Pub Date : 2023-06-20DOI: 10.1177/07349041231175344
Chenran Fan, Lijuan Wei, Shicheng Zhao
To improve the flame retardant efficiency of intumescent flame retardants, some nano-scale additives as synergists were always added. In this work, nano silicon and piperazine pyrophosphate/melamine polyphosphate into polypropylene was investigated, which was obviously efficient to improve thermal stability and flame retardancy. The optimal synergistic ratio corresponded to 1 wt% SiO2, 10 wt% piperazine pyrophosphate, and 5 wt% melamine polyphosphate. The system passed the UL-94 V-1 classification and had a limiting oxygen index value of 34.5%. It exhibited a decrease on peak heat release rate and peak smoke production rate by 81% and 80%, respectively. Based on characterizations of scanning electron microscope, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, the synergistic mechanism was investigated. A reactive cross-linking network between SiO2 and piperazine pyrophosphate/melamine polyphosphate during burning was formed to enhance the structure of carbon protective layer. Nano silicon acted as a foaming nucleating agent to promote the formation of porous dense carbon layer in intumescent flame retardants during burning. The synergistic strategy of SiO2 and piperazine pyrophosphate/melamine polyphosphate provided new compounded system for the design of polymeric materials with excellent flame retardancy, great thermal stability, and low release of heat and smoke.
{"title":"Synergistic effect of nano silicon and piperazine pyrophosphate/melamine polyphosphate on flame retardancy of polypropylene","authors":"Chenran Fan, Lijuan Wei, Shicheng Zhao","doi":"10.1177/07349041231175344","DOIUrl":"https://doi.org/10.1177/07349041231175344","url":null,"abstract":"To improve the flame retardant efficiency of intumescent flame retardants, some nano-scale additives as synergists were always added. In this work, nano silicon and piperazine pyrophosphate/melamine polyphosphate into polypropylene was investigated, which was obviously efficient to improve thermal stability and flame retardancy. The optimal synergistic ratio corresponded to 1 wt% SiO2, 10 wt% piperazine pyrophosphate, and 5 wt% melamine polyphosphate. The system passed the UL-94 V-1 classification and had a limiting oxygen index value of 34.5%. It exhibited a decrease on peak heat release rate and peak smoke production rate by 81% and 80%, respectively. Based on characterizations of scanning electron microscope, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, the synergistic mechanism was investigated. A reactive cross-linking network between SiO2 and piperazine pyrophosphate/melamine polyphosphate during burning was formed to enhance the structure of carbon protective layer. Nano silicon acted as a foaming nucleating agent to promote the formation of porous dense carbon layer in intumescent flame retardants during burning. The synergistic strategy of SiO2 and piperazine pyrophosphate/melamine polyphosphate provided new compounded system for the design of polymeric materials with excellent flame retardancy, great thermal stability, and low release of heat and smoke.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41666331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-06DOI: 10.1177/07349041231177183
Manon Fleurotte, G. Debenest, O. Authier, G. Fontaine, S. Bourbigot, A. Amokrane
Modelling the swelling behaviour of intumescent materials is an important and challenging issue because this phenomenon influences their pyrolysis process. It must be therefore considered to improve the predictability of pyrolysis models. The objective of this work was to implement a swelling model in the pyrolysis code Gpyro in order to predict the behaviour of a sample of ethylene vinyl acetate containing aluminium trihydroxide (EVA/ATH) polymer studied by cone calorimetry. This polymer is used for making the external sheath of electrical cables. Unlike existing works in the literature, the model implemented here, and adapted to EVA/ATH, does not require information on the densities of the initial and final materials, which makes it more predictive. To characterize the swelling, experiments were carried out to measure the evolution of the sample thickness as a function of time. The mass loss and the back surface temperature of the sample were also measured. This was done under different operating conditions. These measurements are compared with the swelling predicted by the model and the results were found to be in good agreement. The model can be extended easily to other materials.
