Shear stress computation in a millimeter thin flat panel photobioreactor: Numerical design validated by experiments,Biotechnology and Applied Biochemistry

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Shear stress computation in a millimeter thin flat panel photobioreactor: Numerical design validated by experiments
Biotechnology and Applied Biochemistry ( IF 3.2 ) Pub Date : 2020-02-03 , DOI: 10.1002/bab.1894
Wenbiao Jiang ₁ , Wendie Levasseur ₂ , Joel Casalinho ₁ , Thierry Martin ₁ , François Puel ₁ , Patrick Perré _{1,

2} , Victor Pozzobon ₂

Affiliation

Flat panels are the most spread type of photobioreactors for studying light effects on a microalgae culture. Their low thickness, usually between 1 and 3 cm, aims at ensuring light homogeneity across the culture. Yet because optical density has to remain very low, studies are still limited to low cell density cultures. To alleviate this problem, even thinner photobioreactors can be designed. Nevertheless, thin flat panel reactors are very prone to induce high shear stress. This work aimed at designing a new millimeter thin panel photobioreactor to study light effects on Chlorella and Scenedesmus genera. We proposed a numerical workflow that is capable of assessing the shear stress intensity in such a reactor. The numerical predictions were validated at three different levels: 2D preliminary simulations were able to reproduce bubble commonly known behaviors; close to the nozzle, the predictions were successfully confronted to shadowgraphy experimental reference; at the mini bioreactor scale, experimental and numerical mixing were found to be close. After these throughout validations, shear stress intensity in the photobioreactor was calculated over 1000 Lagrangian tracers. The experienced shear stress was agglomerated at the population level. From the computed shear stress, it was possible to choose the minimal reactor thickness that would not hinder cell growth.

中文翻译：

毫米薄平板光生物反应器中的剪应力计算：通过实验验证的数值设计

平板是研究生物微藻培养物光效应的光生物反应器中分布最广的一种。它们的厚度很薄，通常在1-3厘米之间，旨在确保整个培养物中的光均匀性。然而，由于光密度必须保持非常低，因此研究仍限于低细胞密度培养。为了减轻这个问题，甚至可以设计更薄的光生物反应器。然而，薄平板反应器非常容易引起高剪切应力。这项工作旨在设计一种新型的毫米薄板光生物反应器，以研究光对小球藻和Scendesmus的影响属。我们提出了一种数字工作流程，该工作流程能够评估这种反应堆中的剪切应力强度。数值预测在三个不同的水平上得到了验证：2D初步模拟能够重现泡沫通常已知的行为；靠近喷嘴，这些预测已成功地用于阴影摄影实验参考。在微型生物反应器规模上，发现实验和数值混合很接近。在完成所有这些验证之后，计算了1000多个拉格朗日示踪剂在光生物反应器中的剪切应力强度。所经历的剪应力在总体水平上聚集。从计算的剪切应力中，可以选择不会阻碍细胞生长的最小反应器厚度。

更新日期：2020-02-03

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