Fires Burning Research Articles

Experimental and numerical investigation into burning rate and fire plume characteristic of pool fire with plate obstacle

Pool fire is a common type of fire accident in the petrochemical industry, which often causes significant casualties and property damage. In most real fire scenarios involving the interaction between pool fire and obstacles, the surrounding obstacles would impact the development of the pool fire significantly, altering the results of fire risk assessment. To address these knowledge gaps, a comprehensive experimental and numerical analysis was conducted to explore the pool fire behavior with plate obstacle. The results show that as the obstacle height decreases or diameter increases gradually, the average burning rate increases obviously. The temperature and flow fields were obtained through numerical simulation, and indentified as three distinct patterns. It was found that the vortices formed near the obstacles facilitate the mixing of air and fuel vapor, thereby changing the fire plume behavior. In addition, the classical model for the plume centerline temperature was modified for pool fire with plate obstacle. This work enhances understanding of pool fire behavior with plate obstacles, which directly contribute to mitigating fire damage and improving energy application safety.

The Interacting Influence of Fire and Tree Characteristics on Douglas-Fir Beetle Host-Tree Selection Five Years Post-Fire

Fire injury stresses Douglas-fir trees (Pseudotsuga menziesii) that survive a wildfire event, allowing subsequent Douglas-fir beetle (Dendroctonus pseudotsugae) infection to kill trees that may have otherwise survived. This study aimed to determine how fire injury, stand, and tree characteristics drive Douglas-fir beetle host tree selection five years post-fire. We paired 28 adjacent beetle-infected and uninfected stands (infected N = 14) and 140 Douglas-fir trees (infected N = 70) within the 416 Fire burn area in Southwest Colorado. We found no statistically significant differences between infected and uninfected stand characteristics. Individual tree height, DBH, and bark char severity index were significantly higher in infected versus uninfected trees. We created a regression decision tree model to determine the influence of fire injury and tree characteristics on the probability of infection. Trees with a height ≥ 27 m, bark char height < 2.3 m, and DBH < 80 cm had the greatest probability of attack (100%). Trees with a height < 27 m, bark char severity index < 5.5, and DBH < 49 cm had the lowest probability of attack (3.7%). Understanding the influence of fire on Douglas-fir beetle host selection allows land managers to model potential epidemic outbreaks and guide proactive management actions that may reduce beetle outbreak severity or preserve high-value trees not killed by fire.

Burns in epileptic patients: Pattern and outcome.

Objective: To determine the pattern and outcome of burns in epileptic patients. Study Design: Retrospective study. Setting: Plastic and Burn Unit, Lady Reading Hospital, Peshawar. Period: January 2021 to Decmber 2022. Material & Methods: The research was conducted at the Plastic surgery and burn unit of Lady Reading Hospital Peshawar. Digital records of 35 epileptic patients admitted in the last five years were extracted. The demographics, burn pattern, total body surface area, level of burn, surgical outcome, complications, and length of hospital stay of epileptic patients were extracted from the electronic record. IBM-SPSS version 20 was used to analyze the data. Results: Over the last five years, 35 epileptic patients have been admitted to our unit. Males made up 28.6% of our patients, while females were 71.4%. The patient's average age was 24.14 years ±16. 28 SD. The most common pattern in our patients was fire burn (62.9%), followed by scald (25.7%), and the least common pattern was 11.4%. 10 to 20% of body surface area burns were seen in 51.4% of patients, less than 10% in 20% of patients, and >20% burns in 28.6% of patients. The majority of the patients (37.1%) had a full-thickness burn, followed by mixed burns (31.4%), deep partial-thickness burns (20%), and superficial partial-thickness burns (11.4%). Twenty-eight patients stayed in the hospital for 1 to 14 days, 04 patients for 15 to 30 days, and 03 patients for 31 to 45 days. Conclusion: Epilepsy-related burns are a serious public health concern in developing nations, putting a significant burden on burn units due to the severity of the burns and the duration of hospital admissions.

