Experiments and Modeling of Large-scale Benchmark Enclosure Fire Suppression

Yoon, Sam S.; Figueroa, Victor G.; Brown, Alexander L.; Blanchat, Thomas K.

doi:10.1177/0734904109104503

Cited by 7 publications

(2 citation statements)

References 35 publications

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“…[1][2][3] An important new application of this technology is in electronic cooling, where the growing power consumption and decreasing sizes pose increasingly challenging heat dissipation demands. 4,5 Other common situations in which cold drops impact hot surfaces are found in internal combustion engines, 6,7 quenching of aluminum and steel, 8 re suppression 9,10 and others.…”

Section: Introductionmentioning

confidence: 99%

The Leidenfrost temperature increase for impacting droplets on carbon-nanofiber surfaces

et al. 2014

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Droplets impacting on a superheated surface can either exhibit a contact boiling regime, in which they make direct contact with the surface and boil violently, or a film boiling regime, in which they remain separated from the surface by their own vapor. The transition from the contact to the film boiling regime depends not only on the temperature of the surface and the kinetic energy of the droplet, but also on the size of the structures fabricated on the surface. Here we experimentally show that surfaces covered with carbon-nanofibers delay the transition to film boiling to much higher temperatures compared to smooth surfaces. We present physical arguments showing that, because of the small scale of the carbon fibers, they are cooled by the vapor flow just before the liquid impact, thus permitting contact boiling up to much higher temperatures than on smooth surfaces. We also show that as long as the impact is in the film boiling regime, the spreading factor of impacting droplets is consistent with the We(3/10) scaling (with We being the Weber number) as predicted for large We by a scaling analysis.

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Section: Introductionmentioning

confidence: 99%

The Leidenfrost temperature increase for impacting droplets on carbon-nanofiber surfaces

et al. 2014

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“…The predictions agreed well with the experiment findings. Yoon [20] carried out the studies on fire extinction behavior using the EDC-based model [21] developed at Sandia National Laboratories. His predictions are encouraging on the basis of qualitative analysis.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Fire Dynamics with the Improved Eddy Dissipation Concept

Chen¹,

Wen²,

Xu³

et al. 2011

Fire Safety Science - Proceedings of the 10th International Sym

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The eddy dissipation concept (EDC) for turbulent combustion modeling was originally proposed by Magnussen in the Reynolds averaged Navier-Stokes (RANS) context. This study has extended it to the large eddy simulation (LES) framework. Since the fine structures in EDC are still not resolved in LES, they are modeled with SGS turbulent kinetic energy and its dissipation rate instead of the mean quantities in RANS. A new expression is proposed for the reacting fraction of the fine structures to alleviate the limitations of the original formula. Three fire cases including a 7.1 cm methane fire, a 30 cm heptane fire and a 30.5 cm methanol fire are simulated to verify the improved EDC (M-EDC), which has been implemented in the FireFOAM solver. The predictions from the M-EDC are found to be in reasonably good agreement with the measurements, while the original EDC tends to under-predict temperature and velocity.

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Fire Modeling and Its Application in Fire Investigation

Carpenter

2014

Wiley Encyclopedia of Forensic Science

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Individuals involved in the forensic investigation and analysis of fire and explosion incidents are usually tasked with rendering opinions as to the origin, cause, responsibility, and/or prevention of such incidents so that future incidents can be avoided or prevented. The essence of the investigation of fire and explosion incidents is embodied in the use of the scientific method, which has traditionally been used in the physical sciences and it forms the basis for legitimate scientific and engineering investigations. The combustion and fire sciences involve complex phenomena, and the advancement of these sciences has helped to build a technical foundation for the discipline. The challenge for the fire investigator is the practical application of fundamental knowledge to the investigation of fires. Such fundamental knowledge can be exploited through the development of models to overcome some of the complexities of the combustion phenomena that limit practical application. Mathematical fire modeling provides the fire investigator with tools for the testing of hypotheses associated with the origin and cause of a particular fire event. Even when the origin and cause of the fire is not at issue, these modeling tools can also be used to evaluate the factors that caused damage to property or injury to people. This article provides an overview of mathematical fire modeling and its application to the investigation of fire and explosion incidents.

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Experiments and Modeling of Large-scale Benchmark Enclosure Fire Suppression

Cited by 7 publications

References 35 publications

The Leidenfrost temperature increase for impacting droplets on carbon-nanofiber surfaces

The Leidenfrost temperature increase for impacting droplets on carbon-nanofiber surfaces

Large Eddy Simulation of Fire Dynamics with the Improved Eddy Dissipation Concept

Fire Modeling and Its Application in Fire Investigation

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