论文标题
克服潜在的障碍：在粒子传输中针对热波动的流体动力记忆对冲
Surmounting potential barriers: hydrodynamic memory hedges against thermal fluctuations in particle transport
论文作者
论文摘要
最近，捕获的粒子实验探测了布朗运动的瞬时速度，表明在早期，流体动力史作用力主导了stokes抑制作用。在这些实验中，Basset-Boussinesq-Oseen（BBO）方程很好地描述了非均匀的颗粒运动，该方程捕获了低雷诺数下的不稳定贝塞史力量。在这些结果的基础上，我们早些时候表明，在低温下，BBO颗粒可以利用流体惯性，以克服潜在的屏障（通常以倾斜垫板建模），而其langevin反零件则无法。在这里，我们在有限温度下探索BBO颗粒的行为。值得注意的是，我们发现，在中等温度下，可以将注入足够高屏障的颠簸电势的颗粒运输，而在该温度窗口的上方和下方可能有可能在中间的温度下进行淬火。 Langevin和BBO动力学都存在这种效果，尽管这些效果发生在截然不同的温度范围内。此外，即使在困难的中等温度状态下，流体动力记忆也通过维持初始颗粒动量来减轻这些影响。
Recently, trapped-particle experiments have probed the instantaneous velocity of Brownian motion revealing that, at early times, hydrodynamic history forces dominate Stokes damping. In these experiments, nonuniform particle motion is well described by the Basset-Boussinesq-Oseen (BBO) equation, which captures the unsteady Basset history force at low Reynolds number. Building off of these results, earlier we showed that, at low temperature, BBO particles could exploit fluid inertia in order to overcome potential barriers (generically modeled as a tilted washboard) while its Langevin counter-part could not. Here, we explore the behavior of BBO particles at finite temperature. Remarkably, we find that the transport of particles injected into a bumpy potential with sufficiently high barriers can be completely quenched at intermediate temperatures, whereas itinerancy may be possible above and below that temperature window. This effect is present for both Langevin and BBO dynamics, though these occur over drastically different temperature ranges. Furthermore, hydrodynamic memory mitigates these effects by sustaining initial particle momentum, even in the difficult intermediate temperature regime.
