Installation of baffles in bioreactor is a promising method to improve the gas–liquid mass transfer. This work aims to understand the effect of arc baffle (‘n’ and ‘u’ shape) on gas-liquid mass transfer in flat-plate bubble column. Based on the numerical approach, the effects of three parameters of arc baffles on the CO₂ gas–liquid mass transfer were studied, i.e., the projection length of baffle (L = 40, 60, 80 mm), the curvature radius of baffle (R = 50, 70, 90 mm and horizontal baffle means R = ∞ mm) and the bottom clearance (H = 50, 100, 150, 200, 250, 300 mm). The mass transfer model was validated, the experimental and numerical results are in good agreement at gas flow rate of 1 to 3 L min⁻¹. The results indicated that the overall volumetric mass transfer coefficient (K_La) for the ‘n’ and ‘u’ shape baffles both increased with the increasing L and H. For the ‘u’ shape baffle, the effect of R on K_La is low. Whereas, for the ‘n’ shape baffle, the K_La increased with the decreasing R. In addition, the results showed that the K_La of flat-plate bubble column with the ‘n’ shape baffle (L = 80 mm, R = 50 mm) can be increased by 44.5–170% compared with that with the horizontal baffle.

在生物反应器中安装折流板是改善气液传质的一种有前途的方法。这项工作旨在了解弧折流板（“ n”形和“ u”形）对平板鼓泡塔内气液传质的影响。基于数值方法，研究了弧形挡板的三个参数对CO ₂气液传质的影响，即挡板的投影长度（L  = 40、60、80 mm），挡板的曲率半径（R  = 50、70、90 mm，水平挡板表示R  =∞mm）和底部间隙（H  = 50、100、150、200、250、300 mm）。验证了传质模型，气体流速为1至3 L min时的实验和数值结果吻合良好^-1。结果表明，“ n”形和“ u”形挡板的整体体积传质系数（K _L a）都随着L和H的增加而增加。对于“ u”形挡板，R对K _L a的影响很小。而对于“ n”形挡板，K _L a随着R的减小而增加。此外，结果表明，平板式气泡塔的K _L a为“ n”形挡板（L  = 80 mm，R = 50 mm）与水平挡板相比可以增加44.5–170％。