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Search Publications by: Anthony Hamins (Fed)

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Displaying 151 - 175 of 194

Suppression of Ignition Over a Heated Metal Surface

January 1, 1998
Author(s)
Anthony P. Hamins, Robert P. Borthwick
The effectiveness of various agents including N2, C3HF3, C3HF7, CF3Br and CF3I was compared in suppressing the ignition of stoichiometric mixtures of methane/air, propane/air, and ethene/air. Measurements were made of the critical ignition temperature of

Flame Suppression by Halon Alternatives (NISTIR 6030)

June 1, 1997
Author(s)
Anthony P. Hamins
A series of experimental measurements were conducted in a baffle stabilized turbulent jet spray flame and a baffle stabilized pool fire in an effort to provide an improved understanding of the influence of various parameters on the processes controlling

Experimental Observations of PMMA Spheres Burning at Reduced Gravity

May 19, 1997
Author(s)
Jiann C. Yang, Anthony P. Hamins, M Glover, M D. King
Polymer combustion is a very complicated process which involves the coupling of gas-phase combustion, melting, pyrolysis and possible charring of the condensed phase. Although only a few studies on the combustion of a spherically shaped polymer have been

Effect of Sample Size on the Heat Release Rate of Charring Materials

March 3, 1997
Author(s)
S J. Ritchie, Kenneth D. Steckler, Anthony P. Hamins, Thomas G. Cleary, Jiann C. Yang, Takashi Kashiwagi
The burning of a horizontal wood slab situated atop an insulating substrate was modeled using three coupled submodels for the gas-phase, wood, and substrate processes. A global analytical model was used to determine the radiative and convective heat

CHEMICAL AND PHYSICAL INFLUENCES OF HALOGENATED FIRE SUPPRESSANTS

January 1, 1997
Author(s)
Valeri I. Babushok, Anthony P. Hamins, Wing Tsang, T Noto
The specific mechanisms by which fire suppressants influence flame properties have been determined on the basis of computer simulations. Attention is focussed on the relative contributions from physical and chemical processes. Chemical effects are most

Inhibitor Influence on the Bistability of a CSTR

January 1, 1997
Author(s)
Valeri I. Babushok, T Noto, Donald R. Burgess Jr., Anthony P. Hamins, Wing Tsang
Methane combustion in a continuously stirred flow tank reactor (CSTR) in the presence and absence of chemical inhibitors such as CF3I, CF3Br, CF3H, and a chemically inert gas with high heat capacity is simulated with the CHEMKIN program. The aim of the

Radiative Emission Fraction of Pool Fires Burning Silicone Fluids

January 1, 1997
Author(s)
R Buch, Anthony Hamins, K Konishi, D. Mattingly, Takashi Kashiwagi
The steady-state mass burning flux and the radiative flux profiles to the surroundings were measured for a series of burning silicone fluids and organic fuels in 0.1-m, 0.3-m, 0.6-m and 1-m pool burners. Short-chain silicone oligomers and aliphatic

Influence of CF3I, CF3Br, and CF3H on the High-Temperature Combustion of Methane

December 1, 1996
Author(s)
Valeri I. Babushok, T Noto, D R. Burgess, Anthony P. Hamins, Wing Tsang
The effects of a number of flame retardants (CF3I, CF3Br, and CF3H) on the high-temperature reactions of methane with air in a plug flow reactor are studied by numerical simulations using the Sandia Chemkin Code. The dependence of (a) the ignition dely and

Effect of Halogenated Flame Inhibitors on C1-C2 Organic Flames

July 28, 1996
Author(s)
T Noto, Valeri I. Babushok, Donald R. Burgess Jr., Anthony P. Hamins, Wing Tsang, A W. Miziolek
The influence of CF3Br, CF3I, CF4, CHF3, C2F6, and C2HF on laminar flame propagation in mixtures of CH4, CH3OH, C2H6, and C2H4 with air has been determined by numerical simulaitons. Comparisons are made with experimental results and earlier calculations

Global Properties of Gaseous Pool Fires

July 28, 1996
Author(s)
Anthony P. Hamins, K Konishi, Robert P. Borthwick, Takashi Kashiwagi
Global flame properties were measured as a function of fuel mass in a series of experiments conducted on gaseous pool fires burning in a quiescent environment. The measurements included radiative heat loss, heat transfer to the burner, and sensible

