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Dissertations / Theses on the topic 'Heat flux. Heat Flame spread'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Beaulieu, Patricia. "Flammability characteristics at heat fluxes up to 200 kW/m2 and the effect of oxygen on flame heat flux." Link to electronic dissertation, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-121905-082146/.

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Dissertation (Ph.D.) -- Worcester Polytechnic Institute.<br>Keywords: ignition; fire; flammability; burning; scalability; heat flux oxygen; mass loss rate. Includes bibliographical references (p.44-49).

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Beaulieu, Patricia. "Flammability Characteristics at Heat Fluxes up to 200 kW/m2 and The Effect of Oxygen on Flame Heat Flux." Digital WPI, 2005. https://digitalcommons.wpi.edu/etd-dissertations/427.

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"This dissertation documents two interrelated studies that were conducted to more fundamentally understand the scalability of flame heat flux. The first study used an applied heat flux in the bench scale horizontal orientation which simulates a large scale flame heat flux. The second study used enhanced ambient oxygen to actually increase the bench scale flame heat flux itself. Understanding the scalability of flame heat flux more fully will allow better ignition and combustion models to be developed as well as improved test methods. The key aspect of the first study was the use of real scale

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3

Fleury, Rob. "Evaluation of Thermal Radiation Models for Fire Spread Between Objects." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2010. http://hdl.handle.net/10092/4959.

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Fire spread between objects within a compartment is primarily due to the impingement of thermal radiation from the fire source. In order to estimate if or when a remote object from the fire will ignite, one must be able to quantify the radiative heat flux being received by the target. There are a variety of methods presented in the literature that attempt to calculate the thermal radiation to a target; each one based on assumptions about the fire. The performance of six of these methods, of varying complexity, is investigated in this research. This includes the common point source model,

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4

Wong, William Chiu-Kit. "CFD Flame Spread Model Validation: Multi-Component Data Set Framework." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/918.

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"Review of the literature shows that the reported correlation between predictions and experimental data of flame spread vary greatly. The discrepancies displayed by the models are generally attributed to inaccurate input parameters, user effects, and inadequacy of the model. In most experiments, the metric to which the model is deemed accurate is based on the prediction of the heat release rate, but flame spread is a highly complex phenomenon that should not be simplified as such. Moreover, fire growth models are usually made up of distinctive groups of calculation on separate physical phen

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5

Wright, Mark T. "Flame spread on composite materials for use in high speed craft." Link to electronic version, 1999. http://www.wpi.edu/Pubs/ETD/Available/etd-110599-160802/.

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6

Peraza, Ávila Jesús Enrique. "Experimental study of the diesel spray behavior during the jet-wall interaction at high pressure and high temperature conditions." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/149389.

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[EN] The potential of diesel engines in terms of robustness, efficiency and energy density has made them widely used as power generators and propulsion systems. Specifically, fuel atomization, vaporization and air-fuel mixing, have a fundamental effect on the combustion process, and consequently, a direct impact on pollutant formation, fuel consumption and noise emission. Since the combustion chamber has a limited space respect to the spray penetration, wall impingement is considered to be a common event in direct injection diesel engines, having a relevant influence in the spray evolution and

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7

Adam, Brittany A. "INCORPORATING DYNAMIC FLAME BEHAVIOR INTO THE SCALING LAWS OF WILDLAND FIRE SPREAD." UKnowledge, 2015. http://uknowledge.uky.edu/me_etds/54.

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A challenge for fire researchers is obtaining data from those fires that are most dangerous and costly. While it is feasible to instrument test beds, test plots, and small prescribed burns for research, it is uncommon to successfully instrument an active wildland fire. With a focus on very specific facets of wildland fire, researchers have created many unique models utilizing matchsticks, cardboard, liquid fuel, excelsior, plywood, live fuels, dead fuels, and wood cribs of different packing densities. Such scale models, however, only serve as valid substitutes for the full-scale system when al

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8

Musluoglu, Eren. "A Theoretical Analysis Of Fire Development And Flame Spread In Underground Trains." Phd thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610860/index.pdf.

