J024052 模型実験とストークス近似理論による微生物の螺旋鞭毛運動の解明 : 推進力と推進効率の評価による最適螺旋形状の検討([J02405]バイオにおける流れと熱・物質移動(5))

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Microbe can move smoothly in water environment with high efficiency, which could offer new ideas for future micro machines. In this study, we investigated the spiral moving behavior of flagellum by using Stoke's theory and experimental models. We simulated euglena's fluid environment of Re number of 10-4. The optimal spiral shapes in terms of propulsive efficiency and the comparison with Stoke's theory were studied. We found that the propulsive force became bigger, as the spiral diameter increased. On the other hand, the propulsive efficiency was found to be highest when the spiral diameter was 15mm or 20mm. The reason was that the torque became bigger with larger spiral diameter, and that the propulsive force became smaller with smaller spiral diameter. Our mathematical equations based on Stoke's theory agreed accurately with the experimental results. Thus, the equations can be used for other predictions.
2011-09-11