An active particle in a complex fluid
An active particle in a complex fluid
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DOI：
10.1017/jfm.2017.353
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发表时间：
2017-07-25
影响因子：
3.7
通讯作者：
Elfring, Gwynn J.
中科院分区：
文献类型：
--
作者：
Datt, Charu;Natale, Giovanniantonio;Elfring, Gwynn J.
在这项工作中，我们研究非牛顿流体中具有规定表面速度的活性粒子。我们利用倒数定理来获得静止二阶流体中具有任意轴对称滑移速度的活性球形粒子的速度。然后，假设滑移速度固定，与牛顿流体相比，我们确定了扩散电泳 Janus 粒子的运动如何受到复杂流体流变学（即粘弹性和剪切稀化粘度）的影响。我们发现，与牛顿流体相比，Janus 粒子在粘弹性流体中可能会更快或更慢，但在剪切稀化流体中总是更慢。
In this work, we study active particles with prescribed surface velocities in non-Newtonian fluids. We employ the reciprocal theorem to obtain the velocity of an active spherical particle with an arbitrary axisymmetric slip velocity in an otherwise quiescent second-order fluid. We then determine how the motion of a diffusiophoretic Janus particle is affected by complex fluid rheology, namely viscoelasticity and shear-thinning viscosity, compared to a Newtonian fluid, assuming a fixed slip velocity. We find that a Janus particle may go faster or slower in a viscoelastic fluid, but is always slower in a shear-thinning fluid as compared to a Newtonian fluid.