling the dynamics of SiO 2 nanoparticle synthesis using Reynolds-averaged Navier–Stokes (RANS) or large eddy simulation (LES). , …”

Section: Developments For Systems and Applicationsmentioning

confidence: 99%

Combustion, Chemistry, and Carbon Neutrality

Kohse‐Höinghaus

2023

Chem. Rev.

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Combustion is a reactive oxidation process that releases energy bound in chemical compounds used as fuels�energy that is needed for power generation, transportation, heating, and industrial purposes. Because of greenhouse gas and local pollutant emissions associated with fossil fuels, combustion science and applications are challenged to abandon conventional pathways and to adapt toward the demand of future carbon neutrality. For the design of efficient, low-emission processes, understanding the details of the relevant chemical transformations is essential. Comprehensive knowledge gained from decades of fossil-fuel combustion research includes general principles for establishing and validating reaction mechanisms and process models, relying on both theory and experiments with a suite of analytic monitoring and sensing techniques. Such knowledge can be advantageously applied and extended to configure, analyze, and control new systems using different, nonfossil, potentially zero-carbon fuels. Understanding the impact of combustion and its links with chemistry needs some background. The introduction therefore combines information on exemplary cultural and technological achievements using combustion and on nature and effects of combustion emissions. Subsequently, the methodology of combustion chemistry research is described. A major part is devoted to fuels, followed by a discussion of selected combustion applications, illustrating the chemical information needed for the future.

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“…The obtained universal character of that loss, i. e., its proportionality to the initial mass of the burning particle is in disagreement with any combustion model known to the authors. The light emission puzzles can be naturally resolved considering the condense‐luminescent character of radiation (see [11] and references therein). The justification for condense‐luminescence supports the importance of including details of condensation of gaseous species in modeling, especially when metal particle combustion is accompanied by the formation of nano‐oxides.…”

Section: Deficiencies In Current Concepts Of Metal Particle Combustionmentioning

confidence: 99%

“…Assuming that half of the released energy transfers from the reaction zone to the particle surface, energy released looks excessive even if Mg vapor heating from the particle temperature to the reaction zone temperature is considered. The energy excess is, however, apparent since a significant part of condensation energy releases via light emission due to condense‐luminescence [11], and the corresponding energy is lost in the energy balance. As a result, the energy balance requires partial condensation of magnesia vapor on the surface of the burning Mg particle to sustain the process [41].…”

Section: Energy Balance and Regimes Of Combustionmentioning

confidence: 99%

Comprehending Metal Particle Combustion: a Path Forward

Altman

Pantoya

2022

Propellants Explo Pyrotec

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The paper discusses the physics required for accurate modeling of metal particle combustion and includes aspects previously neglected. Specifically, three physical phenomena are emphasized: 1) internal boiling on the condensed oxide-metal interface; 2) condense-luminescent loss during nano-oxide formation; and, 3) suppressed heat transfer on the metal particle surface due to a low energy accommodation coefficient (EAC) are essential. The last two phenomena were explored in previous work. Internal particle interface boiling detailed in the current work enables the semi-heterogeneous combustion of Al particles, an im-portant process needing attention for accurate modeling. The interface boiling mechanism allowing for the semi-heterogeneous combustion explains a number of experimental puzzles related to metal particle combustion. In particular, the semi-heterogeneous combustion justifies the coexistence of two burning regimes of Al particles (slow and fast) recently observed. Based on reported findings, revising current numerical models for metal particle combustion to include these three physical phenomena is necessary. Implications toward enhancement of energetic performance for metal-containing formulations are also discussed.

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Advancement in comprehending the evolution of nanooxides in flames using laser irradiation

Cited by 7 publications

References 16 publications

Nanoparticle Generation in Glowing Wire Generator: Insight into Nucleation Peculiarities

Nanoparticle Generation in Glowing Wire Generator: Insight into Nucleation Peculiarities

Combustion, Chemistry, and Carbon Neutrality

Comprehending Metal Particle Combustion: a Path Forward

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