Effect of core metal on flame spread and extinction for horizontal electrical wire with applied AC electric fields
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Accepted manuscript
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2022-09-17
Type
ArticleKAUST Department
Combustion and Laser Diagnostics LaboratoryMechanical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2020-09-17Online Publication Date
2020-09-17Print Publication Date
2020-09Embargo End Date
2022-09-17Submitted Date
2019-11-02Permanent link to this record
http://hdl.handle.net/10754/665384
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The effect of metal core on flame spread behavior over polyethylene (PE)-insulated electrical wire was experimentally investigated by varying applied AC voltage (VAC) and frequency (fAC). The present experimental results with Cu-core were compared with those conducted previously with NiCr-core. Flame spread rate (FSR) with Cu-core for the baseline case with no electric field was larger than that with NiCr-core. Both FSR and flame size were appreciably influenced by applied AC electric fields and behaved differently for Cu- and NiCr-cores. For Cu-core, FSR behavior could be classified into four regimes as fAC increases: increasing FSR (regime I), decreasing FSR (II), and again increasing FSR (III) and decreasing FSR (IV). While for NiCr-core, it has been categorized into two regimes I and II. FSR behavior was qualitatively similar to that of flame width in regimes I, II, and IV. While such a relationship was not satisfied in regime III, which can be attributed to the formation of molten PE film in the burnt wire side as well as the formation of globular molten PE in front of spreading flame edge, emphasizing the important role of complex molten PE behavior. Molten PE dripping was observed for NiCr-core, while for Cu-core, such dripping was not observed. Electrospray and di-electrophoresis phenomena occurred with Cu-core along with a formation of molten PE film on the burnt wire side via continuous di-electrophoresis phenomenon from molten PE droplet. When the frequency was excessive, flame extinction occurred via two routes: appreciable reduction of flame size (both for Cu- and NiCr-cores) and detachment of molten PE (for Cu-core). These extinction frequencies were correlated well with the voltage.Citation
Kang, M. S., Park, S. H., Yoo, C. S., Park, J., & Chung, S. H. (2020). Effect of core metal on flame spread and extinction for horizontal electrical wire with applied AC electric fields. Proceedings of the Combustion Institute. doi:10.1016/j.proci.2020.05.060Sponsors
This work was conducted under the framework of the Research and Development Program of the Korea Institute of Energy Research (B9-2431). SHC was supported by the King Abdullah University of Science and Technology (KAUST). CSY was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2018R1A2A2A05018901).Publisher
Elsevier BVAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S1540748920304624ae974a485f413a2113503eed53cd6c53
10.1016/j.proci.2020.05.060