Dipartimento di Ingegneria Civile Edile e Ambientale, Sapienza Università di Roma, via Eudossiana 18, 00184 Roma, Italy.
Dipartimento di Ingegneria Chimica Materiali Ambiente, Sapienza Università di Roma, via Eudossiana 18, 00184 Roma, Italy.
Water Res. 2014 Apr 1;52:29-39. doi: 10.1016/j.watres.2013.12.033. Epub 2014 Jan 3.
The present work deals with the experimental fluid mechanics analysis of a wavy-bottomed cascade photobioreactor, to characterize the extent and period of recirculatory and straight-flowing streams establishing therein as a function of reactor inclination and liquid flow rate. The substream characterization via Feature Tracking (FT) showed that a local recirculation zone establishes in each vane only at inclinations ≤6° and that its location changes from the lower (≤3°) to the upper part of each vane (6°). A straight-flowing stream flows opposite (above or below) the local recirculation stream. The recirculation time ranges from 0.86 s to 0.23 s, corresponding, respectively, to the minimum flow rate at the minimum inclination and to the maximum flow rate at the maximum inclination where recirculation was observed. The increase of photosynthetic activity, resulting from the entailed "flash effect", was estimated to range between 102 and 113% with respect to equivalent tubular and bubble column photobioreactors.
本工作涉及波浪形底叶轮机实验流体力学分析，以描述在不同反应器倾斜角度和液体流速下其中循环流和直流流的范围和周期。通过特征跟踪（FT）对亚流进行的表征表明，只有在倾斜角度≤6°时，每个叶片才会形成局部回流区，而且其位置从叶片下部（≤3°）变化到叶片上部（6°）。一股直流流与局部回流流相反（上方或下方）流动。回流时间范围为 0.86 s 至 0.23 s，分别对应于最小倾斜角度下的最小流速和观察到回流的最大流速。与等效的管状和气泡柱光生物反应器相比，“闪光效应”引起的光合作用活性增加估计在 102%至 113%之间。
