摘要
以Fluent中的欧拉三相流模型为基础,采用改进的曳力模型对连续式三相气升式内环流生物反应器进行二维非稳态数值模拟,模拟反应器降流区时均液体循环速度和最大液体循环速度,不同曝气量和石英砂含量下的气含率及曝气量10.2 L/min、石英砂含量2 L时苯酚在反应器内的扩散过程.结果表明,模拟结果与实测值吻合较好.用该模型模拟固相密度为1200,1500,1 800,2 220 kg/m^3、固相颗粒粒径为0.3,0.6,0.9 mm条件下降流区的时均液体循环速度,较小的密度和粒径有助于提高液体循环速度.
Based on the Euler three-phase model in Fluent,the improved drag model was applied to the two-dimensional unsteady numerical simulation of continuous three-phase airlift inner-loop bioreactor.The improved model was applied to simulating the timeaveraged liquid velocity in the downcomer,the maximum liquid velocity,the gas holdups under different aeration rates and different volumes of sand and the diffusion process of phenol when the aeration rate was 10.2 L/min and the volume of sand was 2 L.The result showed the simulated values of liquid velocity,gas holdups and the diffusion process were consistent with the experiment results.Then the time-averaged liquid velocity in the downcomer was simulated with the improved model when the solid density was 1 200,1 500,1 800,2 220 kg/m^3,respectively,and particle sizes was 0.3,0.6,0.9 mm,respectively.The time-averaged liquid velocity increased with the solid density and the particle sizes decreasing.
出处
《过程工程学报》
CAS
CSCD
北大核心
2017年第5期944-951,共8页
The Chinese Journal of Process Engineering
基金
国家水体污染控制与治理科技重大专项(编号:2009ZX07423-004)
关键词
曳力模型
三相流
非稳态
数值模拟
drag model
three-phase flow
unsteady state
numerical simulation
