The influence of multiple tubes on the tube-to-bed heat transfer in a fluidised bed |
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| Authors: | LM Armstrong S Gu KH Luo |
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| Institution: | 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;1. CIRCE – Center of Research of Energy Resources and Consumptions, Mariano Esquillor Gómez 15, 50018 Zaragoza, Spain;2. Department of Energy and Environment, Chalmers University of Technology, SE 412 96 Göteborg, Sweden |
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| Abstract: | There have been few studies modelling both flow and heat transfer in fluidised beds. The kinetic theory of granular flow (KTGF) has been used for flow prediction in the past without heat transfer modelling. In the present study, a two-fluid Eulerian–Eulerian formulation incorporating the KTGF was applied first to a tube-to-bed reactor with one immersed tube and compared with the results in the literature. The bed was then modified to introduce two and three heated tubes. The effects on the flow and temperature distribution, local heat transfer coefficients and averaged heat transfer coefficients over a 3.0 s time period were carried out. Results showed that increasing the number of tubes promotes heat transfer from tubes to the particles and flow. The heat transfer coefficients extracted from the single-tube to three-tube cases were analysed in detail, confirming the importance of linking flow/particle and heat transfer calculations. |
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