| Summary: | 碩士 === 國立臺灣大學 === 化學工程學研究所 === 103 === This article presents a series of calculation of the effective diffusivity from the detailed mass transfer modeling of mixed matrix membranes with non-spherical (tubular and layered) fillers. We construct the filler-and-matrix models mimicking the realistic mixed matrix membranes, and perform the mass transfer simulations. A number of mixed matrix membranes'' parameters, including filler to matrix volume ratio, aspect ratio of fillers, filler to membrane''s relative diffusivity, and filler''s orientation are considered in our simulations. Our results show that tubular fillers'' alignment is critical to the effective diffusivity. The aspect ratio of tubular fillers only shows marginal effect on the effective diffusivity. Our results also suggest that the increase of aspect ratio and the intrinsic diffusivity of tubular filler will cause the increase of the overall effective diffusivity. For layered fillers, the effective diffusivity is influenced by the isotropy of the layered fillers caused by the differences in the out-of-plane and in-plane diffusivity. Also, the binary species selectivity in separation of the mixed matrix membranes can be adjust by the difference of the anisotropic diffusivity of the species-filler construction. Finally, we compare our results with selected experimental results in the literature for validation the prediction of the effective diffusivity of mixed matrix membranes.
|
|---|
