A closer look at determining burning rates with imaging diagnostics

Bratton, K. Ryan; Woodruff, Connor; Campbell, Loudon L.; Heaps, Ronald J.; Pantoya, Michelle L.

doi:10.1016/j.optlaseng.2019.105841

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…This made it difficult to visually determine the exact coordinates of the boundary of the glowing area. To overcome this difficulty, the method of tracking a point with the same pixel intensity on the image was used [32]. Tracking the change in the coordinate of such a pixel in a series of consecutive photos allowed to determine the expansion of the glowing area along the selected direction.…”

Section: Discussionmentioning

confidence: 99%

Explosive Burning of a Mechanically Activated Al and CuO Thermite Mixture

et al. 2022

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The results of experiments to determine the role of structural schemes for the ignition of a mechanically activated thermite mixture Al–CuO and the formation of its combustion flame are presented. The reaction initiated in the bulk of the experimental assembly transforms into torch combustion in an open space. The dynamics of the volume of the flame reaction region was determined. The stage of flame formation has a stochastic character, determined by the random distribution of the reaction centres in the initial volume of the components. A high-speed camera, a pyrometer and electro contact sensors were used as diagnostic tools. The ultimate goal of the study was to optimize the conditions for the flame formation of this mixture for its effective use with a single ignition of various gas emissions.

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Section: Discussionmentioning

confidence: 99%

Explosive Burning of a Mechanically Activated Al and CuO Thermite Mixture

et al. 2022

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“…Aluminum (Al) particle is widely applicated in thermites due to its high reactivity, combustion enthalpy, and commercial availability [1][2][3][4]. The oxidizers used in thermites vary in terms of particle sizes and morphologies to optimize combustion performance, including low ignition delay, high combustion rate, high heat release, and high combustion temperature [5][6][7][8][9]. Extensive research has demonstrated that optimizing the interfacial properties of thermites can effectively enhance combustion performance, primarily by increasing the contact area between components [10] or employing surface modification on the metal particles [7,8,11].…”

Section: Introductionmentioning

confidence: 99%

Combustion characteristics of Al/PTFE materials with different microstructures

Zhou,

Zhen,

et al. 2024

Mater. Res. Express

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The microstructures play a crucial role in the combustion of aluminum/polytetrafluoroethylene (Al/PTFE) materials. Mechanically activated Al/PTFE typically demonstrates higher reactivity but a lower combustion rate compared to physically mixed Al/PTFE. Recently, the combustion performance of fuel-rich Al/PTFE has been well explained by the microexplosion mechanism. In this study, the combustion characteristics of stoichiometric Al/PTFE (26.5:73.5 wt%) materials with varying microstructures were investigated to further the understanding of their combustion mechanism and offer insights for their potential applications in metal cutting. The Al/PTFE materials with different microstructures were prepared using sonication and ball milling methods. The results of scanning electron microscope (SEM) analysis suggest that the sonicated Al/PTFE (s-Al/PTFE) containing spherical Al particles displayed a loosely dispersed structure, while the milled Al/PTFE (m-Al/PTFE) exhibited a densely layered structure with flake-like Al particles coated by the PTFE matrix. The milled Al/PTFE was found to be mechanically activated. Combustion in quartz tubes was recorded using a high-speed camera and a video. Combustion of s-Al/PTFE demonstrated a high-temperature flame (~2346 K) and obvious microexplosions featuring hot particles ejection, while combustion of m-Al/PTFE showed a weak flame (~2037 K) and slow-burning, featuring dense carbon smoke. Increasing the powder density was observed to slightly decrease (~100 K) flame temperature. Microstructure and phase analysis of combustion products were systematically conducted to elucidate the combustion behaviors. The results suggest that the residue of s-Al/PTFE contained high AlF3 and low carbon content, whereas the residue of m-Al/PTFE exhibited the opposite condition. The results of the combustion tests suggest that microexplosions promoted the oxidation of hot Al particles and carbon products, consequently leading to a fast reaction, high flame temperature, and enhanced heat transfer capability.

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Silicon alloying enhances fast heating rate combustion of aluminum particles

Vaz

Pantoya

2022

Combustion and Flame

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A closer look at determining burning rates with imaging diagnostics

Cited by 3 publications

References 26 publications

Explosive Burning of a Mechanically Activated Al and CuO Thermite Mixture

Explosive Burning of a Mechanically Activated Al and CuO Thermite Mixture

Combustion characteristics of Al/PTFE materials with different microstructures

Silicon alloying enhances fast heating rate combustion of aluminum particles

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