微游泳池诱导载流子输运的机理
Mechanisms of carrier transport induced by a microswimmer bath
摘要：
最近，人们发现，一个楔形微粒（称为“载体”），只允许平移，但不旋转，表现出一个定向的平移运动沿楔形尖，如果它是暴露于浴的microswimmer。在这里，我们详细地解决microswimmer明确使用不同程度的相互对齐的相互作用模型来模拟这种效果。通过计算机模拟，我们研究了这些相互作用对V型载流子输运效率的影响。我们表明，运输机制本身强烈依赖于体现在建模的个人游泳运动员的动态对齐的程度。对于弱对齐，最佳的载流子传输发生在湍流的microswimmer状态，并引起载体内的漩涡耗尽。对于强对齐的相互作用，最佳的运输已经发生在稀释制度，并介导的载体尾流推动楔形粒子向前的游泳者的极地云。我们还表明，导致最大运输速度的载体的最佳形状取决于所使用的相互作用模型的种类。
英文摘要：
Recently, it was found that a wedgelike microparticle (referred to as "carrier") which is only allowed to translate but not to rotate exhibits a directed translational motion along the wedge cusp if it is exposed to a bath of microswimmers. Here we model this effect in detail by resolving the microswimmers explicitly using interaction models with different degrees of mutual alignment. Using computer simulations we study the impact of these interactions on the transport efficiency of V-shaped carrier. We show that the transport mechanisms itself strongly depends on the degree of alignment embodied in the modelling of the individual swimmer dynamics. For weak alignment, optimal carrier transport occurs in the turbulent microswimmer state and is induced by swirl depletion inside the carrier. For strong aligning interactions, optimal transport occurs already in the dilute regime and is mediated by a polar cloud of swimmers in the carrier wake pushing the wedge-particle forward. We also demonstrate that the optimal shape of the carrier leading to maximal transport speed depends on the kind of interaction model used.
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