{"title":"Modelling of the swelling behaviour of a fire retarded material under a cone calorimeter","authors":"Manon Fleurotte, G. Debenest, O. Authier, G. Fontaine, S. Bourbigot, A. Amokrane","doi":"10.1177/07349041231177183","DOIUrl":"https://doi.org/10.1177/07349041231177183","url":null,"abstract":"Modelling the swelling behaviour of intumescent materials is an important and challenging issue because this phenomenon influences their pyrolysis process. It must be therefore considered to improve the predictability of pyrolysis models. The objective of this work was to implement a swelling model in the pyrolysis code Gpyro in order to predict the behaviour of a sample of ethylene vinyl acetate containing aluminium trihydroxide (EVA/ATH) polymer studied by cone calorimetry. This polymer is used for making the external sheath of electrical cables. Unlike existing works in the literature, the model implemented here, and adapted to EVA/ATH, does not require information on the densities of the initial and final materials, which makes it more predictive. To characterize the swelling, experiments were carried out to measure the evolution of the sample thickness as a function of time. The mass loss and the back surface temperature of the sample were also measured. This was done under different operating conditions. These measurements are compared with the swelling predicted by the model and the results were found to be in good agreement. The model can be extended easily to other materials.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48198010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-05-06DOI: 10.1177/07349041231171349
Vincent N Mokoana, J. Asante, O. J. Okonkwo
Polymeric textile materials, now, find extensive application in modern society than previously imagined, particularly in protective clothing. The application of these polymeric materials has been restricted by their flammability and contribution to fire risk. Flame retarding compounds and inherent flame-retardant materials have been introduced to reduce and even halt the flammability of polymers. However, over time, flame retardants tend to leach out of materials. The exposure of polymer textile to varying heat intensities may trigger polymer and flame retardant’s volatilization and thermal degradation. Firefighters may be exposed to toxic chemicals through the volatilization of flame-retardant compounds from the bunker gear. Flame retardant’s volatilization is associated with thermal degradation of the flame-retardant chemical compounds in the textile material. This review focuses on volatilization of flame retardants from protective textile materials resulting from exposure to heat and seeks to provide the necessary understanding about the release of flame retardants from flame-retardant textiles, particularly firefighting garments.
{"title":"A review on volatilization of flame retarding compounds from polymeric textile materials used in firefighter protective garment","authors":"Vincent N Mokoana, J. Asante, O. J. Okonkwo","doi":"10.1177/07349041231171349","DOIUrl":"https://doi.org/10.1177/07349041231171349","url":null,"abstract":"Polymeric textile materials, now, find extensive application in modern society than previously imagined, particularly in protective clothing. The application of these polymeric materials has been restricted by their flammability and contribution to fire risk. Flame retarding compounds and inherent flame-retardant materials have been introduced to reduce and even halt the flammability of polymers. However, over time, flame retardants tend to leach out of materials. The exposure of polymer textile to varying heat intensities may trigger polymer and flame retardant’s volatilization and thermal degradation. Firefighters may be exposed to toxic chemicals through the volatilization of flame-retardant compounds from the bunker gear. Flame retardant’s volatilization is associated with thermal degradation of the flame-retardant chemical compounds in the textile material. This review focuses on volatilization of flame retardants from protective textile materials resulting from exposure to heat and seeks to provide the necessary understanding about the release of flame retardants from flame-retardant textiles, particularly firefighting garments.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46781185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-24DOI: 10.1177/07349041231168553
Nuttabodee Viriyawattana, Surachat Sinworn
Herein, we investigated nanocalcium silicate (nCa2SiO4) prepared from clam shells and rice husks for its utilisation as a chemical agent in a fire-extinguishing mixture comprising ABC dry powder. The fire-extinguishing performance was evaluated with Class A and B fires. The prepared mixture was compared with commercial mono-ammonium phosphate powder based on different parameters, namely extinguishing time, amount of extinguishing agent used, fire temperature reduction rate, powder coating on the fuel and a reburn incident. It was found that the mixture of nCa2SiO4 and ABC dry powder could extinguish Class A and B fires within 10.67 and 9 s, respectively, while commercial mono-ammonium phosphate powder required 11 and 11.33 s to extinguish Class A and B fires, respectively. Thus, the mixture of nCa2SiO4 and ABC dry powder was more effective and less consumed as compared to commercial mono-ammonium phosphate powder (Class B only). This study demonstrates the efficacy of nCa2SiO4 to improve the performance of dry chemical-based fire extinguishers.
