Other affiliations: National Institute for Occupational Safety and Health, National Institute of Standards and Technology, University of Science and Technology of China
Bio: Wei Tang is an academic researcher from University of Maryland, College Park. The author has contributed to research in topics: Flame spread & Heat flux. The author has an hindex of 13, co-authored 20 publications receiving 624 citations. Previous affiliations of Wei Tang include National Institute for Occupational Safety and Health & National Institute of Standards and Technology.
TL;DR: In this article, Wu et al. investigated the effect of vehicular blockage at the upstream of the fire source on the buoyancy driven back-layering length and critical velocity in a longitudinal ventilated tunnel.
TL;DR: In this article, the authors investigated the buoyancy-driven smoke flow layering length (both upstream and downstream) beneath the ceiling with combination of point extraction and longitudinal ventilation in tunnel fires.
TL;DR: In this article, the effectiveness of different ventilation modes in case of a train fire in a subway station was investigated by using the simulation of fire dynamics in a Fire Dynamics Simulator (FDS), and the results showed that appropriate activation of the air supply system can improve the efficiency of the ventilation system in smoke control and vice versa.
TL;DR: Li et al. as discussed by the authors presented an experimental investigation and non-dimensional global correlation of maximum gas temperature beneath ceiling with blockage (vehicle) at different distance from fire source in a longitudinal ventilated tunnel.
01 Jan 2015
TL;DR: In this paper, the authors quantified experimentally the evolution of heat feedbacks through conduction, convection and radiation in medium square pool fires with horizontal cross air flows ranged in 0-3.0m/s.
Abstract: This paper quantifies experimentally the evolution of heat feedbacks through conduction, convection and radiation in medium square pool fires (10–25 cm) with horizontal cross air flows ranged in 0–3.0 m/s. Ethanol and heptane are used as representative fuels producing typically less-sooty and sooty flames. Results show that the overall conduction heat feedback flux through the four sides increases with cross air flow speed, being more prominent for smaller pools than for larger ones. And the rate of overall conduction heat feedback increment is more prominent for heptane, of which the rate of increase with flow speed nearly 2 times that of ethanol. Meanwhile, the radiation heat feedback declines with cross air flow speed, with its contribution fraction nearly negligible at larger flow speeds for both fuels. The convection feedback fraction increases with cross air flow speed. Its increment is more prominent (a) for heptane (increasing fast with flow speed to be even the dominate one among the three heat feedbacks) than ethanol (increasing slowly with flow speed; being nearly constant and maintaining to be the dominant one); and (b) for larger pools than for smaller ones. The changing of dominant heat feedback mechanism with cross air flows, results in the change of the scaling behavior of the mass burning flux with pool size. A stagnant layer solution theory is then proposed, by including fuel mass transfer Spalding number B , to describe the change of mass burning flux of different size pool fires with cross air flow speed for different fuels in relative strong cross air flows [as indicated by Froude number (Fr = u /[ gd ] 1/2 ) larger than about unity]. Experimental data are shown to be well correlated by the proposed theory.
TL;DR: In this article, the authors reviewed the physics and correlations for the burning behavior of pool fires in wind, and discussed also challenges for future research on this topic, especially for wind-blown large scale pool fires.
TL;DR: In this paper, the authors analyzed the physics characteristics of the flame plume temperature, induced by a ceiling jet and their coupling with an extraction flow, using a ceiling smoke extraction. And the results indicated that the new global model can effectively predict experimental data.
TL;DR: In this paper, a series of burning experiments were conducted in a model-scale mechanical ventilation tunnel to study the characteristics of smoke layer thickness and plug-holing with multiple point extraction system.
TL;DR: In this article, a series of experiments were carried out in a model-scale tunnel to investigate the buoyant flow stratification behaviors in a tunnel fire with complexity of combination of longitudinal ventilation and ceiling extraction, which had not been studied before.
TL;DR: In this paper, the authors investigated experimentally the thermal buoyant smoke back-layering flow length beneath the tunnel ceiling with combination ceiling extraction and longitudinal ventilation, especially focusing on the condition that the ceiling extraction is employed at upstream side of the fire source, which has not previously been reported.