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The fire development and flame spread in the railway carriages are investigated by performing a set of simulations using a widely accepted simulation software called &amp<br>#8216<br>Fire Dynamics Simulator&amp<br>#8217<br>. Two different rolling stock models<br>representing a train made up of physically separated carriages, and a 4-car train with open wide gangways<br>have been built to examine the effects of train geometry on fire development and smoke spread within the trains. The simulations incorporate two different ignition sources<br>a small size arson fire, and a severe baggage fire i

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9

山本, 和弘, Kazuhiro YAMAMOTO, 幸一森, Koichi MORI, 義昭小沼 та Yoshiaki ONUMA. "可燃性固体の燃え拡がりに及ぼす周囲雰囲気の影響 (第2報, 希釈の影響と気相の温度測定)". 日本機械学会, 2003. http://hdl.handle.net/2237/9358.

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山本, 和弘, та Kazuhiro YAMAMOTO. "可燃性固体の燃え拡がりに対するモデルの検討". 日本機械学会, 2003. http://hdl.handle.net/2237/9361.

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11

山本, 和弘, Kazuhiro YAMAMOTO, 哲. 瀬尾 та ін. "燃料を添加した部分予混合雰囲気中の可燃性固体の燃え拡がり". 日本機械学会, 2003. http://hdl.handle.net/2237/9001.

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12

山本, 和弘, Kazuhiro YAMAMOTO, 幸一森, Koichi MORI, 義昭小沼 та Yoshiaki ONUMA. "可燃性固体の燃え拡がりに及ぼす周囲雰囲気の影響 (周囲温度の影響と鉛直下方燃え拡がり限界酸素濃度)". 日本機械学会, 2002. http://hdl.handle.net/2237/9356.

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13

ONUMA, Yoshiaki, 義昭小沼, 哲. 瀬尾, 和弘山本, Satoshi SEO та Kazuhiro YAMAMOTO. "部分予混合雰囲気中における可燃性固体の燃え拡がり". 日本燃焼学会, 2003. http://hdl.handle.net/2237/19785.

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ONUMA, Yoshiaki, Hiroyuki TOJYO, Kazuhiro YAMAMOTO, 義昭小沼, 博之東城 та 和弘山本. "部分予混合雰囲気中に形成された火炎の燃え拡がりの実験と解析". 日本燃焼学会, 2005. http://hdl.handle.net/2237/19786.

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15

Tseng, Ya-Ting. "Three-Dimensional Model of Solid Ignition and Ignition Limit by a Non-Uniformly Distributed Radiant Heat Source." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1307551796.

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16

Coelho, Fernando José Vinhas Sousa. "Medição da velocidade de chama plana laminar de misturas metano/ar e gás natural/ar utilizando o método de fluxo de calor." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/103804.

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A velocidade de queima laminar adiabática de reações de combustão é um parâmetro chave, relacionado à cinética química do combustível, a qual define características importantes como a forma e a faixa de estabilidade de uma chama. Nos últimos anos, um grande esforço vem sendo direcionado para a determinação precisa desse parâmetro para diferentes combustíveis, porém a grande diversidade de técnicas e metodologias de medição existente acarreta em uma grande dispersão entre os resultados encontrados na literatura. Dentre as várias técnicas disponíveis, o método do fluxo de calor destaca-se por fo

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17

Alston, Jarrod John. "Room/Corner Fire Calibration Data: Marine Composite Screening Specimens." Link to electronic thesis, 2004. http://www.wpi.edu/Pubs/ETD/Available/etd-0527104-180727/.

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18

Lucianelli, Dario. "Numerical and experimental analysys of the laminar burning velocity of hydrocarbons mixtures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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This thesis work has the aim to investigate on burning velocities of premixed laminar flames. Laminar burning velocity is a fundamental parameter describing how a flat flame propagates into quiescent unburned mixtures ahead of the flame at a specific pressure and temperature. Various gaseous hydrocarbon mixtures have been examined: methane (with amounts of ethylene, propylene and hydrogen), ethylene, propylene and propane (with amounts of hydrogen). In all the cases atmospheric air has been considered as oxidizing agent. All the premixed flames are at the temperature of 298 K and atmospheric

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19

Endo, Makoto. "Numerical modeling of flame spread over spherical solid fuel under low speed flow in microgravity:Model development and comparison to space flight experiments." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1461022358.

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20

Ranganathan, Sreenivasan. "Influence of Dusts on Premixed Methane-Air Flames." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/86.