{"title":"Performance improvement of the dry chemical-based fire extinguishers using nanocalcium silicate synthesised from biowaste","authors":"Nuttabodee Viriyawattana, Surachat Sinworn","doi":"10.1177/07349041231168553","DOIUrl":"https://doi.org/10.1177/07349041231168553","url":null,"abstract":"Herein, we investigated nanocalcium silicate (nCa2SiO4) prepared from clam shells and rice husks for its utilisation as a chemical agent in a fire-extinguishing mixture comprising ABC dry powder. The fire-extinguishing performance was evaluated with Class A and B fires. The prepared mixture was compared with commercial mono-ammonium phosphate powder based on different parameters, namely extinguishing time, amount of extinguishing agent used, fire temperature reduction rate, powder coating on the fuel and a reburn incident. It was found that the mixture of nCa2SiO4 and ABC dry powder could extinguish Class A and B fires within 10.67 and 9 s, respectively, while commercial mono-ammonium phosphate powder required 11 and 11.33 s to extinguish Class A and B fires, respectively. Thus, the mixture of nCa2SiO4 and ABC dry powder was more effective and less consumed as compared to commercial mono-ammonium phosphate powder (Class B only). This study demonstrates the efficacy of nCa2SiO4 to improve the performance of dry chemical-based fire extinguishers.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49324714","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-19DOI: 10.1177/07349041231168554
J. Przybysz, M. Celiński, P. Kozikowski, K. Mizera, M. Borucka, Agnieszka Gajek
Wood dust consists of the fine particles of wood that are produced when wood is processed. It is considered explosive, especially if it produces a dust cloud. Initiating the combustion process inside the dust–air cloud spreads this process throughout the entire volume. In this article, experiment was carried out to study the influence of type of hardwood on combustion parameters. An experimental investigation was carried out to determine the evolution of the ignition sensitivity, fire behaviour and explosion characteristics of three types of hardwood dust. To determine dust behaviour under fire conditions, a cone calorimeter was used. Explosion characteristics were tested with the use of a 20 L spherical vessel and minimum ignition energy tested on MINOR II Apparatus, which is a modified Hartmann’s Tube. Studies have shown a large effect of particle size on explosion parameters, while for flammability parameters the effect is not so noticeable.
{"title":"Flammability and explosion characteristics of hardwood dust","authors":"J. Przybysz, M. Celiński, P. Kozikowski, K. Mizera, M. Borucka, Agnieszka Gajek","doi":"10.1177/07349041231168554","DOIUrl":"https://doi.org/10.1177/07349041231168554","url":null,"abstract":"Wood dust consists of the fine particles of wood that are produced when wood is processed. It is considered explosive, especially if it produces a dust cloud. Initiating the combustion process inside the dust–air cloud spreads this process throughout the entire volume. In this article, experiment was carried out to study the influence of type of hardwood on combustion parameters. An experimental investigation was carried out to determine the evolution of the ignition sensitivity, fire behaviour and explosion characteristics of three types of hardwood dust. To determine dust behaviour under fire conditions, a cone calorimeter was used. Explosion characteristics were tested with the use of a 20 L spherical vessel and minimum ignition energy tested on MINOR II Apparatus, which is a modified Hartmann’s Tube. Studies have shown a large effect of particle size on explosion parameters, while for flammability parameters the effect is not so noticeable.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46664143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-18DOI: 10.1177/07349041231163451
A. Fernandes, Andrei Borissovitch Utkin, Paulo Chaves
The ability of EfficientDet, a framework developed in 2019 for object detection, to automatically detect smoke plumes at a distance of several kilometers is demonstrated. Recent articles have raised concerns about the effectiveness of EfficientDet in fire detection applications, with over 40% of false positives reported. The proposed EfficientDet model achieved a true detection rate of 80.4% and a false-positive rate of 1.13% on a testing set. The data set used in this study, which includes 14,125 smoke and 21,203 non-smoke images, is one of the largest, or even the largest, of its kind reported in the literature for images containing smoke plumes. Our results surpass those of a previous study that used the same data set and are more reliable and realistic than those reported by others, which may seem better, but were calculated using smaller and less representative data sets.
