TY - JOUR

T1 - Direct numerical simulations of gas-liquid-solid three phase flows

AU - Baltussen, M.W.

AU - Seelen, L.J.H.

AU - Kuipers, J.A.M.

AU - Deen, N.G.

PY - 2013

Y1 - 2013

N2 - Gas-liquid-solid three phase flows are encountered in for example the Fischer Tropsch process for the production of synthetic fuels in bubble slurry columns. To predict the hydrodynamics in large slurry bubble columns a multi-scale modeling approach can be used, which accounts for the large variation in time and length scales. In this paper, the smallest scale model has been developed using the Front Tracking model of Dijkhuizen et al. (2010b) and the Immersed Boundary model of Kriebitzsch (2011). In the Front Tracking model, each bubble is tracked separately. Furthermore, the Immersed Boundary method introduces the particle-fluid and the particle-particle (via a hard sphere model) interactions in the model. The resulting hybrid Front Tracking Immersed Boundary model is able to simulate dense three-phase flows and account for swarm effects in a fundamental manner. From our simulations we found that the relative drag coefficient of bubbles in three-phase flows seems to increase with increasing solids volume fraction. However, longer averaging periods are needed to derive a fully predictive correlation for the relative drag coefficient with respect to the solid volume fraction..

AB - Gas-liquid-solid three phase flows are encountered in for example the Fischer Tropsch process for the production of synthetic fuels in bubble slurry columns. To predict the hydrodynamics in large slurry bubble columns a multi-scale modeling approach can be used, which accounts for the large variation in time and length scales. In this paper, the smallest scale model has been developed using the Front Tracking model of Dijkhuizen et al. (2010b) and the Immersed Boundary model of Kriebitzsch (2011). In the Front Tracking model, each bubble is tracked separately. Furthermore, the Immersed Boundary method introduces the particle-fluid and the particle-particle (via a hard sphere model) interactions in the model. The resulting hybrid Front Tracking Immersed Boundary model is able to simulate dense three-phase flows and account for swarm effects in a fundamental manner. From our simulations we found that the relative drag coefficient of bubbles in three-phase flows seems to increase with increasing solids volume fraction. However, longer averaging periods are needed to derive a fully predictive correlation for the relative drag coefficient with respect to the solid volume fraction..

U2 - 10.1016/j.ces.2013.02.052

DO - 10.1016/j.ces.2013.02.052

M3 - Article

VL - 100

SP - 293

EP - 299

JO - Chemical Engineering Science

JF - Chemical Engineering Science

SN - 0009-2509

ER -