The origin of high hydraulic resistance for filter cakes of deformable particles: cell-bed deformation or surface-layer effect?
The origin of high hydraulic resistance for filter cakes of deformable particles: cell-bed deformation or surface-layer effect?
复制标题
可变形颗粒滤饼高水力阻力的根源：细胞床变形还是表面层效应？
DOI：
10.1016/j.ces.2004.06.040
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发表时间：
2004
影响因子：
4.7
通讯作者：
P. Aimar
中科院分区：
文献类型：
--
作者：
M. Meireles;Catherine Molle;M. Clifton;P. Aimar
这项研究报告了一种对可变形细胞滤饼的水力阻力进行建模的数值方法。首先，提出了一个机械和渗透模型，该模型描述了酵母细胞床中固体的体积分数作为其所经历的压缩压力的函数。通过过滤实验和基于多速度平衡沉积高度技术的离心实验进一步研究了压力对酵母细胞床可压缩性的影响。当将后者的测量结果与压缩模型计算进行比较时，我们观察到基于离心实验的方法会遭受压缩床的快速松弛。关于过滤实验，通过将压缩模型与使用格子玻尔兹曼方法开发的水力电阻率公式相结合，计算了明确定义的细胞床的比电阻。我们进一步解释了观察到的细胞床水力阻力的实验值，假设与膜接触的第一层细胞部分阻塞了开放流动的膜区域。在这种情况下，被阻挡的面积似乎是正常细胞与细胞接触面积的恒定分数。
This study reports a numerical approach for modeling the hydraulic resistance of a filter cake of deformable cells. First, a mechanical and osmotic model that describes the volume fraction of solids in a bed of yeast cells as a function of the compressive pressure it experiences is presented. The effects of pressure on the compressibility of yeast cells beds were further investigated both by filtration experiments and by centrifugal experiments based on the multiple speed equilibrium sediment height technique. When comparing the latter measurements with compression model calculations, we observed that the method based on centrifugal experiments suffers from rapid relaxation of the compressed bed. Concerning the filtration experiments, specific resistance of well-defined bed of cells were calculated by a combination of the compression model with a formulation for hydraulic resistivity developed using the Lattice Boltzmann method. We further explain the experimental values observed for the hydraulic resistance of cell beds, assuming that the first layer of cells in contact with the membrane partially blocks the membrane area open to flow. In such a case, the blocked area seems to be a constant fraction of the normal cell–cell contact area.