{"title":"Automatic early detection of wildfire smoke with visible-light cameras and EfficientDet","authors":"A. Fernandes, Andrei Borissovitch Utkin, Paulo Chaves","doi":"10.1177/07349041231163451","DOIUrl":"https://doi.org/10.1177/07349041231163451","url":null,"abstract":"The ability of EfficientDet, a framework developed in 2019 for object detection, to automatically detect smoke plumes at a distance of several kilometers is demonstrated. Recent articles have raised concerns about the effectiveness of EfficientDet in fire detection applications, with over 40% of false positives reported. The proposed EfficientDet model achieved a true detection rate of 80.4% and a false-positive rate of 1.13% on a testing set. The data set used in this study, which includes 14,125 smoke and 21,203 non-smoke images, is one of the largest, or even the largest, of its kind reported in the literature for images containing smoke plumes. Our results surpass those of a previous study that used the same data set and are more reliable and realistic than those reported by others, which may seem better, but were calculated using smaller and less representative data sets.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42924372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-23DOI: 10.1177/07349041231161493
B. Howell
As the development and use of organophosphorus flame retardants have become more prevalent, concerns about potential toxicity are being raised. To date, most studies on potential toxicity have focused on simple phosphate esters and often include both alkyl and aryl esters or, in some cases, even halogenated phosphate esters (which should more properly be included among organohalogen flame retardants). The inclusion of several kinds of esters into a single study leads to muddled conclusions. Each class of phosphate esters should be subjected to toxicity assessment separately. Furthermore, the potential toxicity of the more effective (lower level of oxygenation at phosphorus: phosphonates, phosphinates, phosphine oxides) organophosphorus flame retardants has been little explored. The few results available suggest that these compounds exhibit no or minimal toxicity (lower than that of phosphates?). This represents an area that should be the focus of careful detailed studies to establish any potential toxicity.
{"title":"Toxicity of organophosphorus flame retardants","authors":"B. Howell","doi":"10.1177/07349041231161493","DOIUrl":"https://doi.org/10.1177/07349041231161493","url":null,"abstract":"As the development and use of organophosphorus flame retardants have become more prevalent, concerns about potential toxicity are being raised. To date, most studies on potential toxicity have focused on simple phosphate esters and often include both alkyl and aryl esters or, in some cases, even halogenated phosphate esters (which should more properly be included among organohalogen flame retardants). The inclusion of several kinds of esters into a single study leads to muddled conclusions. Each class of phosphate esters should be subjected to toxicity assessment separately. Furthermore, the potential toxicity of the more effective (lower level of oxygenation at phosphorus: phosphonates, phosphinates, phosphine oxides) organophosphorus flame retardants has been little explored. The few results available suggest that these compounds exhibit no or minimal toxicity (lower than that of phosphates?). This represents an area that should be the focus of careful detailed studies to establish any potential toxicity.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43734640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-07DOI: 10.1177/07349041231158990
T. Nazé, F. Poutch, F. Bonnet, M. Jimenez, S. Bourbigot
Additive manufacturing, including fused deposition modelling, is a growing technology opening up wide perspectives in material sciences. However, the ability to produce suitable fire-retarded materials via this process has never been studied extensively. This work focuses on understanding the relation between reaction to fire and numerous additive manufacturing parameters. The goal was to determine the impact of those parameters on standard fire tests such as flame propagation test (UL94V) and cone calorimetry. The results were compared with material samples formulated via usual processes. On one hand, flame propagation results are impacted by many additive manufacturing parameters, such as the design of the part and the material flow. On the other hand, cone calorimeter results are only influenced by parameters having an impact on the sample mass.
{"title":"Impact of additive manufacturing on reaction to fire","authors":"T. Nazé, F. Poutch, F. Bonnet, M. Jimenez, S. Bourbigot","doi":"10.1177/07349041231158990","DOIUrl":"https://doi.org/10.1177/07349041231158990","url":null,"abstract":"Additive manufacturing, including fused deposition modelling, is a growing technology opening up wide perspectives in material sciences. However, the ability to produce suitable fire-retarded materials via this process has never been studied extensively. This work focuses on understanding the relation between reaction to fire and numerous additive manufacturing parameters. The goal was to determine the impact of those parameters on standard fire tests such as flame propagation test (UL94V) and cone calorimetry. The results were compared with material samples formulated via usual processes. On one hand, flame propagation results are impacted by many additive manufacturing parameters, such as the design of the part and the material flow. On the other hand, cone calorimeter results are only influenced by parameters having an impact on the sample mass.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49648713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-10DOI: 10.1177/07349041231153145
Wohan Cui, Ankit Sharma, Ya-Ting T. Liao
Flame spread over discrete solid fuels has been of key research interest in the past few decades. Most studies considered an array of discrete fuels separated by air gaps or heat-insulating inert materials. The effects of heat loss due to the discrete configuration are not well understood. The present study aims to bridge this knowledge gap. A series of experiments are performed using a vertical array of thin discrete fuels separated by heat-absorbing inert materials of different thicknesses. For comparisons, experiments are also performed using discrete fuels separated by air gaps and using continuous fuel. The flame base spread rate is found to be generally higher in discrete fuel than in continuous fuel configurations, due to a reduced fuel load per unit length. It is also found that the air and inert gaps have opposite effects on the solid burning rates. The air gaps break the no-slip boundary, allowing the laterally entrained buoyancy flow (normal to the sample surface) to push the flame closer to the samples. This leads to an enhanced heat flux on the sample surface and an increased solid burning rate. On the other hand, the inert materials retain the flow boundary profile and act as a heat sink during flame spread, thereby reducing the solid burning rate. As the inert thickness increases, flame spread rate and solid burning rate decrease. Based on these observations, an existing model for flame spread rate is updated by incorporating the heat-absorbing effects of the gaps. The correlation is validated using the experimental data.
