Anomalous hydrodynamic interaction in a quasi-two-dimensional suspension
Anomalous hydrodynamic interaction in a quasi-two-dimensional suspension
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DOI：
10.1103/physrevlett.92.258301
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发表时间：
2004-06-25
影响因子：
8.6
通讯作者：
Rice, SA
中科院分区：
文献类型：
--
作者：
Cui, BX;Diamant, H;Rice, SA
本文研究了悬浮在水中并被限制在两块平板之间的微米级颗粒的相关布朗运动。粒子之间的流体动力学相互作用表现出三个异常。(i)横向耦合是负的;即，当垂直于它们的连接线移动时，颗粒相互施加"反阻力"。(ii)相互作用随着颗粒间距离r为1/r（2）而衰减，比无限制悬浮液中的衰减快，但比单壁附近的衰减慢。(iii)在大的距离，对相互作用是独立的浓度范围内的实验精度。因此，封闭的悬浮液提供了一个不寻常的例子，远距离，但基本上是成对的，即使在高浓度的相关性。这些影响所示的单粒子运动引起的流的二维偶极形式。
We study the correlated Brownian motion of micron-sized particles suspended in water and confined between two plates. The hydrodynamic interaction between the particles exhibits three anomalies. (i) The transverse coupling is negative; i.e., particles exert "antidrag" on one another when moving perpendicular to their connecting line. (ii) The interaction decays with interparticle distance r as 1/r(2), faster than in unconfined suspensions but slower than near a single wall. (iii) At large distances, the pair interaction is independent of concentration within the experimental accuracy. The confined suspension thus provides an unusual example of long-range, yet essentially pairwise, correlations even at high concentration. These effects are shown to arise from the two-dimensional dipolar form of the flow induced by single-particle motion.