Numerical simulation of small bubblebig bubbleliquid threephase flows
Zhang, D. and Deen, N.G. and Kuipers, J.A.M. (2006) Numerical simulation of small bubblebig bubbleliquid threephase flows. In: CHISA 17th international congress of chemical and process engineering, 2731 August 2006, Prague.

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Abstract:  Numerical simulations of the small bubblebig bubbleliquid three phase heterogeneous flow
in a square crosssectioned bubble column were carried out with the commercial CFD package CFX4.4 to explore the effect of superficial velocity and inlet dispersed phase fractions on the flow patterns. The approach of Krishna et al. (2000) was adopted in the EulerEuler framework to numerically simulate the gasliquid heterogeneous flow in bubble columns. On basis of an earlier study (Zhang et al. 2005), the extended multiphase k  ε turbulence model (Pfleger and Becker, 2001) was chosen to model the turbulent viscosity in the liquid phase and implicitly account for the bubbleinduced turbulence. The obtained results suggest that, first of all, the extended multiphase k  ε turbulence model of Pfleger and Becker (2001) is capable of capturing the dynamics of the heterogeneous flow. With increasing superficial velocity, the dynamics of the flow, as well as the total gas holdup increases. It is observed that with increasing inlet phase fraction of the big bubbles, the total gas holdup decreases while the dynamic nature of the flow increases, which indicates that the small bubble phase mainly determines the total gas holdup while the big bubble phase predominantly agitates the liquid. 
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