Bulk rheology and microrheology of active fluids.
Bulk rheology and microrheology of active fluids.
复制标题
活性流体的本体流变学和微观流变学。
DOI：
10.1140/epje/i2012-12098-5
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Foffano G
中科院分区：
文献类型：
--
作者：
Foffano G
摘要我们模拟了宏观剪切实验中的活性向列相和微观流变学模拟，其中一个球形探针粒子被拖动通过一个活跃的流体进行比较。在这两种情况下，我们定义了一个有效粘度：在整体剪切模拟的情况下，这是剪切应力和剪切速率之间的比率，而在微观流变学的情况下，它涉及摩擦系数和粒度之间的比率。我们表明，这种有效粘度，而不是仅仅是一个属性的活性流体，是受影响的方式选择来测量它，并强烈依赖于细节，如锚定条件在探针表面和系统的大小和大小的探针粒子。图形摘要
AbstractWe simulate macroscopic shear experiments in active nematics and compare them with microrheology simulations where a spherical probe particle is dragged through an active fluid. In both cases we define an effective viscosity: in the case of bulk shear simulations this is the ratio between shear stress and shear rate, whereas in the microrheology case it involves the ratio between the friction coefficient and the particle size. We show that this effective viscosity, rather than being solely a property of the active fluid, is affected by the way chosen to measure it, and strongly depends on details such as the anchoring conditions at the probe surface and on both the system size and the size of the probe particle.Graphical abstract