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Influence of dust particles on the characteristics of premixed methane-air flames has been studied in this dissertation. Experiments are performed in a Bunsen burner type experimental set-up called Hybrid Flame Analyzer (HFA), which can be used to measure the burning velocity of gas, dust, and hybrid (gas and dust) premixed flames at constant pressure operating conditions. In the current study, analysis of particle-gas-air system of different types of dust particles (at particle size, dp = 75-90 Âµm) in premixed methane-air (ϕg = 0.8, 1.0 and 1.2) flames. Coal, sand, and sodium bicarbonate par

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21

Jaworská, Petra. "Vliv paliva hořáku na přenos tepla v procesních pecích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400846.

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This diploma thesis is about an influence of technical gases CO2 and N2, that are present in a fuel, over overall combustion process and a flue gas emissions. The first part of this thesis discussed issues like heat transfer, basic process combustion utilities, used technical gases in experimental part and finally description of observed pollutants. Second part of thesis describes the experiments themselves. Experiments were trying to find how selected parameters were influenced by adding 40 mN3/h or 80 mN3/h of inert gases to a flow of natural gas. Observed parameters were namely emission vol

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22

Macenauerová, Tereza. "Vliv vnitřní recirkulace spalin na charakteristické parametry spalování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232140.

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This thesis deals with the evaluation of emissions of NOx and CO formed during the combustion process when the burner utilizing fuel staging and internal flue gas recirculation is used. In the theoretical part the NOx formation mechanisms and methods used to suppress their formation are described. This is followed with the currently valid legislation in the Czech Republic in terms of the emission limits for NOx and CO in stationary sources. In the work, combustion tests were performed at the burners testing facility at UPEI BUT. The tests revealed that the most important parameters, which infl

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23

Weber, Fabian. "Optical Analysis of the Hydrogen Cooling Film in High Pressure Combustion Chambers." Thesis, Luleå tekniska universitet, Rymdteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-76872.

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For performance optimisation of modern liquid cryogenic bipropellant rocket combustion chambers, one component which plays an important role in reducing the wall side heat flux, is the behaviour of the cooling film. At the Institute of Space Propulsion of the German Aerospace Center (DLR) in Lampoldshausen, hot test runs have been performed using the experimental combustion chamber BKM, to investigate the wall side heat flux which is -- among other factors -- dependent on cooling film properties. To gain more insight into the film behaviour under real rocket-like conditions, optical diagnostic

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24

Parkes, Anthony Richard. "The impact of size and location of pool fires on compartment fire behaviour." Thesis, University of Canterbury. Civil and Natural Resources Engineering, 2009. http://hdl.handle.net/10092/3444.

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An understanding of compartment fire behaviour is important for fire protection engineers. For design purposes, whether to use a prescriptive code or performance based design, life safety and property protection issues are required to be assessed. The use of design fires in computer modelling is the general method to determine fire safety. However these computer models are generally limited to the input of one design fire, with consideration of the complex interaction between fuel packages and the compartment environment being simplified. Of particular interest is the Heat Release Rate, HRR, a

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25

Comitis, Spiros Costas. "An experimental and modelling study of fires in ventilated passages." Thesis, 1994. http://hdl.handle.net/10539/22932.

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A thesis submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfillment of the requirements for the degree of Doctor of Philosophy.<br>A theoretical and experimental treatment of fire processes in fuel-Lined, ventilated passages is presented. Initially a radially well mixed axial flow condition is considered. Experiments are first performed in non-stratified flow conditions where fire propagation and gas temperature histories are acquired from liquid and solid fuelled fires. Theory and experiment;display transient fire propagation for typical duc

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26

Menezes, Dânia Catarina Costa Alpoim. "Desenvolvimento de métodos expeditos para a caraterização das propriedades finais de diferentes substratos." Master's thesis, 2017. http://hdl.handle.net/1822/50039.

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Dissertação de mestrado em Técnicas de Caraterização e Análise Química<br>As propriedades finais e o desempenho dos materiais são caraterísticas apreciadas por uma sociedade cada vez mais preocupada com o conforto e com fatores de segurança dos materiais com os quais contactam no seu dia-a-dia. Assim, este estudo teve como objetivo o desenvolvimento de métodos expeditos que permitissem avaliar o desempenho de diferentes materiais em termos de sensação térmico ao toque e de retardância à chama. No que respeita à perceção térmica ao toque, à temperatura ambiente, foram efetuados estudos qu

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