Particle arrestance modeling within fibrous porous media
Particle arrestance modeling within fibrous porous media
复制标题
纤维多孔介质内的粒子阻滞建模
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
K. Vafai
中科院分区：
文献类型：
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作者：
James E. Giuliani;K. Vafai
在本研究中，在纤维介质中，当流动条件超越斯托克斯流动状态时，研究了单个纤维上的颗粒生长。采用求解粘性不可压缩Navier-Stokes方程的数值模型，消除了过去研究中用于描述纤维介质速度场的Stokes流动近似。光纤以交错阵列建模，以消除有关相邻光纤影响的假设。数值模型的结果与单个圆柱体和圆柱体阵列的极限理论结果进行了比较，粒子的生长是时间、纤维周围的角位置和流动雷诺数的函数。从所检测的条件范围来看，随着雷诺数的增加，颗粒聚集成更高更窄的枝晶，这增加了它们断裂成更大的枝晶的可能性，随后，大大降低了多孔介质的水力导电性。
In the present study particle growth on individual fibers within a fibrous medium is examined as flow conditions transition beyond the Stokes flow regime. Employing a numerical model that solves the viscous, incompressible Navier-Stokes equations, the Stokes flow approximation used in past research to describe the velocity field through the fibrous medium is eliminated. Fibers are modeled in a staggered array to eliminate assumptions regarding the effects of neighboring fibers. Results from the numerical model are compared to the limiting theoretical results obtained for individual cylinders and arrays of cylinders, Particle growth is presented as a function of time, angular position around the fiber, and flow Reynolds number. From the range of conditions examined, particles agglomerate into taller and narrower dendrites as Reynolds number is increased, which increases the probability that they will break off as larger agglomerations and, subsequently, substantially reduce the hydraulic conductivity of the porous medium.