Thermal Model for Timber Fire Exposure with Moving Boundary
Fire exposure of timber leads to charring, surface cracking and timber burnout, shifting the external thermal load deeper into the timber domain. This phenomenon plays its role mainly in situations of longer fire exposure. The majority of current approaches and models assume initial geometry during...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-01-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/3/574 |
| _version_ | 1797407159046111232 |
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| author | Stanislav Šulc Vít Šmilauer František Wald |
| author_facet | Stanislav Šulc Vít Šmilauer František Wald |
| author_sort | Stanislav Šulc |
| collection | DOAJ |
| description | Fire exposure of timber leads to charring, surface cracking and timber burnout, shifting the external thermal load deeper into the timber domain. This phenomenon plays its role mainly in situations of longer fire exposure. The majority of current approaches and models assume initial geometry during the whole analysis, leading generally to the overestimation of the insulation effect of the charred layer and to a limited burnout. This paper presents a heat transport model which is supplemented with a moving boundary condition, a criterion for the finite element deactivation and the internal heat source. Comparison with experiments using a constant radiative load testifies that the moving boundary condition becomes important after approximately 10 min of fire exposure and rather leads to a constant charring rate observed in several experiments. |
| first_indexed | 2024-03-09T03:37:07Z |
| format | Article |
| id | doaj.art-09e58a84a10e444d85008d6c6a1afd79 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T03:37:07Z |
| publishDate | 2021-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-09e58a84a10e444d85008d6c6a1afd792023-12-03T14:45:56ZengMDPI AGMaterials1996-19442021-01-0114357410.3390/ma14030574Thermal Model for Timber Fire Exposure with Moving BoundaryStanislav Šulc0Vít Šmilauer1František Wald2Faculty of Civil Engineering, Department of Mechanics, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicFaculty of Civil Engineering, Department of Mechanics, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicFaculty of Civil Engineering, Department of Steel and Timber Structures, Czech Technical University in Prague, Thákurova 7, 166 29 Prague, Czech RepublicFire exposure of timber leads to charring, surface cracking and timber burnout, shifting the external thermal load deeper into the timber domain. This phenomenon plays its role mainly in situations of longer fire exposure. The majority of current approaches and models assume initial geometry during the whole analysis, leading generally to the overestimation of the insulation effect of the charred layer and to a limited burnout. This paper presents a heat transport model which is supplemented with a moving boundary condition, a criterion for the finite element deactivation and the internal heat source. Comparison with experiments using a constant radiative load testifies that the moving boundary condition becomes important after approximately 10 min of fire exposure and rather leads to a constant charring rate observed in several experiments.https://www.mdpi.com/1996-1944/14/3/574charring ratetimberadvancing frontmoving boundary conditionburnoutadiabatic surface temperature |
| spellingShingle | Stanislav Šulc Vít Šmilauer František Wald Thermal Model for Timber Fire Exposure with Moving Boundary Materials charring rate timber advancing front moving boundary condition burnout adiabatic surface temperature |
| title | Thermal Model for Timber Fire Exposure with Moving Boundary |
| title_full | Thermal Model for Timber Fire Exposure with Moving Boundary |
| title_fullStr | Thermal Model for Timber Fire Exposure with Moving Boundary |
| title_full_unstemmed | Thermal Model for Timber Fire Exposure with Moving Boundary |
| title_short | Thermal Model for Timber Fire Exposure with Moving Boundary |
| title_sort | thermal model for timber fire exposure with moving boundary |
| topic | charring rate timber advancing front moving boundary condition burnout adiabatic surface temperature |
| url | https://www.mdpi.com/1996-1944/14/3/574 |
| work_keys_str_mv | AT stanislavsulc thermalmodelfortimberfireexposurewithmovingboundary AT vitsmilauer thermalmodelfortimberfireexposurewithmovingboundary AT frantisekwald thermalmodelfortimberfireexposurewithmovingboundary |