Experimental and modeling research on thermal radiation characteristics of glowing contact in electrical fires
Poor electrical contact is one of the main reasons for electrical fires. Glowing contact triggered by poor contact can reach high temperature on electrical wires. The peak temperature can be up to 1,000 °C. Thus, the radiative thermal hazards of glowing contact cannot be ignored. In this study, the...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
|
| Series: | Case Studies in Thermal Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214157X25003375 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849314362064371712 |
|---|---|
| author | Jing Zhang Wenhui Ju Tao Chen Guofeng Su Changzheng Li Wenzhong Mi |
| author_facet | Jing Zhang Wenhui Ju Tao Chen Guofeng Su Changzheng Li Wenzhong Mi |
| author_sort | Jing Zhang |
| collection | DOAJ |
| description | Poor electrical contact is one of the main reasons for electrical fires. Glowing contact triggered by poor contact can reach high temperature on electrical wires. The peak temperature can be up to 1,000 °C. Thus, the radiative thermal hazards of glowing contact cannot be ignored. In this study, the radiative heat flux of glowing contact is measured and quantified. A thermo-electrical Multiphysics model of glowing contact describes the distribution of the radiative heat intensity. An empirical model of radiation heat flux of glowing contact is obtained by two-step fitting based on the simulation data. Results demonstrate that the radiative heat flux of glowing contact decreases with distance and increases with time. PVC insulation layers are exposed to high fire risk when the distance between glowing contact and PVC is within 7 mm. Simulation results show that the contour lines of radiation are approximately elliptical due to the slender cylindrical glowing oxide bridge. The two-dimensional Gaussian distribution is applied to fit the simulation data. It can be utilized for studies on glowing contact’s ignition characteristics. |
| format | Article |
| id | doaj-art-c6a371a9bd3747ad920fd6d6bb72fef2 |
| institution | Kabale University |
| issn | 2214-157X |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Thermal Engineering |
| spelling | doaj-art-c6a371a9bd3747ad920fd6d6bb72fef22025-08-20T03:52:28ZengElsevierCase Studies in Thermal Engineering2214-157X2025-06-017010607710.1016/j.csite.2025.106077Experimental and modeling research on thermal radiation characteristics of glowing contact in electrical firesJing Zhang0Wenhui Ju1Tao Chen2Guofeng Su3Changzheng Li4Wenzhong Mi5School of Safety Science, Tsinghua University, Beijing, 100084, China; Key Laboratory of Investigation and Evaluation on Natural Hazards and Industrial Accidents, Ministry of Emergency Management, Beijing, 100084, ChinaPeople’s Insurance Company(Group) of China Limited, Beijing, 100031, ChinaSchool of Safety Science, Tsinghua University, Beijing, 100084, China; Key Laboratory of Investigation and Evaluation on Natural Hazards and Industrial Accidents, Ministry of Emergency Management, Beijing, 100084, ChinaSchool of Safety Science, Tsinghua University, Beijing, 100084, China; Key Laboratory of Investigation and Evaluation on Natural Hazards and Industrial Accidents, Ministry of Emergency Management, Beijing, 100084, China; Disaster Accident Investigation Technology Center, Hefei Institute for Public Safety Research, Tsinghua University, Hefei, 230601, China; Corresponding author at: School of Safety Science, Tsinghua University, Beijing, 100084, China.Disaster Accident Investigation Technology Center, Hefei Institute for Public Safety Research, Tsinghua University, Hefei, 230601, ChinaSchool of Safety Science, Tsinghua University, Beijing, 100084, China; Key Laboratory of Investigation and Evaluation on Natural Hazards and Industrial Accidents, Ministry of Emergency Management, Beijing, 100084, China; Disaster Accident Investigation Technology Center, Hefei Institute for Public Safety Research, Tsinghua University, Hefei, 230601, ChinaPoor electrical contact is one of the main reasons for electrical fires. Glowing contact triggered by poor contact can reach high temperature on electrical wires. The peak temperature can be up to 1,000 °C. Thus, the radiative thermal hazards of glowing contact cannot be ignored. In this study, the radiative heat flux of glowing contact is measured and quantified. A thermo-electrical Multiphysics model of glowing contact describes the distribution of the radiative heat intensity. An empirical model of radiation heat flux of glowing contact is obtained by two-step fitting based on the simulation data. Results demonstrate that the radiative heat flux of glowing contact decreases with distance and increases with time. PVC insulation layers are exposed to high fire risk when the distance between glowing contact and PVC is within 7 mm. Simulation results show that the contour lines of radiation are approximately elliptical due to the slender cylindrical glowing oxide bridge. The two-dimensional Gaussian distribution is applied to fit the simulation data. It can be utilized for studies on glowing contact’s ignition characteristics.http://www.sciencedirect.com/science/article/pii/S2214157X25003375Electrical firesPoor electrical contactsGlowing contactsThermal radiation measurementMultiphysics |
| spellingShingle | Jing Zhang Wenhui Ju Tao Chen Guofeng Su Changzheng Li Wenzhong Mi Experimental and modeling research on thermal radiation characteristics of glowing contact in electrical fires Case Studies in Thermal Engineering Electrical fires Poor electrical contacts Glowing contacts Thermal radiation measurement Multiphysics |
| title | Experimental and modeling research on thermal radiation characteristics of glowing contact in electrical fires |
| title_full | Experimental and modeling research on thermal radiation characteristics of glowing contact in electrical fires |
| title_fullStr | Experimental and modeling research on thermal radiation characteristics of glowing contact in electrical fires |
| title_full_unstemmed | Experimental and modeling research on thermal radiation characteristics of glowing contact in electrical fires |
| title_short | Experimental and modeling research on thermal radiation characteristics of glowing contact in electrical fires |
| title_sort | experimental and modeling research on thermal radiation characteristics of glowing contact in electrical fires |
| topic | Electrical fires Poor electrical contacts Glowing contacts Thermal radiation measurement Multiphysics |
| url | http://www.sciencedirect.com/science/article/pii/S2214157X25003375 |
| work_keys_str_mv | AT jingzhang experimentalandmodelingresearchonthermalradiationcharacteristicsofglowingcontactinelectricalfires AT wenhuiju experimentalandmodelingresearchonthermalradiationcharacteristicsofglowingcontactinelectricalfires AT taochen experimentalandmodelingresearchonthermalradiationcharacteristicsofglowingcontactinelectricalfires AT guofengsu experimentalandmodelingresearchonthermalradiationcharacteristicsofglowingcontactinelectricalfires AT changzhengli experimentalandmodelingresearchonthermalradiationcharacteristicsofglowingcontactinelectricalfires AT wenzhongmi experimentalandmodelingresearchonthermalradiationcharacteristicsofglowingcontactinelectricalfires |