Further study on the influence of particle coating on fluidized bed heat transfer |
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| Affiliation: | 1. Department of Applied Physics and Electronics, Umeå University, SE-90187 Umeå, Sweden;2. Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC, Canada V6T 1Z3;1. State Key Laboratory of Engines, Tianjin University, Tianjin 300072, PR China;2. Centre for Advanced Powertrain and Fuels, Brunel University, London, UK;1. Institute of Solids Process Engineering, Hamburg University of Technology, Denickestr. 15, 21073 Hamburg, Germany;2. Nestlé Research Center Lausanne, PO Box 44, 1000 Lausanne 26, Switzerland;3. Nestlé Product Technology Center Konolfingen, Nestlestrasse 3, 3510 Konolfingen, Switzerland;4. Nestlé Beverages Business Unit, Av. Nestlé 55, 1800 Vevey, Switzerland;1. Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, N6G 5B9, Canada;2. School of Chemical Engineering, Tianjin University, Tianjin, 300072, China;3. School of Health Sciences, Fanshawe College and Department of Microbiology and Immunology, UWO, Canada |
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| Abstract: | Heat transfer to an immersed sphere from fluidized uncoated sand particles of different mean size and size distribution is compared with that from coated sand particles of equal size extracted from two full-scale fluidized bed boilers for different superficial gas velocities and mean particle diameters from 350 to 646 μm. The thin coating on the sand bed particles from full-scale boilers was found to have a significant effect on the heat transfer coefficient, while the particle size distributions, as well as coating thickness, had little or no influence on the heat transfer coefficients for the conditions investigated. |
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