Suppression of Methanol Liquid Pool Fires Using Water Mist PDF Download
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Author: Kuldeep Prasad
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Languages : en
Pages :
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Author: Kuldeep Prasad
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Category : Fire extinction
Languages : en
Pages : 0
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This report is the fourth in a series dealing with numerical modeling of fire suppression using water mist. While the first two reports examined the interaction of water mist with two-dimensional methane air diffusion flames, the third report presented a numerical model for studying methanol liquid pool fires, As shown in that report, numerical results exhibited a flame structure that compared well with experimental observations and thermocouple temperature measurements. In the present report we describe results for water-mist suppression of liquid methanol pool fires. The interaction of water-mist with pulsating pool fires is studied. Time dependent heat release rate profiles and temperature profiles identify the location where the water droplets evaporate and absorb energy. Numerical results are also presented for the effect of water mist on steady methanol pool fires stabilized by a strong co-flowing air jet. The relative contribution of the various suppression mechanisms such as oxygen dilution, radiation and thermal cooling on overall fire suppression is investigated. Parametric studies are performed to determine the effect of droplet injection density, velocity and droplet diameter on entrainment and overall suppression of pool fires. These results are reported in terms of reduction in peak temperature, effect on burning rate and changes in overall heat release rate. Numerical simulations indicate that small droplet diameters exhibit smaller characteristic time for decrease of relative velocity with respect to the gas phase, and therefore entrain most rapidly into the diffusion flame. Hence for the co-flow injection case, smaller diameter droplets produce maximum flame suppression for a fixed amount of injection spray density.
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Languages : en
Pages : 0
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This report is the third in a series dealing with the numerical modeling of fire suppression using water mist. In the first report, a numerical study was described for obtaining a detail understanding of the physical processes involved during the interaction of water-mist and methane-air diffusion flames. The relative contribution of the various Suppression mechanisms was studied and detailed comparison with experimental results was provided. The second report described a computational study for optimizing water-mist injection characteristics for Suppression of co-flow diffusion flames. The effect of droplet diameter, mist injection angle (throw angle), mist density and velocity on water-mist entrainment into the flame and flame Suppression were quantified. Numerical results were presented for symmetric and asymmetric spray pattern geometries resulting from base injection and side injection nozzle orientation. The focus of this report is on numerical modeling of methanol liquid pool fires. A mathematical model is first developed to describe the evaporation and burning of liquid methanol. Then, the complete set of unsteady, compressible Navier-Stokes equations for reactive flows are solved in the gas phase to describe the convection of the fuel gases away from the pool surface, diffusion of the gases into the surrounding air and the oxidation of the fuel molecules into product species. Heat transfer into the liquid pool and the metal container through conduction, convection and radiation are modeled by solving a modified form of the energy equation. Clausius-Clapeyron relationships are invoked to model the evaporation rate of a two-dimensional pool of pure liquid methanol. The governing equations along with appropriate boundary and interface conditions are solved using the Flux Corrected Transport algorithm. Numerical results exhibit a flame Structure that compares well with experimental observations.
Author: Chuka Ndubizu
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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This report presents the results of an experimental and numerical parametric study of water mist suppression of liquid pool fires. The numerical part was conducted with small 2-D methanol pool fire, while the experiments were conducted with a 50 cm diameter pan heptane and JP8 pool fires. Analyses of results of the experimental and numerical parts lead to similar conclusions. First, the results show that base injection of droplets enhanced their suppression effectiveness by as much as two times compared to top injection. This is because the droplets evaporated within the lower region of the fire where a greater effect of oxygen dilution and water vapor higher heat capacity is fully realized. Secondly, the experimental results show that smaller droplets are more effective than larger droplets in both top and base injections. The similarity between the model predictions and the experimental data indicates that the results of the parametric study conducted with a small scale laminar pool fire can be useful in the design of water mist suppression systems for large scale fires. Finally, the experimental results show that water mist is more effective in suppressing JP8 fires than heptane fires. It is concluded that the difference in effectiveness is largely due to the additional effects of surface cooling.
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Languages : en
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Author: C. C. Ndubizu
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Category :
Languages : en
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Author:
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Category :
Languages : en
Pages : 25
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The fire suppression effectiveness of aqueous solutions is studied using an opposed-jet diffusion flame burner with a droplet/particle seeding system designed to minimize loading uncertainties. An aqueous solution is sprayed into the oxidant stream in a heated chamber. The liquid evaporates, leaving residual solid particles in the case of solid solutes. SEM imaging of residual particles indicates a mean diameter of approximately 0.5 microns. Extinction measurements are presented for a variety of phosphorus-containing compounds as well as NaCl and sodium phosphate, with different loadings, solution concentrations, and oxidants. Flame calculations with two detailed phosphorus combustion mechanisms are also performed for some cases, neglecting all particle physical effects. Experiments indicated that all additives containing phosphorus had roughly the same effect on flame suppression, per mole phosphorus added. Additives producing residual particles were somewhat more effective than those that evaporated completely, suggesting a moderate enhancement of fire suppression due to particle physical effects. However, this result is also consistent with chemical differences between additives. Synergy between water and chemical suppressants was predicted computationally but not observed experimentally. Computations underpredicted flame suppression effectiveness by at least a factor of four.
Author: Dawei Zheng
Publisher: CRC Press
ISBN: 1315752239
Category : Nature
Languages : en
Pages : 292
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The 2014 International Conference on Energy and Environment (ICEE 2014) was held June 26-27 in Beijing, China. The objective of ICEE 2014 was to provide a platform for researchers, engineers, academics as well as industry professionals from all over the world to present their research results and development activities in Energy and Environment res
Author: Emma Nichols
Publisher:
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Category :
Languages : en
Pages :
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Author: Morgan J. Hurley
Publisher: Springer
ISBN: 1493925652
Category : Technology & Engineering
Languages : en
Pages : 3510
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Revised and significantly expanded, the fifth edition of this classic work offers both new and substantially updated information. As the definitive reference on fire protection engineering, this book provides thorough treatment of the current best practices in fire protection engineering and performance-based fire safety. Over 130 eminent fire engineers and researchers contributed chapters to the book, representing universities and professional organizations around the world. It remains the indispensible source for reliable coverage of fire safety engineering fundamentals, fire dynamics, hazard calculations, fire risk analysis, modeling and more. With seventeen new chapters and over 1,800 figures, the this new edition contains: Step-by-step equations that explain engineering calculations Comprehensive revision of the coverage of human behavior in fire, including several new chapters on egress system design, occupant evacuation scenarios, combustion toxicity and data for human behavior analysis Revised fundamental chapters for a stronger sense of context Added chapters on fire protection system selection and design, including selection of fire safety systems, system activation and controls and CO2 extinguishing systems Recent advances in fire resistance design Addition of new chapters on industrial fire protection, including vapor clouds, effects of thermal radiation on people, BLEVEs, dust explosions and gas and vapor explosions New chapters on fire load density, curtain walls, wildland fires and vehicle tunnels Essential reference appendices on conversion factors, thermophysical property data, fuel properties and combustion data, configuration factors and piping properties “Three-volume set; not available separately”
