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Full-Text Articles in Biomedical Engineering and Bioengineering
An Explicit Method For The Packing Limit Management In Dense Gas-Solid Flow Cfd Simulations On Both Structured And Unstructured Grids, Alberto Passalacqua, Luca Marmo
An Explicit Method For The Packing Limit Management In Dense Gas-Solid Flow Cfd Simulations On Both Structured And Unstructured Grids, Alberto Passalacqua, Luca Marmo
Alberto Passalacqua
An explicit method for limiting the volume fraction of the dispersed phase in the CFD simulations of dense gas-solid flows is described and validated both on structured and unstructured computational grids. The procedure is based on the excess solids volume correction method proposed by Lettieri et al. (2003), which has been extended in this work to non-uniform grids made of cells having different shape and size. The method has been implemented in OpenFOAM and validated through the simulation of a fludised bed in which the superficial gas velocity has been reduced to a value close to zero.
Zsm-5 Coatings On β-Sic Monoliths: Possible New Structured Catalyst For The Methanol-To-Olefins Process, B. Madani, S. Ivanova, B. Louis, Jean-Philippe Tessonnier, M. J. Ledoux, C. Pham-Huu
Zsm-5 Coatings On β-Sic Monoliths: Possible New Structured Catalyst For The Methanol-To-Olefins Process, B. Madani, S. Ivanova, B. Louis, Jean-Philippe Tessonnier, M. J. Ledoux, C. Pham-Huu
Jean-Philippe Tessonnier
Structured zeolite/silicon carbide composites were succesfully synthesized by ZSM-5 coatings deposited on macroscopic â-SiC foams with medium surface area. A homogeneous coverage of the support (30 wt % zeolite) by ZSM-5 crystals, having 1 ím average size, was reached after a double-coating procedure. The ZSM-5/â-SiC composite materials were characterized by BET, XRD, SEM, and H/D exchange methods. 27Al MAS NMR analysis revealed that all aluminum was present in a tetrahedral coordination, thus sitting in the zeolite framework. The existence of a nanoscopic layer of silica and silicon oxycarbide on the surface of the support ensures the strong anchoring of the …