Abstract
In the present paper, CFD simulations using ANSYS-Fluent 14.5 were accomplished to study the effect of bed or sand inventory and effect of scale-up of riser on heat transfer characteristics like temperature and heat transfer coefficient. To accomplish the scale-up study, 3D CFD simulations were performed on the Circulating Fluidized Bed (CFB) risers of cross section 0.15 × 0.15 m, 0.30 × 0.30 m, and each of height 2.85 m. CFD simulations to predict heat transfer characteristics were accomplished under same operating conditions on heated portion (heater) of both risers. The walls of heater were maintained at the constant heat flux q″ = 1,000 (W/m2). Modeling and meshing were done using ProE and ANSYS ICEM CFD software, respectively. RNG k-ε model was used for turbulence modeling. Eulerian model with Gidaspow phase interaction scheme was used to simulate the two phase flow (air + sand mixture flow). Computational (CFD simulation) data was compared with experimental data for the validation purpose. After validation, further simulations were conducted on riser of cross section 0.30 × 0.30 m. Based on scale-up study, empirical correlation has been developed to predict the heat transfer coefficient.
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Patil, R.S., Mahanta, P., Pandey, M. (2015). Experimental and Computational Studies on Effects of Scale-Up of Riser on Heat Transfer Chatacterisitcs of Circulating Fluidized Bed. In: Yang, GC., Ao, SI., Gelman, L. (eds) Transactions on Engineering Technologies. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9804-4_19
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DOI: https://doi.org/10.1007/978-94-017-9804-4_19
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