Numerical modelling the influence of gas distributors on gas-liquid flow and mixing in a bubble column
Numerical simulations of gas-liquid flow in a cylindrical bubble column of 400mm with two-fluid approach and MUSIG model were conducted at high superficial gas velocity Ug=0.10m/s for eight gas distributors to investigate the influence of sparger designs on hydrodynamic, gas hold-up, mixing, turbulence and mixing time. The simulation results showed that the effect of sparger designs on liquid velocity and local gas holdup are significant in the sparger region. The comprehensive comparison of gas-liquid interfacial area and mixing time shows that the none of the considered spargers could not only produce the highest interfacial area but also yields the shortest mixing time. The modelling results also suggest that the more gas pipes are beneficial to increase the gas hold-up but harmful to reduce bubble size due to decreasing of turbulent kinetic dissipation,the asymmetrical structure and smaller circle diameter of gas pipes are profitable to enhance liquid mixing.
Bubble column CFD gas distributors mixing bubble size
LI Guang YANG Xiaogang DAI Gance
State Key Laboratory of Chemical Reactors, East China University of Science and Technology,Shanghai ASC Technology and Computer Science, North East Wales Institute of Higher Education,Wrexham, LL112AW
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）