论文标题
前后不对称控制粘弹性对螺旋游泳的影响
Front-back asymmetry controls the impact of viscoelasticity on helical swimming
论文作者
论文摘要
我们使用牛顿和粘弹性（Boger）流体的无磁性刚性螺旋游泳者进行实验。通过改变游泳运动员及其螺旋尾巴的尺寸，我们表明粘弹性的影响很大程度上取决于游泳者的几何形状：它可能导致游泳速度的显着提高（最高五倍），相似的下降（也达到五倍），或者可能没有影响。对我们的数据的分析以及理论建模表明，粘弹性对螺旋力推进的影响受雪人样效应的控制，以前报道了哑铃游泳者，其中游泳者的前后背部不对称会导致一种非牛顿弹性力量，可以有利于或强烈的网球运动。
We conduct experiments with force-free magnetically-driven rigid helical swimmers in Newtonian and viscoelastic (Boger) fluids. By varying the sizes of the swimmer body and its helical tail, we show that the impact of viscoelasticity strongly depends on the swimmer geometry: it can lead to a significant increase of the swimming speed (up to a factor of five), a similar decrease (also up to a factor of five) or it can have approximately no impact. Analysis of our data along with theoretical modeling shows that the influence of viscoelasticity on helical propulsion is controlled by a snowman-like effect, previously reported for dumbbell swimmers, wherein the front-back asymmetry of the swimmer leads to a non-Newtonian elastic force that can either favor or hinder locomotion.
