Micro computed tomography images of capillary actions in smooth glass beads

The present work investigates the effect of both surface roughness and particle morphology on the retention behaviour of granular materials. To study this, X-ray micro-computed tomography tests were performed on two types of spherical glass beads (i.e. smooth and rough) and two different sands (i.e. natural and roughened). Each sample was subjected to either drainage or soaking paths consisting in a multiphase ‘static’ flow of potassium iodine (KI) brine (wetting phase) and dry air (non-wetting phase). Tomograms were taken at different saturation states ranging from fully brine saturated to air dry conditions.

本研究探究了表面粗糙度与颗粒形貌对颗粒材料持留特性的影响。为开展该研究，我们针对两类球形玻璃微珠（即光滑型与粗糙型）以及两种不同砂样（即天然砂与粗糙化砂）开展了X射线显微计算机断层扫描（X-ray micro-computed tomography）试验。每个试样均被置于两种试验路径中：排水路径与浸泡路径，两种路径均采用碘化钾（KI）盐水（润湿相）与干燥空气（非润湿相）构成的多相“静态”流体系。本研究在从完全盐水饱和至完全空气干燥的各类饱和度状态下采集了断层扫描图像。