A fast pink‐beam X‐ray microtomography methodology was developed at the GSECARS 13‐BMD beamline at the Advanced Photon Source to study multiphase flow in porous media. The white beam X‐ray distribution of the Advanced Photon Source is modified using a 1‐mm copper filter and the beam is reflected off a platinum mirror angled at 1.5 mrad, resulting in a pink beam with X‐ray intensities predominately in the range of 40–60 keV. Bubble formation in the wetting phase and wettability alteration of the solid phase from x‐ray exposure can be a problem with high flux and high energy beams, but the suggested pink‐beam configuration mitigates these effects. With a 14‐second acquisition time for capturing a complete dataset, the evolving fluid‐fronts of nonequilibrium three‐dimensional multiphase flow can be studied in real‐time and the images contain adequate image contrast and quality to measure important multiphase quantities such as contact angles and interfacial areas.

中文翻译：

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优化粉红色光束快速 X 射线显微断层扫描，用于 3D 多孔介质中的多相流

在高级光子源的 GSECARS 13-BMD 光束线上开发了一种快速粉红色光束 X 射线显微断层扫描方法，以研究多孔介质中的多相流。高级光子源的白色光束 X 射线分布使用 1 毫米铜过滤器进行修改，光束从角度为 1.5 毫拉德的铂镜反射，产生粉红色光束，其 X 射线强度主要在40–60 keV。润湿相中的气泡形成和 X 射线曝光引起的固相润湿性改变可能是高通量和高能光束的问题，但建议的粉红色光束配置减轻了这些影响。捕获完整数据集的采集时间为 14 秒，