The impact of porous walls on the rheology of suspensions
The impact of porous walls on the rheology of suspensions
复制标题
多孔壁对悬浮液流变学的影响
DOI:
10.1016/j.ces.2020.116178
复制
发表时间:
2021
影响因子:
4.7
通讯作者:
Brandt, Luca
中科院分区:
文献类型:
--
作者:
Rosti, Marco E.;Mirbod, Parisa;Brandt, Luca
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× 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.
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