Suppression of a Baffle-Stabilized Spray Flame by Halogenated Agents

July 28, 1996
Author(s)
Anthony P. Hamins, Cary Presser, L Melton
A series of experiments was conducted on baffle-stabilized spray flames in an effort to provide an improved understanding of the influence of various parameters on the processes controlling flame suppression. Measurements were made of the agent mass

Polymer Combustion and New Flame Retardants

May 20, 1996
Author(s)
Takashi Kashiwagi, Anthony P. Hamins, Kenneth D. Steckler, Jeffrey W. Gilman
The combustion of polymers is a complex coupled process characterized by energy feedback from a flame to the polymer surface and subsequent gasification of the polymer to generate combustible degradation products. Energy feedback characteristics for two

Heat Release Mechanisms in Inhibited Laminar Counterflow Flames (Journal)

January 1, 1996
Author(s)
Ki Y. Lee, Don J. Cha, Anthony Hamins, I K. Puri
Due to the participation of inhibitors in flame chemistry, it is difficult to concurrently characterize the complex interaction between their cooling action, and the chemical inhibition (which decrease temperature), and their contribution of heat release

THE INFLUENCE OF HALOGENATED FIRE SUPPRESSANTS ON THE COMBUSTION OF C1-C2 HYDROCARBONS

January 1, 1996
Author(s)
Valeri I. Babushok, Donald R. Burgess Jr., T Noto, Anthony P. Hamins, Wing Tsang, A W. Miziolek
Numerical simulations of the combustion of a number of fuels; (CH,, CH,OH, C2H,, GH, and C&J in air, in the presence and absence of fire suppressants, (CF,Br, CFJ, CF,, Cm3, GF6, and QF5H) have been carried out The simulations considered reactions in a

Suppression of Engine Nacelle Fires (NIST SP 890)

November 1, 1995
Author(s)
Anthony P. Hamins, Thomas G. Cleary, P. Borthwick, N Gorchkov, Kevin B. McGrattan, Glenn P. Forney, William L. Grosshandler, Cary Presser, L Melton
A series of experimental measurements were conducted and simple models were developed in an effort to provide an improved understanding of the influence of various parameters on the processes controlling flame stability in engine nacelle applications. The

Suppression Criteria in Engine Nacelle Fires

October 21, 1995
Author(s)
Anthony P. Hamins, Thomas G. Cleary
A series of experimental measurements were conducted and simple models were developed in an effort to provide an improved understanding of the influence of various parameters on the processes controlling flame stability in engine nacelle applications. The

Suppression of Ignition Over a Heated Metal Surface

September 10, 1995
Author(s)
Anthony P. Hamins, P. Borthwick, Cary Presser
The objective of this work is to investigate the effectiveness of various agents in suppressing flame ignition. Experiments were conducted to determine the amount of agent needed to suppress the ignition of a gaseous propane flow over a heated metal disk

Volume Rendering of Pool Fire Data

July 1, 1995
Author(s)
H. Rushmeier, Anthony Hamins, M Y. Choi
In a pool fire, an ignited puddle or pool of liquid fuel burns in the atmosphere. Understanding pool fires is important to devising methods to control the hazards resulting from spilled fuels. In this case study we consider techniques for visualizing the

Characteristics of Pool Fire Burning

June 20, 1995
Author(s)
Anthony P. Hamins, Takashi Kashiwagi, R Buch
The structure and energetics of hydrocarbons burning in a pool fire configuration are reviewed. Examples of non-hydrocarbons are also presented. The character and structure of pool fires are discussed with special regard to the flame shape, flame pulsation

Tomographic Reconstruction of the Local PDFS of Soot Volume Fraction and Temperature

April 23, 1995
Author(s)
Y. R. Sivathanu, Anthony Hamins, Robert Hagwood, Takashi Kashiwagi
Deconvolution of local properties from line-of-sight measurements is important in a wide variety of applications such as x-ray tomography, nuclear magnetic resonance imaging, atmospheric sciences, optical inteferometry and flow field diagnostics. The Radon