A REVIEW ON CONSUMER INCLINATION TOWARDS IMITATION JEWELLERY

This study is undertaken analyse the inclination of imitation jewellery and their satisfaction level towards price, variety, quality and convenience therefore keeping now in mind, some objective were framed and also the study was carried, supported the objectives. The data is collected through questionnaire, as it is the most accessible way for the experimenter as well as the replier. The collected date was analysis by using chance system chance was calculated by taking the number of replier for a particular parameter against the total number of repliers. The Chi-square test is used in this study to find out whether there is any significant association between the particular factors and source of mindfulness and family income per month and quantum spent on imitation jewellery per time. The average ranking analysis is used to analyses the opinion given by the repliers for important factors, the weights has been given to each factors and total scoring are calculated, The average score analysis deals with consumer position of satisfaction towards price, variety, quality and vacuity of imitation jewellery. Hence the manufacturer has to introduce imitation jewellery to satisfy the need of consumers at all level of income. The manufacturers should keep an eye on quality and see that delivery schedules are kept. The beautiful designs and the equally beautiful materials with which they are made and most importantly the economical cost make imitation jewellery the most wanted item on anybody shopping list. All this keeps the fires burning in the imitation jewellery industry and helps in bringing out new and improved beautiful works of art in imitation jewellery. KEY WORDS: Imitation jewellery, trends, inclination, variety, design, price and availability

Simulated Future Shifts in Wildfire Regimes in Moist Forests of Pacific Northwest, USA

AbstractFire is an integral natural disturbance in the moist temperate forests of the Pacific Northwest of the United States, but future changes remain uncertain. Fire regimes in this climatically and biophysically diverse region are complex, but typically climate limited. One challenge for interpreting potential changes is conveying projection uncertainty. Using projections of Energy Release Component (ERC) derived from 12 global climate models (GCM) that vary in performance relative to the region's contemporary climate, we simulated thousands of plausible fire seasons with the stochastic spatial fire spread model FSim for mid‐21st century (2035–2064) under RCP8.5 emissions scenario for five northwestern pyromes. The magnitude of projected changes to burn probability, fire size, and number of fires varied among pyromes and GCMs. We projected the largest increases in burn probability and fire size in the cooler and wetter northern parts of the region (North Cascades, Olympics & Puget Lowlands) and Oregon West Cascades, with more moderate changes projected for the Washington West Cascades and Oregon Coast Range. We provide new insights into changing fire regimes characterized by the possibility of shifts toward more frequent and large fires (especially >40,000 ha), as well as shifts in seasonality, including more fires burning at the beginning of fall when extreme synoptic weather events have the potential to increase fire spread. Our work highlights the potential geographic variability in climate change effects in some of the most productive moist temperate forests of the world and points to a rapid acceleration of fire in the coming decades.

Global seasonal prediction of fire danger

The European Centre for Medium range weather forecast (ECMWF) on behalf of the Copernicus Emergency Management Service (CEMS) has recently widened the fire danger data offering in the Climate Data Store (CDS) to include a set of fire danger forecasts with lead times up to 7 months. The dataset incorporates fire danger indices for three different models developed in Canada, United States and Australia. The indices are calculated using ECMWF Seasonal Forecasting System 5 (SEAS5) and verified against the relevant reanalysis of fire danger based on the ECMWF Re-Analysis (ERA5). The data set is made openly available for the period 1981 to 2023 and will be updated regularly providing a resource to assess the predictability of fire weather at the seasonal time scale. The data set complements the availability of seasonal forecast provided by the Copernicus Emergency Management Service in real time.A preliminary analysis shows that globally anomalous conditions for fire weather can be predicted with confidence 1 month ahead. In some regions the prediction can extend to 2 months ahead. In most situations beyond this horizon, forecasts do not show more skill than climatology. However an extended predictability window, up to 6-7 months ahead is possible when anomalous fire weather is the results of large scale phenomena such as the El Niño Southern Oscillation and the Indian Ocean Dipole, often conducive of extensive fire burning in regions such as Indonesia and Australia.

