Although vortex-induced vibration is widely observed, not only its characteristics but also its manipulation remains ambiguous. The effects of mixed-liquor rheology on vortex-induced vibration are investigated in a hollow-fiber MBR using particle image velocimetry (PIV) for observation and computational fluid dynamics (CFD) for modeling. PIV shows the vibration in the form of the Karman vortex with amplify similar diameter. Further, CFD shows a lower Strouhal number (St, 0.149) at the optimized MLSS 6305 mg·L^-1, resulting similar vibration frequencies 1.89±0.20 Hz in 78.7% tank volume. The lower St 0.151±0.002 therefore increases resonance probability. The resonance doubled the shear force without extra energy input. A full scale MBR’s permeability was used to test the assumption of optimizing shear force by vibration in rheology optimized mixed-liquor. The theoretically optimized MLSS 6305 mg·L^-1 (5615 mg·L^-1, practically) achieved the highest permeability. The accordance suggested that optimized MLSS doubled the shear force by resonance of vortex-induced vibration within proper mixed-liquor rheology. The MBR’s permeability is nearly doubled to 1.84 ± 0.70 L·m^-2·h^-1·kpa^-1 at the optimized MLSS, and sustained longer period (∼ 3 months).

尽管广泛观察到涡流引起的振动，但不仅其特性而且其操纵仍然模棱两可。在中空纤维MBR中，使用粒子图像测速仪（PIV）进行观测，并利用计算流体动力学（CFD）进行建模，研究了混合液流变学对涡流诱发的振动的影响。PIV以Karman涡旋的形式显示出具有类似直径的振动。此外，CFD在优化的MLSS 6305 mg·L ^-1处显示出较低的Strouhal数（St，0.149），在78.7％的储罐容积中产生了类似的振动频率1.89±0.20 Hz。较低的圣因此，0.151±0.002增加共振概率。共振使剪切力加倍，而无需额外的能量输入。在流变优化的混合液中，采用满量程MBR的渗透性来测试通过振动优化剪切力的假设。从理论上优化的MLSS 6305 mg·L ^-1（5615 mg·L ^-1，实际上）达到了最高的渗透率。该建议表明，优化的MLSS通过在适当的混合液流变性内通过涡流诱发的振动的共振使剪切力加倍。在优化的MLSS下，MBR的渗透率几乎翻了一番，达到1.84±0.70 L·m ^-2 ·h ^-1 ·kpa ^-1，并且持续时间更长（〜3个月）。