Nanoparticle dispersion in porous media: Effects of array geometry and flow orientation
Nanoparticle dispersion in porous media: Effects of array geometry and flow orientation
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DOI：
10.1103/physreve.104.015102
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发表时间：
2021-07-06
影响因子：
2.4
通讯作者：
Conrad，Jacinta C.
中科院分区：
文献类型：
--
作者：
Mangal，Deepak;Palmer，Jeremy C.;Conrad，Jacinta C.
我们调查的阵列的几何形状和流动方向上的有限尺寸的颗粒在有序阵列使用斯托克斯动力学模拟运输的影响。我们发现，静态扩散是独立的阵列的几何形状的范围内的体积分数的纳米检查。流动下的纵向分散取决于入射流相对于阵列点阵矢量的方向。Taylor-Aris行为恢复流沿着的晶格方向，而非单调依赖的Péclet数的色散系数的流动方向略有扰动，从某些晶格矢量，由于方向锁定和空间速度变化之间的竞争。
We investigate the effects of array geometry and flow orientation on transport of finite-sized particles in ordered arrays using Stokesian dynamics simulations. We find that quiescent diffusion is independent of array geometry over the range of volume fraction of the nanoposts examined. Longitudinal dispersion under flow depends on the direction of incident flow relative to the array lattice vectors. Taylor-Aris behavior is recovered for flow along the lattice directions, whereas a nonmonotonic dependence of the dispersion coefficient on the Péclet number is obtained for flow orientations slightly perturbed from certain lattice vectors, owing to a competition between directional locking and spatial velocity variations.