A single helical baffle (SHB), consisting of twisted turns, was developed to convert straight flow into spiral flow in a Chlorella PY-ZU1 open raceway pond (ORWP) bubbled with 15% CO₂. Microalgal solution flowing through the SHB alternative helical interspaces generated whirling flow both vertically and horizontally, which decreased mixing and increased mass transfer rates. The optimized SHB had a pitch length to total SHB length ratio of 0.13 and SHB diameter to ORWP single channel width ratio of 0.30, which decreased mixing times and increased mass transfer coefficients by 41.1% and 38.4% respectively. SHB moved Chlorella PY-ZU1 from the ORWP bottom to the top, increasing light exposure for photosynthesis. Cellular electron transfer rates and photochemical efficiency (φPSII) increased by 18%, chlorophyll a content increased by 16% and variable to maximum fluorescence ratio increased by 13%. The microalgal biomass of SHB ORWP was 23% higher than that of conventional ORWP.

开发了一个单螺旋折流板（SHB），该螺旋折流板由扭曲的螺旋线组成，可以在通入15％CO ₂的小球藻PY-ZU1开放水道池（ORWP）中将直流转换为螺旋流。流过SHB替代螺旋形空隙的微藻溶液在垂直和水平方向均产生涡流，从而减少了混合并提高了传质速率。优化后的SHB的节距长度与总SHB长度之比为0.13，SHB直径与ORWP单通道宽度之比为0.30，这将减少混合时间，并使传质系数分别增加41.1％和38.4％。SHB移动小球藻PY-ZU1从ORWP底部到顶部，以增加光合作用的曝光量。细胞电子传递速率和光化学效率（φPSII）增加了18％，叶绿素a含量增加了16％，可变最大荧光比增加了13％。SHB ORWP的微藻生物量比常规ORWP高23％。