摘要
在传统平板式光生物反应器中加入波纹形隔板,以其导流作用强化液体循环和气液传质,建立了新型带波纹隔板的平板式光生物反应器.利用计算流体动力学(CFD)模拟及实验考察了该反应器的流动与传质特性及其影响因素.结果表明,CFD模拟结果与实验测量值吻合良好,液体在上升区和下降区之间形成了良好的循环,随通气比增加,液相速度、平均气含率和溶氧体积传质系数均近似线性增加.单位体积能量输入与平均液相体积传质系数之间有良好的线性关系.综合各相关参数得到优化结构为:下降区/上升区截面积为1.62,隔板顶端到液面的距离为260mm,隔板底端到反应器底部的距离为20mm.
A novel panel photobioreactor with two wavy baffles for improving flow and mixing is presented.Both experiments and computational fluids dynamics （CFD） simulation were conducted to detect the hydrodynamic characteristics of the panel including flow,averaged gas holdup,volumetric mass transfer coefficients and the ratio of cycle time of liquid between riser and downcomer.It was found that the CFD simulation agreed well with experimental results.The wavy baffles used resulted in a good circulation flow between riser and downcomer.With the increase of aeration rate,liquid flow velocity,averaged gas holdup and volumetric mass transfer coefficients increased near linearly.There was a good linear relationship between averaged volumetric mass transfer coefficient and volumetric power input.Considering related factors,an optimized structure of the panel with wavy baffles was obtained as the ratio of cross-section area of the downcomer and the riser 1.62,clearance from the upper edge of the baffles to the water lever 260 mm,and clearance from the lower edge of the baffles to the bottom of the reactor 20 mm.
出处
《过程工程学报》
CAS
CSCD
北大核心
2010年第5期849-855,共7页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20976088)
关键词
波纹隔板
流动混合
气含率
溶氧体积传质系数
CFD
wave-baffled panel
flow and mixing
gas holdup
volumetric mass transfer coefficient
CFD