Modern pollen dispersal in relation to present vegetation distribution and land use in the Baspa valley, Kinnaur, western Himalayas.

Interpretation of a fossil pollen data for the vegetation and climate reconstruction of any region needs a modern pollen-vegetation analogue for its calibration. We analyzed the surface sediments and moss polsters for the pollen and microcharcoal records to understand the modern pollen-vegetation relationship and human activities in the Baspa Valley, Kinnaur, Himachal Pradesh. Presently, valley is occupied by the arboreal and non-arboreal vegetation of temperate to subalpine habitats and land use activities. The recovered pollen assemblages showed variability in the dispersal behavior of pollen of taxa growing along the valley transect and also captured the signals of human activities over land use. The overall dominance of arboreal pollen in the recovered pollen assemblage corresponds with the dominant growth of conifers and broadleaf tree taxa and represents the valley vegetation at a regional scale. However, the profuse pollen production of a few arboreal taxa and long distance pollen transport from one vegetation zone to other by the strong upthermic valley winds could bias the pollen representation of in-situ vegetation. The high pollen frequency of non-arboreal taxa in the open meadows represents the near vicinity to their plant source. Human activities like fire burning and cultivation by the local population are evident by the recovery of microcharcoal particles and pollen of plants belonging to Cerealia Poaceae, Asteraceae, Amaranthaceae, Polygonaceae, Rosaceae, Juglandaceae, etc. The dataset taken as modern pollen-vegetation analogue is useful to assess past changes in the vegetation and land cover in relation to climate and human factors for future sustenance.

Bacterial Emission Factors: A Foundation for the Terrestrial-Atmospheric Modeling of Bacteria Aerosolized by Wildland Fires.

Wildland fire is a major global driver in the exchange of aerosols between terrestrial environments and the atmosphere. This exchange is commonly quantified using emission factors or the mass of a pollutant emitted per mass of fuel burned. However, emission factors for microbes aerosolized by fire have yet to be determined. Using bacterial cell concentrations collected on unmanned aircraft systems over forest fires in Utah, USA, we determine bacterial emission factors (BEFs) for the first time. We estimate that 1.39 × 1010 and 7.68 × 1011 microbes are emitted for each Mg of biomass consumed in fires burning thinning residues and intact forests, respectively. These emissions exceed estimates of background bacterial emissions in other studies by 3-4 orders of magnitude. For the ∼2631 ha of similar forests in the Fishlake National Forest that burn each year on average, an estimated 1.35 × 1017 cells or 8.1 kg of bacterial biomass were emitted. BEFs were then used to parametrize a computationally scalable particle transport model that predicted over 99% of the emitted cells were transported beyond the 17.25 x 17.25 km model domain. BEFs can be used to expand understanding of global wildfire microbial emissions and their potential consequences to ecosystems, the atmosphere, and humans.

Are fire intensity and burn severity associated? Advancing our understanding of FRP and NBR metrics from Himawari-8/9 and Sentinel-2

Burn severity has been widely studied. Typical approaches use spectral differencing indices from remotely sensed data to extrapolate in-situ severity assessments. Next generation geostationary data offer near-continuous fire behaviour information, which has been used for fire detection and monitoring but remains underutilized for fire impact estimation. Here, we explore the association between remotely sensed fire intensity metrics and spectral differencing severity indices to understand whether and where they describe similar wildfire effects. The commonly used Differenced Normalised Burn Ratio (dNBR) severity index was calculated for Advanced Himawari Imager (AHI − 2 km) and Sentinel-2 (20 m) data and compared to different Fire Radiative Power (FRP) metrics derived from fire hotspot detections from AHI data across Australia. The comparison was implemented through different stratifications based on biogeographical region, land cover, fire type, and percentage of AHI pixel burned (fire fractional cover). The results indicate that FRP and dNBR metrics do not correlate in most scenarios, noting correlations being marginally stronger for hotter fires. However, correlations become significantly stronger when data are grouped using fire type information and fire fractional cover, with correlations peaking (R = 0.75) for large fires that burned 41–60 % of an AHI pixel. In conclusion, remotely sensed fire intensity and severity proxies capture different aspects of wildfire impact, that only correlate with each other after using auxiliary data. Spectral differencing severity metrics have been used extensively during the past decades, however high-frequency fire intensity estimations have the potential to augment the existing information and reveal new ways of characterizing wildfire impact over large areas.

