Contribution of synchrotron X-ray holotomography to the understanding of liquid distribution in a medium during liquid aerosol filtration
Contribution of synchrotron X-ray holotomography to the understanding of liquid distribution in a medium during liquid aerosol filtration
复制标题
同步加速器 X 射线全息摄影术对了解液体气溶胶过滤过程中介质中液体分布的贡献
DOI：
10.1016/j.ces.2010.11.008
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发表时间：
2011
影响因子：
4.7
通讯作者：
Y. Gonthier
中科院分区：
文献类型：
--
作者：
A. Charvet;S. R. Roscoat;M. Peralba;J. Bloch;Y. Gonthier
纤维过滤器的三维结构决定了其在过滤过程中的行为，如所获得的压降、分级效率和过滤器的寿命。因此，描述过滤器内部结构(局部堆积密度)的合适参数是准确模拟过滤器性能的关键输入。在这项研究中，在欧洲同步辐射设备上进行了同步辐射X射线全息照相，以提供关于纤维滤光片的三维结构的信息。此外，这一非侵入性技术还被用来确定被癸二酸二乙基己酯液体气雾剂堵塞的过滤器中的液体分布。这些样品是在0.7μm的体素大小下成像的，这允许对过滤器内的不同相(液体、纤维和空隙)进行量化。结果完成了扫描电子显微镜的二维研究，突出了液体弯月面的形成，不仅在过滤器表面，而且在过滤器深度。同步辐射X射线全息照相的图像分析也突出了沿堵塞过滤器厚度的不均匀液体分布。
The three-dimensional structure of a fibrous filter determines its behaviour during filtration, such as the obtained pressure drop, the fractional efficiency and the filter lifetime. Therefore, suitable parameters describing the inner structure (the local packing density) are key inputs for modelling filter performance accurately. The synchrotron X-ray holotomography, carried out at the European Synchrotron Radiation Facility, was performed in this study to provide information on the three-dimensional structure of a fibrous filter. Moreover, this non-invasive technique was used to determine the liquid distribution in a filter clogged with a liquid aerosol of di-ethyl-hexyl-sebacate. These samples were imaged at a voxel size of 0.7μm, which allows the quantification of the different phases within the filter (liquid, fibres and void space). The results complete the two-dimensional studies obtained by scanning electron microscopic and highlight the formation of liquid menisci not only on the filter surface but also in the filter depth. Image analyses of synchrotron X-ray holotomography radiographs also highlight a heterogeneous liquid distribution along the thickness of the clogged filter.