Abstract

LAIN, S.. Dynamic three-dimensional simulation of gas-liquid flow in a cylindrical bubble column. Lat. Am. appl. res. [online]. 2009, vol.39, n.4, pp.317-326. ISSN 0327-0793.

In this paper the transient threedimensional flow developing in a cylindrical laboratory bubble column is addressed from a numerical point of view. The simulation scheme combines a Large Eddy Simulation (LES) for describing the liquid phase and a Lagragian approach for the gas phase (discrete bubbles) phase. The bubble equation of motion considers all the relevant forces, i.e., buoyancy, fluid stresses, drag, added mass and transverse lift. From the calculations, the transverse lift in combination with the drag is identified as the main mechanism allowing the bubbles to spread over the column cross-section. The liquid and gas velocity profiles obtained are compared with experimental data and k - e results. As a matter of fact, the dynamic structure of the liquid flow induced by the rising bubbles is well reproduced and also good quantitative results for all measured variables of both phases, gas and liquid, are obtained.

Keywords : Bubble Column; Numerical Simulation; Euler-Lagrange Approach; Turbulence.

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