Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation
Reliable predictions from numerical simulations in fire safety applications require knowledge of the combustible materials’ properties in their initial and thermally degraded states. The thermal conductivity of the sheath material of electrical cables, present in massive amounts in industrial plants...
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| Format: | Article |
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MDPI AG
2020-11-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/13/22/5258 |
| _version_ | 1797547284053884928 |
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| author | Jianwei Shi Germain Boyer Valeri Mourzenko Jean-François Thovert |
| author_facet | Jianwei Shi Germain Boyer Valeri Mourzenko Jean-François Thovert |
| author_sort | Jianwei Shi |
| collection | DOAJ |
| description | Reliable predictions from numerical simulations in fire safety applications require knowledge of the combustible materials’ properties in their initial and thermally degraded states. The thermal conductivity of the sheath material of electrical cables, present in massive amounts in industrial plants, is addressed here. An evolutive conceptual model is proposed for the morphology of this intumescent polymer composite during its thermal degradation. It accounts for the multiscale structure and anisotropy observed during a thorough characterization based on tomographic images of samples at representative stages of the degradation. The evolution of the geometrical characteristics during the process is linked to chemical advancement parameters according to a reasoned scenario based on physical arguments and balance considerations. The anisotropic thermal conductivity tensor can be deduced from the geometry by a nested application of classical models. Ultimately, the conductivity is obtained as an analytic function of the chemical advancement and temperature. The model predictions were validated by comparisons with direct numerical solutions of thermal problems in the fully described geometry provided by the tomographies, and with measurements from the literature. The methodology and conceptual tools can be of interest for the treatment of other materials and in other contexts of application. |
| first_indexed | 2024-03-10T14:41:07Z |
| format | Article |
| id | doaj.art-924cb51c5686407e84c033f506c5f264 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T14:41:07Z |
| publishDate | 2020-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-924cb51c5686407e84c033f506c5f2642023-11-20T21:45:39ZengMDPI AGMaterials1996-19442020-11-011322525810.3390/ma13225258Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal DegradationJianwei Shi0Germain Boyer1Valeri Mourzenko2Jean-François Thovert3Institut P’, CNRS—Université de Poitiers—ISAE-ENSMA, 11 bd Marie et Pierre Curie, TSA 41123, CEDEX 09, 86073 Poitiers, FranceInstitut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES/SA2I/LIE, Cadarache, 13115 St Paul Lez Durance, FranceInstitut P’, CNRS—Université de Poitiers—ISAE-ENSMA, 11 bd Marie et Pierre Curie, TSA 41123, CEDEX 09, 86073 Poitiers, FranceInstitut P’, CNRS—Université de Poitiers—ISAE-ENSMA, 11 bd Marie et Pierre Curie, TSA 41123, CEDEX 09, 86073 Poitiers, FranceReliable predictions from numerical simulations in fire safety applications require knowledge of the combustible materials’ properties in their initial and thermally degraded states. The thermal conductivity of the sheath material of electrical cables, present in massive amounts in industrial plants, is addressed here. An evolutive conceptual model is proposed for the morphology of this intumescent polymer composite during its thermal degradation. It accounts for the multiscale structure and anisotropy observed during a thorough characterization based on tomographic images of samples at representative stages of the degradation. The evolution of the geometrical characteristics during the process is linked to chemical advancement parameters according to a reasoned scenario based on physical arguments and balance considerations. The anisotropic thermal conductivity tensor can be deduced from the geometry by a nested application of classical models. Ultimately, the conductivity is obtained as an analytic function of the chemical advancement and temperature. The model predictions were validated by comparisons with direct numerical solutions of thermal problems in the fully described geometry provided by the tomographies, and with measurements from the literature. The methodology and conceptual tools can be of interest for the treatment of other materials and in other contexts of application.https://www.mdpi.com/1996-1944/13/22/5258intumescent polymercompositethermal degradationmorphologythermal conductivityconceptual modeling |
| spellingShingle | Jianwei Shi Germain Boyer Valeri Mourzenko Jean-François Thovert Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation Materials intumescent polymer composite thermal degradation morphology thermal conductivity conceptual modeling |
| title | Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation |
| title_full | Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation |
| title_fullStr | Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation |
| title_full_unstemmed | Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation |
| title_short | Evolutive Models for the Geometry and Heat Conductivity of an Intumescent EVA-ATH Composite during Its Thermal Degradation |
| title_sort | evolutive models for the geometry and heat conductivity of an intumescent eva ath composite during its thermal degradation |
| topic | intumescent polymer composite thermal degradation morphology thermal conductivity conceptual modeling |
| url | https://www.mdpi.com/1996-1944/13/22/5258 |
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