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Numerical study of the flow through an annular gap with filtration by a rotating porous cylinder
Engineering Applications of Computational Fluid Mechanics ( IF 6.1 ) Pub Date : 2022-02-08 , DOI: 10.1080/19942060.2021.2024451
Ievgen Mochalin 1, 2 , Jiancheng Cai 1, 2 , E. Shiju 1, 2 , Volodymyr Brazhenko 1, 2 , Dongyun Wang 1, 2
Affiliation  

A numerical simulation approach is substantiated and verified for predicting the Taylor-Couette flow with an impermeable outer stationary cylinder and porous rotating inner one. An imposed throughflow is considered, supplied via one end of the annular gap and leaving the domain through another gap end (retentate) and from inside of the rotating cylinder (permeate). The flow is typical for dynamic filtration by rotating cylindrical filters. In contrast to known publications, the rotating porous cylinder is included into the computational domain and the liquid flow inside of it is fully resolved. The influence of the permeate-retentate ratio and permeability of the rotating inner cylinder onto the centrifugal stability boundary and supercritical flow details is discussed. It is found that filtration velocity becomes distributed not uniformly along the porous cylinder when its hydraulic resistance is less than a definite value. After some critical threshold, the flow structure drastically changes, and spiral vortices appears, which crosses the porous rotating cylinder back and forth several times, providing multiple flow recirculation through the porous cylinder. The results obtained create the basis for the development of dynamic rotational filters for various applications.



中文翻译:

旋转多孔圆筒过滤通过环形间隙的流动数值研究

数值模拟方法被证实和验证,用于预测具有不透水外固定圆柱体和多孔旋转内圆柱体的 Taylor-Couette 流动。考虑了施加的通流,通过环形间隙的一端供应并通过另一间隙端(滞留物)和从旋转圆柱体内部(渗透物)离开域。流动是通过旋转圆柱形过滤器进行动态过滤的典型流动。与已知出版物相比,旋转多孔圆柱体被包含在计算域中,并且其内部的液体流动被完全解析。讨论了渗透-滞留比和旋转内筒的渗透率对离心稳定边界和超临界流动细节的影响。发现当其水力阻力小于一定值时,过滤速度沿多孔圆筒分布不均匀。在某个临界阈值之后,流动结构发生剧烈变化,出现螺旋涡流,它来回穿过多孔旋转圆柱体,提供通过多孔圆柱体的多次流动再循环。获得的结果为开发用于各种应用的动态旋转滤波器奠定了基础。

更新日期:2022-02-08
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