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On the jet penetration height in fluidized beds with two vertical jets-PowderT.pdf

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On the jet penetration height in fluidized beds with two vertical jets-PowderT

/locate/powtec Powder Technology 133 (2003) 216–227On the jet penetration height in fluidized beds with two vertical jets R.Y. Honga,*, Q.J. Guob, G.H. Luoc, J.-Y. Zhangd, J. Dinge aDepartment of Chemistry and Chemical Engineering, Soochow University, Soochow 215006, China bDepartment of Solids Processing, Technical University of Hamburg-Harburg, Verfahrenstechnik I, 21071 Hamburg, Germany cDepartment of Chemical Engineering, Tsinghua University, Beijing 100083, China dDepartment of Chemical Engineering, Fuzhou University, Fuzhou 350002, China eLucent Technologies, Mask Realization Group, 555 Union Blvd., 22Y-037 JM, Allentown, PA 18103, USAReceived 29 November 2002; received in revised form 1 May 2003; accepted 1 May 2003Abstract Recent studies on jet penetration height in literature were reviewed. Double-jet penetration in fluidized beds was investigated both experimentally and numerically. The experimental investigation was performed in a 300 51 mm two-dimensional gas–solids fluidized bed with two vertical jets, and the jet penetration height was measured. Different kinds of particles were tested in turn. The numerically predicted jet penetration heights were from the solution of a hydrodynamic model describing the gas–solids fluidization. The hydrodynamic model is based on the kinetic theory for fluidization and K–ek turbulence model for gas phase. The governing partial differential equations were solved using the modified Inter Phase Slip Algorithm (IPSA) method. The formation mechanism of jets was analyzed and the interaction of two vertical jets was reconstructed using this model. Numerical results indicated that the flow pattern of a two-jet system could be classified into three categories: isolated jets, transitional jets, and interacting jets. The criterions for those flow regions were found. The effects of jet characteristics (jet velocity, nozzle width, and the distance between two jets), particle properties (particle diameter, particle sphericity, and