A new drag correlation for monodisperse suspensions using immersed boundary method simulations

Y. Tang, S. H.L. Kriebitzsch, E. A.J.F. Peters, M. A. van der Hoef, J. A.M. Kuipers

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademicpeer review

Samenvatting

Quantitative description of gas-solid momentum transfer is of fundamental importance to predict the behavior of suspensions of sedimenting or fluidized particles. It is usually characterized by the dependence of normalized average drag force Fd on mean Reynolds number (Re) and solids volume fraction (φ). In this work we report detailed direct numerical simulation (DNS) results of interphase momentum transfer in flows past fixed assemblies of monodisperse spheres using an iterative immersed boundary method (IBM). A methodology has been applied for all the IBM simulations, which was validated to obtain highly accurate results of drag force and flow velocity field at relatively low computational cost. Simulations were performed for Re ranging from 50 to 1000 and φ varying from 0.1 to 0.6. A new drag correlation is finally obtained with an average standard deviation of only 4.0% from the underlying IBM simulation data. In comparison to some correlations reported in literature, this new correlation gives more reliable predictions of the drag force for high Re and dense packings. It is considered to be so far the best possible expression of the drag law for gas-solid flows. In addition, this new drag correlation can be used in large-scale models, in which the interphase momentum exchange is not directly resolved, thus finally enhancing the predictive capability of computational fluid dynamics (CFD) simulations for gas-solid flows.

Originele taal-2Engels
Titel11th International Conference on Fluidized Bed Technology, CFB 2014
Pagina's347-352
Aantal pagina's6
StatusGepubliceerd - 1 jan. 2014
Evenement11th International Conference on Fluidized Bed Technology (CFB 2014) - Beijing, China
Duur: 14 mei 201417 mei 2014

Congres

Congres11th International Conference on Fluidized Bed Technology (CFB 2014)
Land/RegioChina
StadBeijing
Periode14/05/1417/05/14

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