Laser-Induced Ignition and Combustion of Individual Aluminum Particles Below 10 μm by Microscopic High-Speed Cinematography

Hou, Fengting; Li, Shengji; Wang, Yue

doi:10.3390/pr8030280

Cited by 11 publications

(5 citation statements)

References 25 publications

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“…Therefore, the ignition power density (IPD) can be expressed by the ratio of the beam power to the area of focal spot (IPD = 4P L /(πD 2 fbs )). More details about the setup could be found in our previous work [16].…”

Section: Experimental Setup 221 Laser Ignitionmentioning

confidence: 99%

Combustion of Laser-Induced Individual Magnesium Microparticles under Natural Convection

et al. 2021

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Metal magnesium (Mg) fuels have been widely used in rocket propellants. The combustion study on individual Mg microparticles is crucial to the in-depth unveiling of the combustion mechanism of Mg-based propellants. In this paper, a new experimental setup was proposed to directly observe the combustion of individual micron-sized Mg particles, based on laser ignition and microscopic high-speed cinematography. The combustion process of individual Mg microparticles could be directly and clearly observed by the apparatus at high temporal and spatial resolutions. Individual Mg microparticles took gas phase combustion, and mainly underwent four stages: expansion, melting, gasification, ignition, and combustion. The ignition delay time and total combustion time had an exponential decay on the particle diameter, and they had a linear decay on the ignition power density. The melting took a dominant role in the whole burnout time. The gas-phase combustion flame seemed thick, inhomogeneous, and ring-like structure. The combustion model of individual Mg microparticles was built through combining the experimental results with the SEM, XRD, XPS, and EDS analysis of original samples and combustion residues. This study will be beneficial to understand the combustion process and reveal the combustion mechanism of metal microparticles besides Mg.

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Section: Experimental Setup 221 Laser Ignitionmentioning

confidence: 99%

Combustion of Laser-Induced Individual Magnesium Microparticles under Natural Convection

et al. 2021

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“…The cool wall of the micro-combustor would result in a large heat loss [14], possibly influencing the ignition delay time and threshold ignition energy. According to our previous work [24], the wall had a similar temperature rise trend as the microparticle directly lying at the bottom wall of the micro-combustor, which was heated by laser. The temperature difference between the microparticle and the combustor wall gradually increases with the increase of microparticle temperature.…”

Section: Influence Of the Wall Heat Loss On The Ignitionmentioning

confidence: 89%

Laser-Induced Ignition and Combustion Behavior of Individual Graphite Microparticles in a Micro-Combustor

et al. 2020

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Microscale combustion has potential application in a micro power generator. This paper studied the ignition and combustion behavior of individual graphite microparticles in a micro-combustor to explore the utilization of carbon-based fuels at the microscale system. The individual graphite microparticles inside the micro-combustor were ignited by a highly focused laser in an air flow with natural convection at atmospheric temperature and pressure. The results show that the ignition of graphite microparticles was heterogeneous. The particle diameter had a small weak effect on ignition delay time and threshold ignition energy. The micro-combustor wall heat losses had significant effects on the ignition and combustion. During combustion, flame instability, photophoresis, repetitive extinction and reignition were identified. The flame structure was asymmetric, and the fluctuation of flame front and radiation intensity showed combustion instability. Photophoretic force pushed the graphite away from the focal point and resulted in extinction. Owing to large wall heat loss, the flame quickly extinguished. However, the graphite was inductively reignited by laser.

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“…The experiments found that the rupture of the oxide shell occurred after the melting of the internal Al, and the expansion of the molten Al liquid was one of the factors affecting the rupture of the shell. Hou et al [13] used a high-speed microscope to record the combustion process of Al nanoparticles under laser ignition, and the results also showed that the thermal expansion of Al nanoparticles leads to the rupture of the alumina shell, and the molten Al core overflows and evaporates, resulting in ignition and combustion. Sun et al [14] used thermogravimetric analyzers and differential scanning calorimetry to study the thermal reaction properties of nanoscale and microscale Al nanoparticles in a CO 2 environment.…”

Section: Introductionmentioning

confidence: 99%

Study on the Size Dependence of the Shell-Breaking Response of Micro/Nano Al Particles at High Temperature

Zhou,

Chai,

Wang

et al. 2024

Nanomaterials

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The reactivity of Al nanoparticles is significantly higher than that of micron Al particles, and the thermal reaction properties exhibit notable distinctions. Following the previous studies on micron Al particles, the shell-breaking response of Al nanoparticles under vacuum conditions was analyzed using COMSOL simulation. Relationships between thermal stabilization time, shell-breaking cause, shell-breaking response time, and particle size were obtained, and a systematic analysis of the differences between micrometer and nanometer-sized particles was conducted. The results indicate that the thermal stabilization time of both micrometer and nanometer particles increases with the enlargement of particle size. The stress generated by heating Al nanoparticles with sizes ranging from 25–100 nm is insufficient to rupture the outer shell. For particles within the size range of 200 nm to 70 μm, the primary cause of shell-breaking is compressive stress overload, while particles in the range of 80–100 μm experience shell rupture primarily due to tensile stress overload. These results provide an important basis for understanding the shell-breaking mechanism of microns and nanoparticles of Al and studying the oxidation mechanism.

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Laser-Induced Ignition and Combustion of Individual Aluminum Particles Below 10 μm by Microscopic High-Speed Cinematography

Cited by 11 publications

References 25 publications

Combustion of Laser-Induced Individual Magnesium Microparticles under Natural Convection

Combustion of Laser-Induced Individual Magnesium Microparticles under Natural Convection

Laser-Induced Ignition and Combustion Behavior of Individual Graphite Microparticles in a Micro-Combustor

Study on the Size Dependence of the Shell-Breaking Response of Micro/Nano Al Particles at High Temperature

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