活性樟脑颗粒诱导的混合与非混合
Mixing and unmixing induced by active camphor particles
摘要：
在这项实验研究中，我们报告的混合性能的界面胶体浮子（玻璃泡）的化学和流体动力学电流所产生的自推进樟脑磁盘游泳在空气-水界面。尽管玻璃泡分布达到统计学上的稳定状态，但这些漂浮物总是保持仅部分混合。这种中间状态的结果之间的竞争（i）混合诱导的无序运动的许多樟脑游泳者和（ii）unmixed促进的化学云连接到每个单独的自推进盘。混合/不混合的特点是全球使用的浓度和光谱的标准偏差，但也更局部的平均浓度场周围的游泳者。除了分层过程，该系统开发了一个“类似的”浓度谱，与大尺度区域，惯性制度和Batchelor区域。我们发现，不混合是由于周围的樟脑游泳者的马兰戈尼流，并与可压缩效应。
英文摘要：
In this experimental study, we report on the mixing properties of interfacial colloidal floaters (glass bubbles) by chemical and hydrodynamical currents generated by self-propelled camphor disks swimming at the air-water interface. Despite reaching a statistically stationary state for the glass bubbles distribution, those floaters always remain only partially mixed. This intermediate state results from a competition between (i) the mixing induced by the disordered motion of many camphor swimmers and (ii) the unmixing promoted by the chemical cloud attached to each individual self-propelled disk. Mixing/unmixing is characterized globally using the standard deviation of concentration and spectra, but also more locally by averaging the concentration field around a swimmer. Besides the demixing process, the system develops a "turbulent-like" concentration spectra, with a large-scale region, an inertial regime and a Batchelor region. We show that unmixing is due to the Marangoni flow around the camphor swimmers, and is associated to compressible effects.
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