As a source for third-generation biofuel, microalgae can assist island countries to overcome their energy crisis. In this study, a novel photobioreactor having three segments is designed and Synechococcus HS-9 growth in the photobioreactors with and without a baffle is compared. The aims of this study are to investigate how the baffle influences bubble size, distribution, and velocity, to explain the bubble coalescence phenomena, and verify the effect of the baffle on Synechococcus HS-9 growth. The results showed that bubble size distribution in the photobioreactors paralleled the increasing air flow rate. At a flow rate of 1.0 L/min, most bubbles had a diameter of 200–400 μm; however, at 2.5 L/min, the typical size was 1400–2000 μm. Bubble velocity was observed through imaging techniques. The intake air flow rate of 1 LPM has a mass transfer coefficient value of 0.00075 m/s for the photobioreactor without the baffle and 0.00089 m/s for the baffle-bearing photobioreactor. The Sauter mean diameters at three different heights (A, B and C section) in the photobioreactors were 675 μm, 1001 μm, and 1125 μm. Synechococcus HS-9 growth was 2.17 times higher in the baffle-bearing photobioreactor than that in the photobioreactor without the baffle.

作为第三代生物燃料的来源，微藻可以帮助岛国克服能源危机。在这项研究中，设计了一种具有三个部分的新型光生物反应器，并比较了有和没有挡板的光生物反应器中聚球藻HS-9 的生长情况。本研究的目的是研究挡板如何影响气泡大小、分布和速度，解释气泡聚结现象，并验证挡板对聚球藻的影响。HS-9 增长。结果表明，光生物反应器中的气泡尺寸分布与增加的空气流速平行。在 1.0 L/min 的流速下，大多数气泡的直径为 200-400 μm；然而，在 2.5 L/min 时，典型尺寸为 1400–2000 μm。通过成像技术观察气泡速度。对于没有挡板的光生物反应器，1 LPM 的进气流速的传质系数值为 0.00075 m/s，对于带挡板的光生物反应器，其传质系数值为 0.00089 m/s。光生物反应器中三个不同高度（A、B 和 C 部分）的 Sauter 平均直径为 675 μm、1001 μm 和 1125 μm。在带有挡板的光生物反应器中，聚球藻HS-9 的生长速度是没有挡板的光生物反应器中的 2.17 倍。