优化的微藻细胞、二氧化碳气泡和培养液组成的流场中光穿透的三维数值模拟。
Three-dimensional numerical simulation of light penetration in an optimized flow field composed of microalgae cells, carbon dioxide bubbles and culture medium.
机构信息
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
出版信息
Bioresour Technol. 2019 Nov;292:121979. doi: 10.1016/j.biortech.2019.121979. Epub 2019 Aug 9.
In order to evaluate light penetration and its influence on microalgae growth in a raceway pond with alternatively permutated conic baffles (RWP-APCB), 3D numerical simulation of light penetration was performed using computational fluid dynamics in an optimized flow field composed of microalgae cells, CO bubbles and culture medium. Results showed that light intensity in the culture medium attenuated faster in accordance with solution depth, with increased microalgae cell concentration, increased bubble volume fraction and decreased CO bubble diameter. Light zone fraction (i.e. ratio of light zone length to solution depth) increased with promoted incident irradiation. It was found that around 75% of microalgae cells were distributed in light zone and non-photochemical quenching coefficient of microalgae decreased by 32% in RWP-APCB. This resulted in a 16% increase of the Chlorella pyrenoidosa biomass growth rate, to 0.36 g/L/d.
为了评估在具有交替排列的锥形挡板的跑道池中（RWP-APCB）的光穿透及其对微藻生长的影响，使用计算流体动力学在由微藻细胞、CO 气泡和培养基组成的优化流场中对光穿透进行了 3D 数值模拟。结果表明，随着溶液深度的增加，微藻细胞浓度的增加，气泡体积分数的增加和 CO 气泡直径的减小，培养基中的光强衰减得更快。光区分数（即光区长度与溶液深度之比）随着入射光的增加而增加。结果发现，约 75%的微藻细胞分布在光区中，微藻的非光化学猝灭系数降低了 32%。这使得小球藻的生物量增长率提高了 16%，达到 0.36 g/L/d。
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