Calculating combined buoyancy- and pressure-driven flow through a shallow,horizontal, circular vent: Application to a problem of steady burning in a ceiling-vented enclosure |
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| Affiliation: | 1. Maritime Risk Assessment Department, National Maritime Research Institute, National Institute of Maritime, Port and Aviation Technology, 6-38-1, Shinkawa, Mitaka, Tokyo 181-0004, Japan;2. Faculty of Environment and Information Sciences, Yokohama National University, 79-7, Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan;1. School of Civil Engineering, Beijing Jiaotong University, Beijing, China;2. Beijing Key Laboratory of Track Engineering, Beijing Jiaotong University, China;3. Research Centre for Fire Engineering, Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China;2. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, Shandong 250061, China;3. School of Urban Construction, Yangtze University, Jingzhou, Hubei 434023, China;1. School of Civil Engineering, Hefei University of Technology, Hefei, 230009, Anhui, China;2. Tianjin Fire Research Institute, Tianjin, 300381, China |
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| Abstract: | A model was developed previously for calculating combined buoyancy- and pressure-driven (i.e. forced) flow through a shallow, circular, horizontal vent where the vent-connected spaces are filled with fluids of different density in an unstable configuration (density of the top fluid is larger than that of the bottom). In this paper the model is summarized and then applied to the problem of steady burning in a ceiling-vented enclosure where normal atmospheric conditions characterize the upper-space environment. Such fire scenarios are seen to involve a zero to relatively moderate cross-vent pressure difference and bidirectional exchange flow between the enclosure and the upper space. A solution to the problem leads to a general result that relates the rate of energy release of the fire to the area of the vent and the temperature and oxygen concentration of the upper portion of the enclosure environment. This result is seen to be consistent with previously published data from experiments involving ceiling-vented fire scenarios. |
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