{"title":"Upward flame spread over discrete thin solids separated by heat-absorbing inert materials","authors":"Wohan Cui, Ankit Sharma, Ya-Ting T. Liao","doi":"10.1177/07349041231153145","DOIUrl":"https://doi.org/10.1177/07349041231153145","url":null,"abstract":"Flame spread over discrete solid fuels has been of key research interest in the past few decades. Most studies considered an array of discrete fuels separated by air gaps or heat-insulating inert materials. The effects of heat loss due to the discrete configuration are not well understood. The present study aims to bridge this knowledge gap. A series of experiments are performed using a vertical array of thin discrete fuels separated by heat-absorbing inert materials of different thicknesses. For comparisons, experiments are also performed using discrete fuels separated by air gaps and using continuous fuel. The flame base spread rate is found to be generally higher in discrete fuel than in continuous fuel configurations, due to a reduced fuel load per unit length. It is also found that the air and inert gaps have opposite effects on the solid burning rates. The air gaps break the no-slip boundary, allowing the laterally entrained buoyancy flow (normal to the sample surface) to push the flame closer to the samples. This leads to an enhanced heat flux on the sample surface and an increased solid burning rate. On the other hand, the inert materials retain the flow boundary profile and act as a heat sink during flame spread, thereby reducing the solid burning rate. As the inert thickness increases, flame spread rate and solid burning rate decrease. Based on these observations, an existing model for flame spread rate is updated by incorporating the heat-absorbing effects of the gaps. The correlation is validated using the experimental data.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45692412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-01DOI: 10.1177/07349041231153040
M. Taylor, H. Francis, J. Fielding
Previous studies indicated that the elderly are vulnerable to fire injury. In this article, the nature of such vulnerability in terms of fire injury risk factors including age band, gender, occupancy level, deprivation, mobility, alcohol consumption and attempting to fight the fire is examined in a UK Fire and Rescue Service between April 2011 and April 2022. Fire injury risk was more common the greater the age of the elderly individual, more likely for males up to 74, but more likely for females above that age, possibly due to the greater proportion of females to males above age 74 in the area and time period studied. Elderly fire injuries mainly occurred in single occupancy housing and in more deprived areas. Cooking-related fire injuries accounted for 60.2% of elderly fire injuries, followed by smoking-related fire injuries (14.3%) and heating-related fire injuries (7.2%). Fire fatalities were not included in the analysis.
{"title":"Old age and fire injury","authors":"M. Taylor, H. Francis, J. Fielding","doi":"10.1177/07349041231153040","DOIUrl":"https://doi.org/10.1177/07349041231153040","url":null,"abstract":"Previous studies indicated that the elderly are vulnerable to fire injury. In this article, the nature of such vulnerability in terms of fire injury risk factors including age band, gender, occupancy level, deprivation, mobility, alcohol consumption and attempting to fight the fire is examined in a UK Fire and Rescue Service between April 2011 and April 2022. Fire injury risk was more common the greater the age of the elderly individual, more likely for males up to 74, but more likely for females above that age, possibly due to the greater proportion of females to males above age 74 in the area and time period studied. Elderly fire injuries mainly occurred in single occupancy housing and in more deprived areas. Cooking-related fire injuries accounted for 60.2% of elderly fire injuries, followed by smoking-related fire injuries (14.3%) and heating-related fire injuries (7.2%). Fire fatalities were not included in the analysis.","PeriodicalId":15772,"journal":{"name":"Journal of Fire Sciences","volume":null,"pages":null},"PeriodicalIF":1.9,"publicationDate":"2023-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42090403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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