State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
Bioresour Technol. 2018 Aug;261:151-157. doi: 10.1016/j.biortech.2018.04.022. Epub 2018 Apr 9.
Double paddlewheels were proposed to generate cycle flow for increasing horizontal fluid velocity between dark and light zones in a flat plate photo-bioreactor, which strengthened the mass transfer and the mixing effect to improve microalgal growth with 15% CO. Numerical fluid dynamics were used to simulate the cycle flow field with double paddlewheels. The local flow field measured with particle image velocimetry fitted well with the numerical simulation results. The horizontal fluid velocity in the photo-bioreactor was markedly increased from 5.8 × 10 m/s to 0.45 m/s with the rotation of double paddlewheels, resulting in a decreased dark/light cycle period. Therefore, bubble formation time and diameter reduced by 24.4% and 27.4%, respectively. Meanwhile, solution mixing time reduced by 31.3% and mass transfer coefficient increased by 41.2%. The biomass yield of microalgae Nannochloropsis Oceanic increased by 127.1% with double paddlewheels under 15% CO condition.
提出双桨轮方案以产生循环流，在平板光生物反应器的暗区和亮区之间增加水平流体速度，从而加强传质和混合效果，以提高微藻在 15% CO 下的生长速度。采用数值流体动力学模拟双桨轮的循环流场。用粒子图像测速法测量的局部流场与数值模拟结果吻合良好。双桨轮的旋转使光生物反应器中的水平流体速度从 5.8×10-5m/s显著增加到 0.45m/s，从而缩短了暗/亮周期。因此，气泡的形成时间和直径分别减少了 24.4%和 27.4%。同时，溶液混合时间减少了 31.3%，传质系数增加了 41.2%。在 15% CO 条件下，双桨轮使海洋微拟球藻的生物量产量增加了 127.1%。
