Analysis of microstructure-effective diffusivity relationships for the interparticle pore space in physically reconstructed packed beds.
Analysis of microstructure-effective diffusivity relationships for the interparticle pore space in physically reconstructed packed beds.
复制标题
物理重建填充床中颗粒间孔隙空间的微观结构-有效扩散率关系分析
DOI:
10.1016/j.chroma.2018.11.003
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
U. Tallarek
中科院分区:
文献类型:
--
作者:
D. Hlushkou;U. Tallarek
We evaluate the effective diffusion coefficient in the interparticle pore space of eight physically reconstructed chromatographic packings of fully porous and core-shell particles, employing an analytical formula that involves the three-point microstructural parameter calculated from two-point and three-point correlation functions through an approach based on sampling templates. Diffusivities calculated by the approximate analytical formula are close to those obtained from pore-scale simulations in the reconstructions using a random-walk particle-tracking technique. Diffusivities are affected, apart from the interparticle porosity, by the actual bed microstructure and packing defects like particle oligomers, spalled shells, larger voids, and debris. Importantly, the data for the microstructural parameter and effective diffusion coefficient over the porosity range spanned by the individual packings (0.363–0.444) reveals non-monotonic behavior. Our analysis demonstrates that the three-point microstructural parameter reflects this morphological specificity of the packings and, as a result, Eq. (3) provides accurate estimates of the effective diffusion coefficients. The presented numerical approach can therefore be applied to evaluate diffusivities in packed beds with all their salient features just from the geometrical information embodied in the bed porosity and the three-point microstructural parameter.
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DOI:
10.1016/j.chroma.2006.05.066
发表时间:
2006-09
期刊:
Journal of chromatography. A
影响因子:
--
作者:
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通讯作者:
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影响因子:
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DOI:
10.1016/j.chroma.2012.10.027
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期刊:
Journal of chromatography. A
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通讯作者:
U. Tallarek
DOI:
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发表时间:
2012-05-11
期刊:
Journal of chromatography. A
影响因子:
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作者:
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通讯作者:
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影响因子:
3.2
作者:
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