Abstract Based on the bionic fractal theory, a fractal tree-like photobioreactor (PBR) with high surface area to volume ratio is designed on the basis of bifurcation tree algorithm and manufactured via 3D printing technology. Numerical simulation and experimental results show that the fractal structure has a good flow performance and can lead to secondary flow, which is beneficial to enhance the turbulence and produce smaller bubble sizes. Chlorella culture in the fractal tree-like PBR has a higher Fv/Fm (Chlorophyll fluorescence parameter), close to 0.767, and higher efficiency of photosynthetic growth as well as CO2 capture, compared with multitubular PBR and conventional acrylic column reactors. Therefore, the fractal tree-like PBR can improve the efficiency of light energy utilization and bioreaction. Combined with 3D printing technology, fractal PBR blazes a new trail for process intensification on the microalgae cultivation.

中文翻译：

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大自然通过 3D 打印启发了分形树状光生物反应器，用于微藻捕获二氧化碳

摘要 基于仿生分形理论，基于分叉树算法设计了一种具有高表面积体积比的分形树状光生物反应器（PBR），并通过3D打印技术制造。数值模拟和实验结果表明，分形结构具有良好的流动性能，可产生二次流动，有利于增强湍流并产生较小的气泡尺寸。与多管 PBR 和传统的丙烯酸柱反应器相比，分形树状 PBR 中的小球藻培养具有更高的 Fv/Fm（叶绿素荧光参数），接近 0.767，以及更高的光合生长效率和 CO2 捕获效率。因此，分形树状PBR可以提高光能利用和生物反应的效率。结合3D打印技术，