Ilg P
Department of Materials, Polymer Physics, HCI H541, ETH Zürich, Zürich, Switzerland.
Eur Phys J E Soft Matter. 2008 May-Jun;26(1-2):169-76. doi: 10.1140/epje/i2007-10248-6. Epub 2008 Feb 20.
The influence of attractive depletion forces on the structure and dynamics of ferrofluids is studied by computer simulations. In the presence of a magnetic field, we find that sufficiently strong depletion forces lead to an assembly of particle chains into columnar structures with hexagonal ordering inside the columns. In a planar shear flow, this ordering is destroyed, leading to strong shear thinning behavior. A pronounced anisotropy of the shear viscosity is observed. The viscosity is found to be largest when the magnetic field is oriented in the gradient direction of the flow.
通过计算机模拟研究了吸引性耗散力对铁磁流体结构和动力学的影响。在磁场存在的情况下，我们发现足够强的耗散力会导致粒子链组装成柱状结构，柱内具有六边形排列。在平面剪切流中，这种排列被破坏，导致强烈的剪切变稀行为。观察到剪切粘度存在明显的各向异性。当磁场沿流动梯度方向取向时，粘度最大。
