The influence of oxygen concentration on fuel parameters for fire modeling

Tewarson, A.; Lee, J.L.; Pion, R.F.

doi:10.1016/s0082-0784(81)80061-6

Cited by 96 publications

(98 citation statements)

References 1 publication

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“…Some selected data for the average steady-state values of V and QS"h are listed in Table 1. It should be pointed out that for nO 2 0.3 ,em qf ] reaches an asymptotic value, comparable to values expected 2in large-scale fires [6,8]; the data listed in Table 1 thus are expected to represent large-scale fire propagation behavior of cables.…”

Section: Fire Propagationsupporting

confidence: 66%

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Fire Propagation Behavior Of Electrical Cables

Tewarson¹,

Khan²

1989

Fire Safety Science - Proceedings of the 2nd International Symp

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Results are presented for the vertical fire propagation for 0.508 and 1.29 m long electrical cables in oxygen concentrations of 40 and 30%, respectively. The bottom 40% of the 0.508 m long cable and 16% of the 1.29 m~ong cable are exposed to external heat flux with a peak value of 50 kW/m. In the experiments, measurements are made for heat release rates, generation rates of chemical compounds and optical density of smoke.The vertical fire propagation rate for cables is found to be proportional to the ratio of the chemical heat release rate to thermal response, a relationship suggested by various fire propagation theories. Conditions where self-sustained fire propagation is not expected to occur have been identified: 1) critical or minimum heat flux for ignition> 20 kW/m 2; 2) vertical fire propagation rate V < 1.0 x 10-3 m/s; and 3) -chemical heat release rate/thermal response-< 0.55 sec-l 12 . These conditions are satisfied in larger-scale fire propagation experiments for cables. The analysis suggests that it is possible to design a small-scale standard fire test for cables based on ignition, fire propagation and heat release rate.

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Section: Fire Propagationsupporting

confidence: 66%

“…It has been shown that qfl increases with the mole fraction of 02' nO ' in the environment [6]. Also, under fixed values of velocity and pr~ssure, V increases with nO [3].…”

Section: Concepts Ignition and Fire Propagation Ratementioning

confidence: 97%

Fire Propagation Behavior Of Electrical Cables

Tewarson¹,

Khan²

1989

Fire Safety Science - Proceedings of the 2nd International Symp

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“…For the assessment of flame heat flux, 4q , expected in large-scale 5 fires, 0.10 x 0.10 m, samples with edges covered tightly with heavy duty aluminum foil were burned in 40% oxygen concentration without the external heat flux [7]. Mass loss rate was measured and Eq.…”

Section: Itmentioning

confidence: 99%

Flammability Characteristics of Fiber-Reinforced Composite Materials

Tewarson¹

1990

ACS Symposium Series

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The findings in this repori are not to be construed as an official Otesarument of the Arrmy position, unleu so desig~nated by other authorized docurtients. Mention of any trade narnes or mnanufacturers in this reportshall not be construed as advertising nar as an official indorsemenan or approvtal of such products or comnpanies by the Limited States Govermnmient. OISPOSITION INSTRUCTIONSOigllrov wthit ro6ot whom 0 is m orger miiilod. of the study was to assess the flammability charaoteristios of FRC materials using small-scale experiments.In the study, five FRC samples (about 3 to 45 mm in thickness) were examined.Results from the study showed that FRC materials have high resistance to ignition, a high heat of gasification and a low Fire Propagation Index (FPI), indicating that self-sustained tire propagation is expected to be difficult for these materials (fires are not expected to propagate beyond the ignition zone). Thus, these results suggest that FRC materials would not present as severe a fire ard as ordinary oombustibies; i.e., cellulosics and most plastios.

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“…Although considerable effort has been expended (73,74,81,82,86,122,123,131) we are a long way from understanding the full process of flame combustion. All of the quantities required for fire modeling, soot production, radiation, fraction of heat release, residual unburned fuel and toxic products are now obtained from incomplete (for this purpose) experimental results (138). All of this required information will be supplied by a complete theory of diffusion flames although some of the information may forever best be obtained empirically because of the joint complications of chemical kinetics and turbulence.…”

Section: The Firementioning

confidence: 99%

The Needed Fire Science

Emmons¹

1986

Fire Saf. Sci.

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The influence of oxygen concentration on fuel parameters for fire modeling

Cited by 96 publications

References 1 publication

Fire Propagation Behavior Of Electrical Cables

Fire Propagation Behavior Of Electrical Cables

Flammability Characteristics of Fiber-Reinforced Composite Materials

The Needed Fire Science

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