Pembuatan Tungku Pembakaran Logam

Current technological advances have produced many products that aim to make human work easier. One of them is an iron burning tool that uses a blower as a tool used to increase or enlarge the air or gas pressure that will flow into the combustion container (furnace). The blower used is a 2 inch snail blower as a tool to increase the air pressure so that the air that is supplied can enlarge the burning flame. The furnace used is a drum coated with heat-resistant cement which can withstand the heat of the combustion fire so that the furnace does not melt. The frame materials used are hollow iron measuring 40 x 40 and angle iron measuring 40x40. For combustion, it uses coal as the main fuel and the blower itself as an air distributor so that it can produce the desired fire. Based on the test results in a metal burning furnace, a temperature of 340°C can be obtained as planned so that by heating the metal, various types of equipment can be formed as desired

Prescribed burning mitigates the severity of subsequent wildfires in Mediterranean shrublands

BackgroundPrescribed burning (PB) is becoming relevant in fuel reduction and thus fire hazard abatement in fire-prone ecosystems of southern Europe. Yet, empirical evidence on the effectiveness of this practice to mitigate wildfire severity in Mediterranean shrublands is non-existent, despite being the focus of PB efforts in this region. Here, we intended to quantify the protective effect of PB treatment units (2005–2021) to subsequent wildfire severity in shrublands across mainland Portugal, as well as the relative contribution and complex interactions between drivers of wildfire severity in PB-treated areas and untreated neighboring counterparts through Random Forest regression. We leveraged cloud-computing remote sensing data processing in Google Earth Engine to estimate fire severity (PB and wildfire) as the Relativized Burn Ratio (RBR) using Landsat data catalog.ResultsPB treatment was particularly effective at mitigating wildfire severity at the first PB-wildfire encounter in shrublands, with a mean reduction of around 24% in RBR units. Fuel age (i.e., time since prescribed burning) in PB-wildfire intersection areas overwhelmed to a large extent the effect of fire weather, burning probability, and PB severity. The mitigating effect of PB on wildfire severity persisted for a fuel age of around 5 years. However, this effect decreased with increasingly adverse fire weather conditions, such that variation in wildfire severity was somewhat insensitive to fuel age under extreme fire weather. Similarly, the lowest wildfire severity experienced in sites with high burning probability, along with the interaction effect observed between burning probability and fuel age, suggest that repeated PB treatments may be useful in controlling fuel accumulation and mitigating wildfire severity. The relative contribution of fire weather in explaining wildfire severity was exceedingly high in untreated areas, doubling that of the other variables in the model in the absence of PB treatment variables.ConclusionsOur results suggest that the implementation of PB treatments at intervals of less than 5 years is of paramount importance to control fuel build-up and fire hazard under extreme fire weather in productive Mediterranean shrublands. Further research on this topic is warranted in other shrublands worldwide, namely in Mediterranean-type climate regions.

