Numerical analysis of nanoaluminum combustion in steam

Starik, A. M.; Kuleshov, P. S.; Sharipov, Alexander S.; Титова, Н. С.; Tsai, Chuen‐Jinn

doi:10.1016/j.combustflame.2013.12.007

Cited by 47 publications

(25 citation statements)

References 26 publications

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“…The introduction of water jets causes part of the water jets to form water vapor due to the excessively high temperature in the processing area during laser processing. Related studies [ 26 , 27 ] have shown that magnesium further promotes aluminum and water vapor to undergo t related reaction processes.…”

Section: Experimental Detection and Processing Resultsmentioning

confidence: 99%

Study on the Influence of Surface Temperature Field of Aluminum Alloy Etched by Laser Water Jet Composite Machining

Chen

Liu

et al. 2020

Materials

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This paper studies the compound effect of liquid medium and laser on the workpiece and analyses the law of material surface temperature change during the processing. Taking 7075-T6 aluminum alloy as the research object, the surface temperature field of aluminum alloy processed using water-jet-assisted laser machining under different process parameters was simulated using finite element software. In addition, the temperature field of the material surface was detected in real-time using the self-built water-jet-assisted laser machining temperature field detection system, and the processing results were observed and verified using an optical microscope, scanning electron microscope, and energy spectrum analyzer. The results show that when the water jet inflow angle is 45°, the heat-affected area of the material surface is the smallest, and the cooling effect of the temperature field of the material surface is better. Considering the liquidus melting point of 7075 aluminum alloys, it is concluded that the processing effect is better when the water jet velocity is 14 m·s−1, the laser power is 100 W, and the laser scanning speed is 1.2 mm·s−1. At this time, the quality of the tank is relatively good, there are no cracks in the bottom of the tank, and there is less slag accumulation. Compared with anhydrous laser etching, water-jet-assisted laser etching can reduce the problems of micro-cracks, molten slag, and the formation of a recast layer in laser etching and improve the quality of the workpiece, and the composition of the bottom slag does not change. This study provides theoretical guidance and application support for the selection and optimization of process parameters for water-jet-assisted laser etching of aluminum alloy and further enriches the heat transfer mechanism of multi-field coupling in the process of water-jet-assisted laser machining.

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Section: Experimental Detection and Processing Resultsmentioning

confidence: 99%

Study on the Influence of Surface Temperature Field of Aluminum Alloy Etched by Laser Water Jet Composite Machining

Chen

Liu

et al. 2020

Materials

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“…That's why Al-H 2 O reactions haven't ensured yet so far researcher uses arbitrary mechanism as making the product of major species properly. As referring Washburn et al [7] and Starik et al [8], kinetic mechanism has found total 41 reactions and 19 species and is shown in TABLE I. The 16 reactions mean to react with aluminum and water vapor and the 20 reactions mean to dissociate water vapor and the 5 reactions mean to condense/dissociate alumina.…”

Section: Chemical Kinetic Mechanismmentioning

confidence: 86%

Numerical Analysis of Combustion of a Single Aluminum Droplet in Water Vapor

2015

International Conference Data Mining, Civil and Mechanical Engineering (ICDMCME’2015) Feb. 1-2, 2015 Bali (Indonesia)

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In this study, variable chemical kinetic mechanism between aluminum and water vapor were selected. Major species, which were produced by reaction with aluminum and water vapor, were compared with another reference as a result total 41 chemical kinetic mechanism and 19 species were validated. Aluminum droplet size is 230 μm and analyzed as 2-D axisymmetric model. As using Fluent 13.0, governing equations and species equation were solved on surrounding aluminum droplet. The condensation/dissociation of alumina, that is the species of major aluminum oxide, were considered by including chemical kinetic mechanism.

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“…So, they have smaller melting point, lower ignition temperature and higher flame speed [20][21][22][23][24][25]. For example, nano-sized aluminum particles ignite in air at the temperature of 900 K, whereas the micron-sized particles cannot be ignited at the temperature below 2350 K. It is believed that small size non-oxidized nanoparticles undergo the explosion due to fast oxidation of surface layer, and aluminum reacts with oxidizer in a liquid or gas phase [26][27][28].…”

Section: Introductionmentioning

confidence: 98%

“…As it was demonstrated by a number of researches, particle diameter plays a significant role in burning of particles in different oxidizers [16][17][18][19][20][21][22], and nanoscale metallic particles offer some significant advantages over micrometer-sized ones. So, they have smaller melting point, lower ignition temperature and higher flame speed [20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%