论文标题
多孔墙对悬浮液流变的影响
The impact of porous walls on the rheology of suspensions
论文作者
论文摘要
我们研究各向同性多孔壁对载有球形和刚性颗粒的平面cOUTET的影响。我们进行了一项参数研究，其数量分数在$ 0 $至$ 30 \％$之间，孔隙率在$ 0.3 $和$ 0.9 $之间以及在$ 0 $ 0 $ 0 $ 0.9 \ times 10^{ - 3} $之间的非二维渗透性之间，我们发现多孔的墙壁会逐渐降低有效的允许性的悬挂式降低。这种行为是通过壁阻挡效应的弱化和在多孔介质界面处的滑动速度的出现来解释的，从而降低了通道中的剪切速率。因此，粒子旋转和两个阶段中的速度波动受到抑制，从而减少了粒子相互作用和粒子应力。根据我们的数值证据，我们为悬浮粘度提供了一组封闭的方程，可用于在存在多孔壁的情况下估算悬架流变学。
We study the effect of isotropic porous walls on a plane Couette flow laden with spherical and rigid particles. We perform a parametric study varying the volume fraction between $0$ and $30\%$, the porosity between $0.3$ and $0.9$ and the non-dimensional permeability between $0$ and $7.9 \times 10^{-3}$ We find that the porous walls induce a progressive decrease in the suspension effective viscosity as the wall permeability increases. This behavior is explained by the weakening of the wall-blocking effect and by the appearance of a slip velocity at the interface of the porous medium, which reduces the shear rate in the channel. Therefore, particle rotation and the consequent velocity fluctuations in the two phases are dampened, leading to reduced particle interactions and particle stresses. Based on our numerical evidence, we provide a closed set of equations for the suspension viscosity, which can be used to estimate the suspension rheology in the presence of porous walls.
