Volume 2: Heat Transfer Enhancement for Practical Applications; Heat and Mass Transfer in Fire and Combustion; Heat Transfer In 2013
DOI: 10.1115/ht2013-17100 View full text |Buy / Rent full text
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Abstract: In this paper, the neutral plane in a compartment fire was measured by Optical Schlieren Photography. This is a highly sensitive, optical, nonintrusive and remote technique to visualize fluid flow, utilizing refraction when light passes through air of different densities. The positions and variations of hot air flowing out of an opening can be determined clearly. A 1/14 scale model room burning candles inside was used. Hot air induced by the candle flame flowing out a 15 cm opening was observed. Thermocouples … Show more

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“…The smoke layer interface height relating to the neutral plane height through the opening is an important parameter in relation to evacuation of occupants staying at lower levels and to thermal radiation received by firefighters. Experiments were carried out in a vertical shaft model [14,15] with ventilation provided from the side walls. Flame swirling can be generated in a tall hall with a large volume as in Figure 1.…”
Section: Figure 1 a Typical Tall Hall In Hong Kongmentioning
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“…The smoke layer interface height relating to the neutral plane height through the opening is an important parameter in relation to evacuation of occupants staying at lower levels and to thermal radiation received by firefighters. Experiments were carried out in a vertical shaft model [14,15] with ventilation provided from the side walls. Flame swirling can be generated in a tall hall with a large volume as in Figure 1.…”
Section: Figure 1 a Typical Tall Hall In Hong Kongmentioning
“…Those hot gas and cool air would have different refractive indices due to their temperature differences. BOS technique can then be applied to determine the boundary location of hot gases and cool air, which is in fact the neutral plane position of the opening in a compartment fire [14,15]. Air exchange flow pattern across the corner gap of the shaft model could be determined clearly using the BOS technique [17].…”
Section: Scale Model Experimentsmentioning