Energy flow between two hydrodynamically coupled particles kept at different effective temperatures
Energy flow between two hydrodynamically coupled particles kept at different effective temperatures
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DOI：
10.1209/0295-5075/107/60004
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发表时间：
2014-08
期刊：
影响因子：
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通讯作者：
Antoine B'erut;A. Petrosyan;S. Ciliberto
中科院分区：
文献类型：
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作者：
Antoine B'erut;A. Petrosyan;S. Ciliberto
利用两个光镊测量了水中两个流体动力学耦合的微米级布朗粒子之间的能量交换。通过随机强迫两个粒子中的一个的位置，系统被驱动出平衡。受迫粒子的行为是因为它具有比另一个珠高的“有效温度”。这种驱动修改了平衡方差和珠子位置的互相关函数：我们测量粒子之间的能量流和瞬时互相关，与两个粒子之间的有效温差成比例。提出了一种基于经典水动力耦合张量的相互作用模型。理论和实验结果吻合得很好。
We measure the energy exchanged between two hydrodynamically coupled micron-sized Brownian particles trapped in water by two optical tweezers. The system is driven out of equilibrium by random-forcing the position of one of the two particles. The forced particle behaves as it has an “effective temperature” higher than that of the other bead. This driving modifies the equilibrium variances and cross-correlation functions of the bead positions: we measure an energy flow between the particles and an instantaneous cross-correlation, proportional to the effective temperature difference between the two particles. A model of the interaction which is based on classical hydrodynamic coupling tensors is proposed. The theoretical and experimental results are in excellent agreement.