4D imaging of sub-second dynamics in pore-scale processes using real time synchrotron x-ray tomography
4D imaging of sub-second dynamics in pore-scale processes using real time synchrotron x-ray tomography
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DOI：
10.5194/se-2016-40
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发表时间：
2016
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影响因子：
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通讯作者：
K. Dobson;S. Coban;S. McDonald;J. Walsh;R. Atwood;P. Withers
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文献类型：
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作者：
K. Dobson;S. Coban;S. McDonald;J. Walsh;R. Atwood;P. Withers
可变体积流动池已与最先进的超高速同步加速器X射线断层扫描成像集成。该组合允许在4D（3D +时间）中首次真实的（亚秒）捕获动态孔（微米）尺度流体输送过程。通过在高达20 Hz的频率下采集的3D数据体，我们进行了原位实验，以2.5至3.8 μm的体素（像素的3D等效物）分辨率捕获5-25 mm直径样品中的高频孔隙尺度动态。数据没有运动伪影，可以在相同的方向上进行空间配准或收集，使它们适合于动态流体分配路径和过程的详细定量分析。这里提出的方法是能够捕捉范围广泛的高频非平衡孔隙尺度的过程，包括润湿，稀释，混合和反应现象，而不牺牲显着的空间分辨率。除了20 Hz的快速流（连续采集）外，它还允许以较低频率间歇性采样更大规模和更长时间的实验运行（延时成像）;得益于快速图像采集速率，以防止高动态系统中的运动模糊。20这标志着高频孔隙尺度过程量化的重大技术突破：这些过程对于通过空间和时间异质孔隙网络开发和验证更准确的多尺度流动模型至关重要。
A variable volume flow cell has been integrated with state-of-the-art ultra-high speed synchrotron x-ray tomography imaging. The combination allows the first real time (sub-second) capture of dynamic pore (micron) scale fluid transport processes in 4D (3D + time). With 3D data volumes acquired at up to 20 Hz, we perform in situ experiments that capture high frequency pore-scale dynamics in 5-25 mm diameter samples with voxel (3D equivalent of a pixel) resolution of 2.5 to 3.8 μm. The data are free from motion artefacts, can be spatially registered or collected in the same orientation making them 15 suitable for detailed quantitative analysis of the dynamic fluid distribution pathways and processes. The methods presented here are capable of capturing a wide range of high frequency non equilibrium pore-scale processes including wetting, dilution, mixing and reaction phenomena, without sacrificing significant spatial resolution. As well as fast streaming (continuous acquisition) at 20 Hz, it also allows larger-scale and longer term experimental runs to be sampled intermittently at lower frequency (time-lapse imaging); benefiting from fast image acquisition rates to prevent motion blur in highly dynamic systems. 20 This marks a major technical breakthrough for quantification of high frequency pore scale processes: processes that are critical for developing and validating more accurate multiscale flow models through spatially and temporally heterogeneous pore networks.