{"title":"Flame propagation behaviors and temperature distribution characteristics of magnesium dust clouds with different particle size polydispersities","authors":"","doi":"10.1016/j.powtec.2024.120098","DOIUrl":null,"url":null,"abstract":"<div><p>To study the influence of particle size polydispersity (<em>σ</em><sub>D</sub>) on the flame propagation and temperature distribution of magnesium dust clouds, an open-space dust explosion measurement system equipped the two-color pyrometer technique were used to explore the flame propagation behaviors and temperature distribution characteristics of magnesium dust clouds with different <em>σ</em><sub>D</sub>. Furthermore, the correlation analysis was applied to assess the correlation degree between the flame propagation velocity and various particle size parameters. The results showed that the flame structure, temperature distribution and propagation velocity were related to the <em>σ</em><sub>D</sub>. Flames in magnesium dust clouds with low <em>σ</em><sub>D</sub> spread around spherically, while those with high <em>σ</em><sub>D</sub> burned more intensely at the bottom part with an irregular structure. The flame temperature increased with the mass fraction of small particles, due to their higher diffusion and heat transfer efficiency. With the increase of <em>σ</em><sub>D</sub> value, the combustion rate of magnesium dust increased, so that the flame propagation velocity accelerated. The results of Pearson analysis verified that <em>σ</em><sub>D</sub> had a significant effect on the flame propagation velocity, which was more suitable than the average Sauter diameter (<em>D</em><sub>3,2</sub>) to describe the explosion characteristics.</p></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":null,"pages":null},"PeriodicalIF":4.5000,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Powder Technology","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0032591024007423","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
To study the influence of particle size polydispersity (σD) on the flame propagation and temperature distribution of magnesium dust clouds, an open-space dust explosion measurement system equipped the two-color pyrometer technique were used to explore the flame propagation behaviors and temperature distribution characteristics of magnesium dust clouds with different σD. Furthermore, the correlation analysis was applied to assess the correlation degree between the flame propagation velocity and various particle size parameters. The results showed that the flame structure, temperature distribution and propagation velocity were related to the σD. Flames in magnesium dust clouds with low σD spread around spherically, while those with high σD burned more intensely at the bottom part with an irregular structure. The flame temperature increased with the mass fraction of small particles, due to their higher diffusion and heat transfer efficiency. With the increase of σD value, the combustion rate of magnesium dust increased, so that the flame propagation velocity accelerated. The results of Pearson analysis verified that σD had a significant effect on the flame propagation velocity, which was more suitable than the average Sauter diameter (D3,2) to describe the explosion characteristics.
期刊介绍：
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.
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