Experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudes
Experimental and numerical study on upward, vertical flame spread was carried out on expanded polystyrene (EPS) at two different altitudes of 50 m and 3658 m to understand the effect that altitude has on flame spread of melted material. The experiments show that, with the altitude increase, the flam...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2021-12-01
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| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X21007863 |
| _version_ | 1831713664926744576 |
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| author | Xinjie Huang Gongjian Chen Zhijie Zhou Junjie Hu Changlong Wang Depeng Chen |
| author_facet | Xinjie Huang Gongjian Chen Zhijie Zhou Junjie Hu Changlong Wang Depeng Chen |
| author_sort | Xinjie Huang |
| collection | DOAJ |
| description | Experimental and numerical study on upward, vertical flame spread was carried out on expanded polystyrene (EPS) at two different altitudes of 50 m and 3658 m to understand the effect that altitude has on flame spread of melted material. The experiments show that, with the altitude increase, the flame spread rate would decrease. At low altitude, the flame spread rate accelerated at later time, while at high altitude, the stagnant stage of pyrolysis front was formed. The numerical simulation could well give the trend of pyrolysis front evolution and the different flame spread behaviors with altitudes. It was found that, at low altitude, Raxincreased slowly in the turbulent period with relatively large entrainment air flow rate, mainly due to the increased and then decreased mass loss rate in the wall fire zone. While, at high altitude, the simulated increasing entrainment air flow rate, combined with the larger preheating length δf and the smaller flame heat flux qf'', resulted in the stagnancy of pyrolysis front easily. It was hypothesized that extinction occurred eventually at high altitude due to competition between flame spread rate νf and preheating length δf. |
| first_indexed | 2024-12-20T23:45:04Z |
| format | Article |
| id | doaj.art-63f63d4964284623b93c2275a58a3362 |
| institution | Directory Open Access Journal |
| issn | 2214-157X |
| language | English |
| last_indexed | 2024-12-20T23:45:04Z |
| publishDate | 2021-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj.art-63f63d4964284623b93c2275a58a33622022-12-21T19:22:58ZengElsevierCase Studies in Thermal Engineering2214-157X2021-12-0128101623Experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudesXinjie Huang0Gongjian Chen1Zhijie Zhou2Junjie Hu3Changlong Wang4Depeng Chen5School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui, 243002, China; School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China; Corresponding author. School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui, 243002, China.School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui, 243002, ChinaSchool of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui, 243002, ChinaSchool of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui, 243002, ChinaSchool of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui, 243002, ChinaSchool of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui, 243002, ChinaExperimental and numerical study on upward, vertical flame spread was carried out on expanded polystyrene (EPS) at two different altitudes of 50 m and 3658 m to understand the effect that altitude has on flame spread of melted material. The experiments show that, with the altitude increase, the flame spread rate would decrease. At low altitude, the flame spread rate accelerated at later time, while at high altitude, the stagnant stage of pyrolysis front was formed. The numerical simulation could well give the trend of pyrolysis front evolution and the different flame spread behaviors with altitudes. It was found that, at low altitude, Raxincreased slowly in the turbulent period with relatively large entrainment air flow rate, mainly due to the increased and then decreased mass loss rate in the wall fire zone. While, at high altitude, the simulated increasing entrainment air flow rate, combined with the larger preheating length δf and the smaller flame heat flux qf'', resulted in the stagnancy of pyrolysis front easily. It was hypothesized that extinction occurred eventually at high altitude due to competition between flame spread rate νf and preheating length δf.http://www.sciencedirect.com/science/article/pii/S2214157X21007863Upward flame spreadNumerical simulationHeat transferExpanded polystyreneAltitude |
| spellingShingle | Xinjie Huang Gongjian Chen Zhijie Zhou Junjie Hu Changlong Wang Depeng Chen Experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudes Case Studies in Thermal Engineering Upward flame spread Numerical simulation Heat transfer Expanded polystyrene Altitude |
| title | Experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudes |
| title_full | Experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudes |
| title_fullStr | Experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudes |
| title_full_unstemmed | Experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudes |
| title_short | Experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudes |
| title_sort | experimental and numerical study of upward flame spread and heat transfer over expanded polystyrene at different altitudes |
| topic | Upward flame spread Numerical simulation Heat transfer Expanded polystyrene Altitude |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X21007863 |
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