Abstract: 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/l) and ratio of wave amplitude to wave length (A/l) on the mass transfer and mixing performance were systematically analyzed. The results showed that when L/l=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 (q) 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/l=12 and A/l=0.8, the mass transfer performance was the best and the value of kLa was increased by about 10% compared with that of bioreactor with flat baffles. As L/l=12 and A/l=0.4, the mixing performance of the reactor was the best and the value of Em was increased by 14.7% compared with that of bioreactor with flat baffles.

Key words: computational fluid dynamics, bioreactor, waved baffle panel, flow and mixing, mass transfer

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/l)和波幅/波长(A/l)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/l=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(q)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/l=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/l=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%.

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