Case Report and Review of the Literature: Human Amniotic Membrane in the Management of Burn Wounds

High-voltage electrical burns often have a deeper extent and cause more damage to surrounding soft tissue than injuries caused by fire burns or scalds. For the treatment of burn injuries there are dressings, dermal analogues, temporary skin substitutes; which favor the re-epithelialization of the wound bed, accelerating the healing process and some of them having specific properties. We present a case of a 41-year-old man who suffered high-voltage electrical burns on the face, neck, thorax, abdomen, upper limbs, and lower limbs. He underwent surgical cleaning at the day of his hospital admission, 7 days later a second surgical cleaning was performed with placement of human amniotic membrane in thoracic and abdominal burns. 10 months after the burn, the patient presents complete recovery of his burn injuries, hyperchromic scars with no evidence of pathological healing. As neurological sequelae, he presented polyneuropathy secondary to electrocution. We conclude that the amniotic membrane is an excellent substitute for temporary skin, useful for promoting the epithelialization of bloody areas from burns and reducing the local inflammatory response. Conclusion: The comparison between robotic-assisted liver surgery and laparoscopic surgery shows that the average medical cost was higher in robotic surgery when compared to laparoscopic liver cancer.

Burning and plume flow behaviors of annular pool fires: with and without air entrainment through the pool center.

Annular pool fires, frequently happened in chemical industries, have a significant influence on environmental pollution. Air pollution, greenhouse gas emissions, water pollution, and soil contamination are general ways of environmental hazards caused by the annular pool fires. This study built upon our previous study (Environ. Sci. Pollut. Res., 2023, 30(21): 59781-59792.), and extended to investigate the combustion and fire plume flow behaviors of annular pool fires, both with and without air entrainment through the hollow center of the annular pool. Results show that when there is no air entrainment through the hollow center, the low combustion intensity area at the plume's central axis gradually extends while the high combustion intensity area concentrates at higher places and the flame height increased by nearly 40% from a solid pool (Din/Dout = 0) to the annular pool (Din/Dout = 0.80). Additionally, the area with high combustion intensity is more concentrated at a higher position. The combustion of annular pool fires was found to be dominated by non-premixed diffusion combustion. The center of the annular pool fires is dominated by air prior to flame merging and by fuel vapor after the merging occurs. For annular pool fires with air entrainment through the center of the pool, the combustion intensity increases as Din/Dout at the plume base increases. And, the flame height decreased by nearly 25% as Din/Dout increases. Flame burning occurs both on the outside and inside of the plume, exhibiting a "double layer" combustion characteristic. It reveals that the combustion of the fire plume transitions to premixed diffusion combustion. The center of the annular pool fire is predominantly composed of air. Understanding and controlling annular pool fires can lead to new methods for remediating fuel spills, reducing pollution from combustion, and advancing research in fluid mechanics.

Effect of Semi-Transverse Ventilation Velocity on Combustion Characteristics of Pool Fire Sources in a Scaled Tunnel

Compared to longitudinal ventilation, there are few studies on fire source development under semi-transverse ventilation. This work studied the influence of semi-transverse ventilation on the combustion characteristics of fire sources in a scaled tunnel. The burning rate and heat transfer feedback during pool fire combustion were revealed under different longitudinal and transverse ventilation velocities. The results showed that transverse ventilation had little influence on combustion characteristics, and the burning rate was more obviously affected by longitudinal ventilation. The heat convection feedback increased monotonically with the increase of the longitudinal ventilation, which led to the increase of the total heat feedback on the fuel. The heat radiation feedback changed little, and the heat conduction feedback decreased monotonically with the increase of the longitudinal ventilation velocity. By aid of a Fire Dynamics Simulator, it was found that the flame tilted downstream and was in the flow line of the lower cold air flow coming from upstream and the upper hot smoke flow outgoing in the downstream direction. The transverse ventilation of 2 m/s or lower hardly affected the combustion field of the fire source. Therefore, semi-transverse ventilation is preferable to longitudinal ventilation from the point of view of limiting fire expansion.

Climate Change, Landscape Fires, and Human Health: A Global Perspective.

