Dynamic behaviors of flame and molten insulation in electrical wire fire under applied electric field

IF 5.2 2区 工程技术 Q2 ENERGY & FUELS
Jeong Park , Chun Sang Yoo , Suk Ho Chung
{"title":"Dynamic behaviors of flame and molten insulation in electrical wire fire under applied electric field","authors":"Jeong Park ,&nbsp;Chun Sang Yoo ,&nbsp;Suk Ho Chung","doi":"10.1016/j.proci.2025.105862","DOIUrl":null,"url":null,"abstract":"<div><div>This study reviews recent findings on the dynamic behaviors of flame and molten insulation material observed in spreading flames over electrical wires under applied electric fields, which is a relevant scenario in electrical wire safety. The important roles of various unique dynamic behaviors in flame spreads are discussed, including fuel-vapor jet ejection from molten polyethylene (PE) surface, internal circulation of molten PE driven by Marangoni convection, dripping of molten PE, electrospray ejecting multiple small droplets from molten PE surface, and lateral dielectrophoresis by migrating a part of main molten PE toward the burnt wire side by forming a secondary molten PE or a liquid film of molten PE and sometimes leading to a formation of splitting flame. Additional behaviors such as vibration/rotation of molten PE due to a vertical dielectrophoresis, flame-leaning toward the burnt wire side caused by ionic wind, and magnetic field induced flame vortices near flame edges are also reviewed. The physical mechanisms of these dynamic behaviors are explained. Various regimes are identified depending on the occurrence of abovementioned phenomena. The dependence of flame spread rate on relevant physical parameters is reviewed, revealing a non-monotonic response to applied AC voltage and frequency, due to the intricate interactions among various dynamic phenomena. Phenomenological correlations are established for the FSR using key physical parameters including wire diameter, wire core diameter, applied voltage and frequency, and radial electric field gradient. To better understand the dynamic behaviors of molten insulation, the combustion of a droplet suspended on a wire was investigated, isolating the effects of solid-to-liquid phase change and the asymmetric distribution of molten PE between the burnt and unburned sides of the wire. The dynamic behaviors of such burning droplets under applied electric fields, along with their underlying mechanisms, are also reviewed and discussed.</div></div>","PeriodicalId":408,"journal":{"name":"Proceedings of the Combustion Institute","volume":"41 ","pages":"Article 105862"},"PeriodicalIF":5.2000,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Combustion Institute","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1540748925000768","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0

Abstract

This study reviews recent findings on the dynamic behaviors of flame and molten insulation material observed in spreading flames over electrical wires under applied electric fields, which is a relevant scenario in electrical wire safety. The important roles of various unique dynamic behaviors in flame spreads are discussed, including fuel-vapor jet ejection from molten polyethylene (PE) surface, internal circulation of molten PE driven by Marangoni convection, dripping of molten PE, electrospray ejecting multiple small droplets from molten PE surface, and lateral dielectrophoresis by migrating a part of main molten PE toward the burnt wire side by forming a secondary molten PE or a liquid film of molten PE and sometimes leading to a formation of splitting flame. Additional behaviors such as vibration/rotation of molten PE due to a vertical dielectrophoresis, flame-leaning toward the burnt wire side caused by ionic wind, and magnetic field induced flame vortices near flame edges are also reviewed. The physical mechanisms of these dynamic behaviors are explained. Various regimes are identified depending on the occurrence of abovementioned phenomena. The dependence of flame spread rate on relevant physical parameters is reviewed, revealing a non-monotonic response to applied AC voltage and frequency, due to the intricate interactions among various dynamic phenomena. Phenomenological correlations are established for the FSR using key physical parameters including wire diameter, wire core diameter, applied voltage and frequency, and radial electric field gradient. To better understand the dynamic behaviors of molten insulation, the combustion of a droplet suspended on a wire was investigated, isolating the effects of solid-to-liquid phase change and the asymmetric distribution of molten PE between the burnt and unburned sides of the wire. The dynamic behaviors of such burning droplets under applied electric fields, along with their underlying mechanisms, are also reviewed and discussed.
外加电场作用下电线着火火焰和熔融绝缘的动态行为
本文综述了在外加电场作用下火焰在电线上蔓延时火焰和熔融绝缘材料的动态行为,这是电线安全的一个相关场景。各种独特的动态行为的重要角色在火焰传播进行了讨论,包括燃油蒸气喷射退出熔融聚乙烯(PE)表面,内部熔融PE由马朗戈尼对流循环,滴的熔融PE、电喷射排出多个小水滴从熔融PE表面,通过形成次级熔融PE或熔融PE的液膜,有时导致分裂火焰的形成,将部分主熔融PE向烧丝侧迁移。此外,本文还回顾了熔融聚乙烯由于垂直介质电泳引起的振动/旋转、离子风引起的火焰向燃烧线一侧倾斜以及火焰边缘附近磁场诱导的火焰漩涡等其他行为。对这些动态行为的物理机制进行了解释。根据上述现象的发生情况,确定了不同的制度。回顾了火焰蔓延速率与相关物理参数的关系,揭示了由于各种动态现象之间复杂的相互作用,火焰蔓延速率对施加的交流电压和频率的非单调响应。利用线径、线芯直径、外加电压和频率以及径向电场梯度等关键物理参数,建立了FSR的现象学相关性。为了更好地理解熔融绝缘的动态行为,研究了悬浮在导线上的液滴的燃烧,隔离了固液相变的影响以及熔融PE在导线燃烧侧和未燃烧侧之间的不对称分布。本文还回顾和讨论了这种燃烧液滴在外加电场作用下的动力学行为及其潜在机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Proceedings of the Combustion Institute
Proceedings of the Combustion Institute 工程技术-工程:化工
CiteScore
7.00
自引率
0.00%
发文量
420
审稿时长
3.0 months
期刊介绍: The Proceedings of the Combustion Institute contains forefront contributions in fundamentals and applications of combustion science. For more than 50 years, the Combustion Institute has served as the peak international society for dissemination of scientific and technical research in the combustion field. In addition to author submissions, the Proceedings of the Combustion Institute includes the Institute''s prestigious invited strategic and topical reviews that represent indispensable resources for emergent research in the field. All papers are subjected to rigorous peer review. Research papers and invited topical reviews; Reaction Kinetics; Soot, PAH, and other large molecules; Diagnostics; Laminar Flames; Turbulent Flames; Heterogeneous Combustion; Spray and Droplet Combustion; Detonations, Explosions & Supersonic Combustion; Fire Research; Stationary Combustion Systems; IC Engine and Gas Turbine Combustion; New Technology Concepts The electronic version of Proceedings of the Combustion Institute contains supplemental material such as reaction mechanisms, illustrating movies, and other data.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:604180095
Book学术官方微信