Modeling Study of the Influence of Porosity on Membrane Absorption Process
Modeling Study of the Influence of Porosity on Membrane Absorption Process
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DOI：
10.1080/01496390701626644
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发表时间：
2007-11
影响因子：
2.8
通讯作者：
Geng-li Chen;Zhongqi Ren;Weidong Zhang;Jianjie Gao
中科院分区：
文献类型：
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作者：
Geng-li Chen;Zhongqi Ren;Weidong Zhang;Jianjie Gao
摘要在前锋模型的基础上建立了膜吸收过程的理论模型，分析了孔隙率对膜吸收过程的影响。得到了摄动解，并进行了非线性变换以提高解的精度。模拟了不同操作条件下膜表面附近液侧的溶质浓度分布。定性分析了影响溶质浓度分布扩散速度的因素。在快速传质体系中，反应前沿到达两个近端孔道中点的时间较长，这意味着溶质浓缩层缓慢地覆盖整个膜表面，存在传质死区，因此应考虑孔隙率的影响。在传质系统较慢的情况下，与整个实验时间相比，时间可以忽略不计，孔隙率的影响可以忽略不计。根据所建立的模型计算了吸收率，计算结果与文献结果吻合较好。
Abstract A theoretical model based on the advancing front model was developed to analyze the influence of porosity on membrane absorption process. Perturbation solutions were obtained and a nonlinear transformation was applied to increase the accuracy of the solutions. The concentration profile of the solute in the liquid side near the membrane surface was simulated for different operation conditions. The influencing factors on the diffusing rate of the solute concentration profile were analyzed qualitatively. In the case of the rapid mass transfer system, the time of reaction front to reach the midpoint of two proximate pores is relatively long, which means that the concentration layer of solute overcasts the whole surface of membrane slowly, there is a “dead” area for mass transfer, so the influence of porosity should be taken into account. In the case of slow mass transfer system, the time can be ignored compared with the overall experiment time, and the influence of porosity is negligible. The absorption rates were calculated based on the developed model and the calculated results agreed well with the literature results.