Landscape fires are an integral component of the Earth system and a feature of prehistoric, subsistence, and industrial economies. Specific spatiotemporal patterns of landscape fire occur in different locations around the world, shaped by the interactions between environmental and human drivers of fire activity. Seven distinct types of landscape fire emerge from these interactions: remote area fires, wildfire disasters, savanna fires, Indigenous burning, prescribed burning, agricultural burning, and deforestation fires. All can have substantial impacts on human health and well-being directly and indirectly through (a) exposure to heat flux (e.g., injuries and destructive impacts), (b) emissions (e.g., smoke-related health impacts), and (c) altered ecosystem functioning (e.g., biodiversity, amenity, water quality, and climate impacts). Minimizing the adverse effects of landscape fires on population health requires understanding how human and environmental influences on fire impacts can be modified through interventions targeted at individual, community, and regional levels.

Experimental analysis on comprehensive combustion performances of vehicle-level thermal runaway

As the growing population of electric vehicles, the increasing fire accidents have drawn much attention both for researcher and society. Unfortunately, the real-conditional thermal runaway is hard to recurrent according to diverse inducements. The comprehensive combustion behaviors for vehicle-level fire accident are still confusing and should be further investigated, and the results will provide guidance on further improvement of vehicle safety or further applicational situation. In this article, a vehicle-level thermal runaway experiment is carried out with a commercial SUV, and multi-information is collected to determine the combustion behavior and fire spreading path including temperature, voltage and gases. The artificial arson is selected as the inducement for simulating the real-conditional accident, and 4 periods on fire burning are divided according to combustion behaviors. An interval of 12 mins before the battery thermal runaway can be observed and provide probability for roadside assistance. Moreover, the safe distance of possible harmful hazards is less than 10 m, and should be warning when designing underground parking. Then, Limited voltage decrease of 10 mV is recognized as early-warning information before battery thermal runaway, and the large voltage jump or characteristic temperature help for diagnostic of thermal runaway. Finally, the established experimental workbench delivers the potential solution for vehicle-level thermal runaway analysis, and can be promoted to other experiments under various inducements. The article highlights the whole process of fire spreading of electric vehicle and help to improve the safety of vehicles according to the results.

Keep the Home Fires Burning: Citizenship, Affect and Acting Muslim in Kamila Shamsie’s Home Fire (2017)

Keep the Home Fires Burning: Citizenship, Affect and Acting Muslim in Kamila Shamsie’s Home Fire (2017)

Investigating the evolution of pore space and magnetization rate of rocks under the effect of coal fire burning

Investigating the evolution of pore space and magnetization rate of rocks under the effect of coal fire burning

OBE视域下基于BOPPPS模式的线上线下混合式教学探索与实践——以“消防燃烧学”为例

OBE视域下基于BOPPPS模式的线上线下混合式教学探索与实践——以“消防燃烧学”为例

РАЗРАБОТКА ДЫМОГЕНЕРИРУЮЩЕГО УСТРОЙСТВА, ИМИТИРУЮЩЕГО ТЕСТОВЫЕ ОЧАГИ ПОЖАРА ПРИ ПРОВЕДЕНИИ КОМПЛЕКСНЫХ ИСПЫТАНИЙ СИСТЕМ ПОЖАРНОЙ СИГНАЛИЗАЦИИ

The work analyzes scientific and technical literature and open commercial information on methods and instruments for assessing the performance of smoke fire detectors. 
 It has been revealed that the use of special aerosol smoke simulators for the purpose of comprehensive testing of smoke fire detectors is associated with the danger of exceeding the optical density of smoke, which significantly complicates evacuation. As a new solution, the use of portable smoke generators «Kiparis» (St and 0,6St) is proposed, capable of generating a flow 
 of smoke, the optical properties of which are similar to the smoke from the combustion of test fires TP-1, TP-2, TP-3 and TP-4. Mathematical modeling of the combustion of a test fire TP-1 (open burning of wood) in accordance with GOST 34698–2020 «Fire detectors. General technical requirements. Test methods» has been conducted. During the model experiment, it was shown that the portable smoke generator «Kiparis» is capable of generating smoke with an optical density comparable to that of smoke from the combustion of test fires, which is a practical justification for using the smoke generator «Kiparis» instead of test fires.