摘要
对带波纹隔板的平板式生物反应器,利用计算流体动力学进行流场模拟,验证模型可靠性后,系统分析波纹隔板高/波长(L/λ)和波幅/波长(A/λ)两个波纹隔板结构参数对反应器传质及流动混合特性的影响.结果表明,当L/λ=12时,传质及流动混合性能较好,液相体积传质系数(kLa)、平均湍动能(Em)、下降区停留时间占循环一周时间之比(θ)等表征传质及混合的参数值均较大,得到的液体流速在微藻生长的最佳流速附近.当A/λ=0.8时,反应器的传质性能最优,kLa比采用平直隔板时增加了约10%;当A/λ=0.4时,反应器的混合效果最佳,Em比采用平直隔板时增加14.7%.
The computational fluid dynamics was applied to simulate the flow field of a flat plate photobioreactor （PBR） with waved baffle panel. After the reliability of model was validated, the effects of two structural parameters of waved baffles, i.e. the ratio of waved baffles height to wave length （L/λ） and ratio of wave amplitude to wave length （A/λ） on the mass transfer and mixing performance were systematically analyzed. The results showed that when L/2=12, better mass transfer and mixing performance were obtained and those related parameters such as the liquid volumetric mass transfer coefficient （kLa）, ratio of cycle time of the downcomer to that of PBR （θ） and averaged turbulence kinetic energy （Em） were higher. Besides, the obtained liquid velocity was close to the optimum value being most favorable to microalgal growth. When L/A=12 and A/A=0.8, the mass transfer performance was the best and the value of kLa was increased by about 10% compared with that ofbioreactor with flat baffles. As L/λ=12 and .4/2=0.4, the mixing performance of the reactor was the best and the value of Era was increased by 14.7% compared with that ofbioreactor with fiat baffles.
出处
《过程工程学报》
CAS
CSCD
北大核心
2012年第5期748-753,共6页
The Chinese Journal of Process Engineering
关键词
计算流体动力学
生物反应器
波纹隔板
流动混合
传质
computational fluid dynamics
bioreactor
waved baffle panel
flow and mixing
mass transfer
