Experimental and numerical study of CO2 plume diffusion in a confined space |
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| Institution: | 1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui, 230026, China;2. Suzhou Key Laboratory of Urban Public Safety, Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, Jiangsu, 215123, China;1. College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao, 266590, China;2. Mine Disaster Prevention and Control-Ministry of State Key Laboratory Breeding Base, Shandong University of Science and Technology, Qingdao, 266590, PR China;3. Qingdao Intelligent Control Engineering Center for Production Safety Fire Accident, Qingdao, 266590, PR China;1. Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany;2. thuba AG, Basel, Switzerland;3. Otto-von-Guericke-Universität Magdeburg, Magdeburg, Germany;1. Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou, 310027, China;2. Renewable Energy Research Group (RERG), Department of Building Environment and Energy Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, Jiangsu, 210009, China;2. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, Nanjing, Jiangsu, 210009, China;1. Jiangsu Key Laboratory of Hazardous Chemicals Safety and Control, College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 210009, China;2. School of Environment and Safety Engineering, Changzhou University, Changzhou, 213164, Jiangsu, China;3. School of Materials Engineering, Changshu Institute of Technology, Changshu, 215500, China;4. Department of Safety, Health, and Environmental Engineering, National Yunlin University of Science and Technology, 123, University Rd., Sec. 3, Douliou, Yunlin, 64002, Taiwan, ROC;5. BASF Corporation, 1609 Biddle Avenue, Wyandotte, MI, 48192, USA |
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| Abstract: | In this paper, heavy gas diffusion in a confined space has been investigated. The effects of barrier and source intensity on CO2 diffusion are explored by the small-scale experiments and computational fluid dynamics (CFD) methods. Six different turbulence models are selected to predict the gas concentrations. By comparing these experimental values with the simulated ones, it is found that all models can effectively predict the concentration variation with time, and SST k-ω model is most close to the ideal model compared with others. Three source-barrier distances and three CO2 flow rates have been set up for the study. In this confined space, the main flow is concentrated in the region near the ground. The existence of barriers in the space will have a dilution effect on the high-concentration plume near the ground of the near-source area and a barrier effect on the low-concentration plume in the far-source area. The changes in source intensity have notable impact on the gas concentrations. This study can provide an experimental basis for the risk assessment in the confined spaces, as well as an experimental and data reference for large-scale CFD simulations. |
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| Keywords: | Confined space Heavy gas diffusion Turbulence modeling Barriers CFD simulation |
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