Effective viscosity of puller-like microswimmers: a renormalization approach.
Effective viscosity of puller-like microswimmers: a renormalization approach.
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类似拉拔器的微型游泳器的有效粘度：一种重正化方法。
DOI：
10.1098/rsif.2013.0720
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
Berlyand,LeonidV
中科院分区：
文献类型：
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作者：
Gluzman,Simon;Karpeev,DmitryA;Berlyand,LeonidV
有效粘度（EV）的悬浮液的puller-like microswimmer（pullers），例如Chlamydamonasalgae，是很难测量或模拟所有的游泳者浓度。虽然有充分的理由预期，电动汽车的牵引车是类似的被动悬架，分析测定的被动EV的所有浓度仍然不能令人满意。同时，细菌悬浮液的EV与这些系统中的集体运动密切相关，并且具有生物学意义。我们开发了一种方法，用于确定分析EV估计在所有浓度的悬浮液的拉以及被动悬架。所提出的方法是基于重整化群（RG）理论的思想，并构造EV公式的基础上，已知的渐近小浓度和临界点附近（即接近密集包装）。对于被动悬架，通过与已知理论结果的比较，验证了该方法。我们发现，该方法比早期的基于RG的技术表现得更好。对于拉拔器，通过将其与在衣原体悬浮液上进行的实验进行比较来进行验证。
Effective viscosity (EV) of suspensions of puller-like microswimmers (pullers), for exampleChlamydamonasalgae, is difficult to measure or simulate for all swimmer concentrations. Although there are good reasons to expect that the EV of pullers is similar to that of passive suspensions, analytical determination of the passive EV for all concentrations remains unsatisfactory. At the same time, the EV of bacterial suspensions is closely linked to collective motion in these systems and is biologically significant. We develop an approach for determining analytical EV estimates at all concentrations for suspensions of pullers as well as for passive suspensions. The proposed methods are based on the ideas of renormalization group (RG) theory and construct the EV formula based on the known asymptotics for small concentrations and near the critical point (i.e. approaching dense packing). For passive suspensions, the method is verified by comparison against known theoretical results. We find that the method performs much better than an earlier RG-based technique. For pullers, the validation is done by comparing them to experiments conducted onChlamydamonassuspensions.