Academic Journal
Effect of AC electric field on flame spread in electrical wire: Variation in polyethylene insulation thickness and di-electrophoresis phenomenon
| العنوان: | Effect of AC electric field on flame spread in electrical wire: Variation in polyethylene insulation thickness and di-electrophoresis phenomenon |
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| المؤلفون: | Park, Sun Ho, Lim, Seung Jae, Cha, Min Suk, Park, Jeong, Chung, Suk Ho |
| المساهمون: | Clean Combustion Research Center, Combustion and Laser Diagnostics Laboratory, Mechanical Engineering Program, Physical Science and Engineering (PSE) Division, Department of Mechanical Engineering, Pukyong National University, Busan, Republic of Korea, Department of Mechanical Engineering, University of South Carolina, Columbia, USA |
| بيانات النشر: | Elsevier BV |
| سنة النشر: | 2019 |
| المجموعة: | King Abdullah University of Science and Technology: KAUST Repository |
| مصطلحات موضوعية: | Flame spread, Electrical wire, AC electric field, Di-electrophoresis, Electrospray |
| الوصف: | The effect of AC electric field on flame spread over polyethylene (PE)-insulated electrical wire was experimentally investigated by varying the applied AC voltage (VAC) and frequency (fAC) with special attention to the effect of the thickness of the PE insulation material (Tins). The diameter of the Ni–Cr wire was 0.5 mm and Tins was 0.15, 0.3, and 0.5 mm, yielding outer diameters (Dout) of 0.8, 1.1, and 1.5 mm, respectively. For the baseline cases with no electric field, the flame spread rate (FSR) (flame size) decreased (increased) with insulation thickness. Both FSR and flame size were appreciably influenced by applied AC electric fields. The FSR behaviors under applied electric fields could be classified into three sub-regimes as AC frequency increased: regime I exhibited a decreasing FSR as AC frequency increased, regime II exhibited an increasing FSR, and regime III again exhibited a decreasing FSR. Molten PE dripped from the wire (resulting in mass loss); exhibited di-electrophoresis (some molten PE moved from the main molten zone toward the burnt wire, forming globules in the process); and developed electrosprays (ejection of small droplets from the molten PE surface). For Dout = 0.8 mm, the FSR behavior was similar to that of the flame width, such that the behavior could be explained by the thermal balance mechanism. When a low voltage and high frequency were applied to wires with Dout = 1.1 and 1.5 mm, molten PE droplets detached and moved to the burnt wires continuously (although sometimes intermittently) from the main body of molten PE; the FSR behavior thus deviated from that of regime I. Droplet detachment was attributable to a di-electrophoresis. The distance moved correlated well with the difference in electric field intensities of burnt and unburned wires. Appreciable dripping of molten PE occurred at high voltages and moderate frequencies in regime II. When the frequency was excessive, flame extinction occurred via two routes: appreciable reduction of flame size when Dout = 0.8 mm in regime I ... |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | unknown |
| تدمد: | 0010-2180 |
| Relation: | https://www.sciencedirect.com/science/article/pii/S0010218019300185; Park SH, Lim SJ, Cha MS, Park J, Chung SH (2019) Effect of AC electric field on flame spread in electrical wire: Variation in polyethylene insulation thickness and di-electrophoresis phenomenon. Combustion and Flame 202: 107–118. Available: http://dx.doi.org/10.1016/j.combustflame.2019.01.007.; Combustion and Flame; http://hdl.handle.net/10754/631164 |
| DOI: | 10.1016/j.combustflame.2019.01.007 |
| الاتاحة: | http://hdl.handle.net/10754/631164 https://doi.org/10.1016/j.combustflame.2019.01.007 |
| Rights: | NOTICE: this is the author’s version of a work that was accepted for publication in Combustion and Flame. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Combustion and Flame, [, , (2019-01-22)] DOI:10.1016/j.combustflame.2019.01.007 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| رقم الانضمام: | edsbas.F1FD2D9E |
| قاعدة البيانات: | BASE |
| تدمد: | 00102180 |
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| DOI: | 10.1016/j.combustflame.2019.01.007 |