Extinction Studies of Propane/Air Counterflow Diffusion Flames: The Effectiveness of Aerosols PDF Download
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Languages : en
Pages : 0
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The fire suppression effectiveness of solid aerosols as suitable halon replacements has examined. Experiments were performed in a counterflow diffusion burner, consisting of two 1 cm i.d. tubes separated by 1 cm. Aerosols were delivered to propane/air flames in the air flow. Both sodium bicarbonate (NaHCO3) and potassium bicarbonate (KHCO3) powders were examined. The NaHCo3 and KHCO3 powders were separated into various size groupings (
Author:
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Category :
Languages : en
Pages : 0
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The fire suppression effectiveness of solid aerosols as suitable halon replacements has examined. Experiments were performed in a counterflow diffusion burner, consisting of two 1 cm i.d. tubes separated by 1 cm. Aerosols were delivered to propane/air flames in the air flow. Both sodium bicarbonate (NaHCO3) and potassium bicarbonate (KHCO3) powders were examined. The NaHCo3 and KHCO3 powders were separated into various size groupings (
Author: Nasser Ashgriz
Publisher: Springer Science & Business Media
ISBN: 1441972641
Category : Technology & Engineering
Languages : en
Pages : 922
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Atomization and sprays are used in a wide range of industries: mechanical, chemical, aerospace, and civil engineering; material science and metallurgy; food; pharmaceutical, forestry, environmental protection; medicine; agriculture; meteorology and others. Some specific applications are spray combustion in furnaces, gas turbines and rockets, spray drying and cooling, air conditioning, powdered metallurgy, spray painting and coating, inhalation therapy, and many others. The Handbook of Atomization and Sprays will bring together the fundamental and applied material from all fields into one comprehensive source. Subject areas included in the reference are droplets, theoretical models and numerical simulations, phase Doppler particle analysis, applications, devices and more.
Author: Robert J. Bacigalupi
Publisher:
ISBN:
Category : Mach number
Languages : en
Pages : 28
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Author: G. L. Pellett
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Category :
Languages : en
Pages :
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Author: Leonard F. Truett
Publisher:
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Category :
Languages : en
Pages : 272
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Category :
Languages : en
Pages : 11
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The Combustion Dynamics Section of the Navy Technology Center for Safety and Survivability is actively involved in addressing US Navy needs for fire protection, concentrating on the effectiveness of current and future fire extinguishing agents, with the responsibility to recommend and help design Navy shipboard total flooding fire suppression systems. We are currently examining several replacement agents and alternative suppression technologies including the use of aerosols and powders. This paper describes recent collaborative work with Kidde International on the flame extinction properties of various bicarbonate powders. We have examined the concentration of bicarbonate powders required to extinguish both laboratory counterflow propane-air diffusion flames and small obscured n-heptane pan fires. Extinction information as a function of powder composition and size has been obtained. Within experimental uncertainty, smaller particles were more effective than larger ones. Potassium bicarbonate was more effective than sodium bicarbonate for each particle size studies. Similar dependence on size and powder composition was observed in both the counterflow diffusion flame and small chamber pan fire tests. Powder extinction data are given as well as implications of the findings.
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Category :
Languages : en
Pages : 65
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Computations are performed to examine the effectiveness of mono-disperse water droplets in extinguishing a co-flow, propane diffusion flame by injecting the droplets into the air stream. The calculations show that the droplets entrained into the reaction kernel at the flame base are crucial for extinction. The reaction kernel detaches from the burner rim and blows-off when the droplet concentration is increased to a critical value (extinction concentration). At the critical value, the maximum chain-branching reaction (H2+O=OH+H) rate in the reaction kernel was found to be reduced by a factor of 5 in our computations. A large decrease in the reaction rate indicates that the maximum heat generations rate and Damkholer number are too low to sustain the flame, and cause the flame blow-off. Large drops are more effective than small drops, and the extinction concentration of water increases from 10.5% to 15% by mass as the size is reduced from 32 to 4 micro m. As the droplet size is increased further (>32 micro m), the trend will reverse as the evaporation rates get too small despite increased penetration of flame core by the drops.
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1064
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Author:
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Category :
Languages : en
Pages :
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Author: James Stephen Kistler
Publisher:
ISBN:
Category :
Languages : en
Pages : 210
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