다상유동 RANS법을 이용한 버블컬럼 수치해석

Numerical investigations of bubble column flows were performed to validate the predictive capabilities of the commercial CFD solver STAR-CCM+. An Eulerian-Eulerian approach was used for the simulation of the two-phase flow in a bubble column. The numerical method takes into account interactive forces between both phases: drag force, lift force, turbulent dispersion force and wall lubrication force near the wall surface. The constituent moments of bubble size distribution function are transported with individual phase velocities with breakup and coalescence models to account for size dependent bubble motion. In the numerical results, the dependances of turbulence and lift models on the solutions were investigated. Validation of the present simulation results against available experimental and numerical data was carried out with respect to bubble plume oscillation, liquid velocity and gas hold-up. Finally, a reasonable agreement between the simulation and experimental results was obtained.