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Issue title: III Congress of Theoretical and Computational Physical Chemistry, 2–4 December 2010, Altos de Pipe, Caracas, Venezuela
Guest editors: Humberto Soscunxy, Fernando Ruettez and Anibal Sierraltaz
Article type: Research Article
Authors: Ortiz, Jaime. A. Rieraa | Zeppieri, Susanab; * | Rojas-Solorzano, Luisc | Derjani-Bayeh, Sylvanaa
Affiliations: [a] TADiP Group, Department of Thermodynamics and Transport Phenomena, Caracas, Venezuela | [b] Transport Phenomena Group, Department of Thermodynamics and Transport Phenomena, Caracas, Venezuela | [c] Department of Energy Conversion and Transport, Simón Bolívar University, Caracas, Venezuela | [x] Centro Tecnológico, Instituto Venezolano de Investigaciones Científicas, IVIC, Caracas, Venezuela | [y] Departamento de Química, Facultad Experimental de Ciencias, La Universidad del Zulia LUZ, Maracaibo, Venezuela | [z] Centro de Química, Instituto Venezolano de Investigaciones Científicas, IVIC, Caracas, Venezuela
Correspondence: [*] Corresponding author: Susana Zeppieri, Transport Phenomena Group, Department of Thermodynamics and Transport Phenomena, Caracas, Venezuela. Tel.: +58 212 9063758; Fax: +58 212 9063743; E-mail: zeppieri@usb.ve.
Abstract: The hydrodynamics of a dispersed air-water system within a spouted column with a concentric draft tube and a conical base is simulated using CFD based on a two-fluid Euler-Euler (E-E) modeling framework and k-𝜀 two-equation turbulence closure. The interaction between the dispersed gas phase and the continuous liquid phase is characterized by bubble-liquid interphase forces (drag, turbulent dispersion and lift forces). The Ishii-Zuber drag model [1] and Grace adjusted drag model [2], the latter represented by: CDGrace,dense = υgpCDGrace, are compared for their capability to match experimental gas hold-up. Numerical results of Reynolds-averaged Navier-Stokes equations with k-𝜀 two-equation turbulence closure model when compared with Pironti experimental data [3] indicated that both drag models, predicted the air hold-up within experimental errors. Furthermore, Ishii-Zuber liquid-gas drag model consistently provided better agreement with experimental results; it correctly determines the hold-up within 0.14%. Numerical agreement with adjusted Grace liquid-gas drag model, is exponent dependent (4⩽p⩽−0.5), turning down that the best computed hold-up is within 0.44% for p=0.5.
Keywords: CFD, interfacial drag models, holdup, spouted bed column, k-ε
DOI: 10.3233/JCM-2012-0414
Journal: Journal of Computational Methods in Sciences and Engineering, vol. 12, no. 4-6, pp. 269-281, 2012
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