The possibility of the blood filtration and photo-bioreactor with the Taylor chaotic mixing vortex.

固液多相流的过滤在宽高比(Γ)为0.5~1.0的范围内，在垂直边界附近存在的边界层(Ekman边界层)的影响下，出现了不同的涡模。特别是在Γ=0.6时，存在一对存在于垂直线上的涡旋相互自激振荡的区域。当雷诺数进一步增加通过自激振荡区时，这对涡旋停止振动，形成另一对涡旋，它们水平地排成一条线。这种模式被称为双涡模式，它是稳定的，但存在于非常有限的雷诺区。在Γ=3的过滤实验中，采用平均直径约80μm、比重为1.2时的尼龙颗粒进行过滤实验。在实验中，压力降为m…内筒的旋转速度(雷诺数)越高，越容易产生较小的雷诺数。当转速为0时(Re=0)，滤清器上的大部分颗粒在7分钟内积累，测试段变得透明。由于在工程实验室中很难直接处理血细胞，所以选用了与之相似的植物光合作用微生物(小球藻和螺旋藻)，并考察了Γ=1时泰勒涡对培养的流体力学效应。对于实际尺寸，分别选择了内筒直径为28 mm和外筒直径为75 mm。转速分别为150rpm和250rpm，内外缸半径差为25 mm。在光照强度和培养条件相同的情况下，培养时间为10天左右，在250rpm的较高转速下，没有观察到底板上的微生物沉淀，而在较低的转速下培养3天后，观察到了微生物的沉降量。即使在较高的转速下，微生物的细胞也没有被破坏，在两种转速下都保持了良好的活性状态。尤其是在底部有沉淀物的情况下，小球藻的比生长速率更高，从这些结果来看，小球藻微生物似乎更喜欢较温和的分享流条件，而不是较大转速的高分享流条件。较少

Filtration for solid-liquid multiphase flowIn the aspect ratio (Γ) from 0.5 to 1.0, various vortex modes have occurred in response to the influence of the boundary layer (Ekman boundary layer) which exists near the vertical boundary ends. Especially at Γ=0.6, there is a domain where a pair of vortex which exists in the vertical line make self-excited oscillation each other. When the Reynolds number increases further passing over the region of the self-excited oscillation, this pair of vortex stops vibrating and form the other pair of vortex, which stands in a line horizontally. This mode is called Twin vortex mode, which is stable but exists in the very limited Reynolds region. Further increase of Reynolds number after the region of the stable Twin vortex mode, it begins to oscillate again but in faster periods.In the filtration experiment of Γ=3, the nylon particle, of which mean diameter is about 80μm and the specific gravity of 1.2, is used. In the experiment, the pressure drop is m … More easured with a pretty lower value as the rotation speed (Reynolds number) of the inner cylinder is increased. When the rotation speed is 0 (Re=0), most particle is accumulated on the filter in 7 minutes, and the test section becomes near transparently. From these results, the rotation of inner cylinder is much effective on reducing the pressure drop through the filtration process.Cultivation of microorganism with Taylor vortex flowSince it is difficult for treating a blood cell directly in the engineering laboratory, the similar vegetable photosynthesis microorganisms (chlorella and Spirulina) are used, and the fluid dynamic effect to cultivation by the Taylor vortex is investigated when Γ=1. As for the actual size, the diameter of the inner cylinder is 28mm, and the one of the outer 75mm, are selected respectively. The rotational speed is 150rpm and 250rpm, and the radius difference between the inner and outer cylinders is 25mm. The intensity of radiation and the cultivation conditions are same, and the cultivation time is about ten days.In the higher rotational speed of 250rpm, sedimentation of the microorganism on the bottom plate is not observed, whereas the amount of sedimentation is seen in the lower rotational speed after the 3-day's cultivation. Even in the higher rotational speed, the cell of microorganism has not been destroyed, and the well-activated state is kept in the both rotational speeds. Especially a higher specific growth rate of the Chlorella is observed in the case of cultivation with the sedimentation on the bottom.From these results, Chlorella microorganism seems to prefer the milder share flow condition to the high share flow with the larger rotational speed. Less