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Heat transfer from immersed vertical tube in a fluidized bed of group A particles near the transition to the turbulent fluidization flow regime
Authors:A Stefanova  HT Bi  CJ Lim  JR Grace
Affiliation:1. State Key Laboratory of Coal Mining and Clean Utilization, Beijing Key Laboratory of Coal Based Carbon Materials, Beijing Research Institute of Coal Chemistry, China Coal Research Institute, Beijing 100013, China;2. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;1. School of Electric Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province, China;2. Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, Canada V6T 1Z3;3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, Hubei Province, China;1. National Energy Technology Laboratory, Morgantown, WV 26507, United States;2. AECOM, Morgantown, WV 26505, United States;1. Paul Scherrer Institute, 5232 Villigen PSI, Switzerland;2. Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands;1. School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;2. Laboratory for Simulation and Modelling of Particulate Systems, Department of Chemical Engineering, Monash University, Clayton, VIC 3800, Australia;3. Department of Mechanical Engineering, Sultan Ageng Tirtayasa University, Jl. Jend. Sudirman KM 3, Cilegon, Banten, Indonesia
Abstract:Experiments were performed in a 0.29 m ID fluidization column to investigate heat transfer from a vertical tube immersed in a bed of 70 μm FCC particles in the range of superficial velocities close to the transition to the turbulent fluidization regime. The results show that the transition is a gradual process and that the changing hydrodynamics affect the heat transfer. The highest heat transfer coefficients were found in the range of superficial gas velocities where the transition to turbulent regime occurred. Radial profiles of heat transfer coefficient were almost flat in the turbulent fluidization regime and changed very little with increasing superficial gas velocity.
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