Two spheres translating in tandem through a colloidal suspension.
Two spheres translating in tandem through a colloidal suspension.
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两个球体通过胶体悬浮液串联移动。
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
E. Furst
中科院分区：
文献类型：
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作者：
Indira Sriram;E. Furst
使用激光镊子，两个胶体颗粒平行于均匀流动的悬浮相似大小的浴粒在有效体积分数φ (eff)=0.41。用共聚焦显微镜对液浴悬浮液的局部变形进行了成像，同时测量了施加在前导和后导探针颗粒上的阻力作为探针分离和速度的函数。浴槽结构随探针的速度和分离而变化。在足够高的速度下，可以观察到探针之间的耗尽区域。两个探针受到相同的阻力，并且阻力随着探针的分离而增加。结果表明，探针与探针之间的水动力相互作用对微观结构和阻力产生了影响，与孤立探针相比，探针与探针直接碰撞产生的阻力减小。
Using laser tweezers, two colloidal particles are held parallel to a uniformly flowing suspension of similarly sized bath particles at an effective volume fraction ϕ(eff)=0.41. The local deformation in the bath suspension is imaged by confocal microscopy, and, concurrently, the drag forces exerted on both the leading and the trailing probe particles are measured as a function of probe separation and velocity. The bath structure changes in response to the velocity and separation of the probes. A depleted region between probes is observed at sufficiently high velocities. Both probes experience the same drag force and the drag force increases with probe separation. The results indicate that bath-probe and probe-probe hydrodynamic interactions contribute microstructure and drag force and that drag exerted by direct bath-probe collisions is reduced compared to an isolated probe.