A spectrum of environmental, industrial, and biomedical processes depends on solute plume spreading in laminar flows within porous media. The literature includes a number of approaches to model solute movement in this context, but fewer techniques are reported to measure it experimentally. To address this gap, this study describes novel experimental methods that permit measurement of solute plume spreading at the Darcy scale using laser-induced fluorescence in a 50 cm × 50 cm × 4 cm quasi-two-dimensional apparatus filled with refractive index-matched porous media. Fluorescence is provided by Rhodamine dye; refractive index matching is provided by borosilicate glass in glycerin. The depth-averaged porosity distribution of the porous media is determined using a novel optical method, whose results are used to investigate solute transport in two spatiotemporally varying flow fields, (1) a push–pull pumping sequence and (2) a sequence to induce stretching and folding of the solute plume. Quantitative analysis of replicate experiments reveals an extraordinary degree of reproducibility based on spatial moments, reactor ratio, and correlation coefficient.

环境，工业和生物医学过程的范围取决于溶质羽流在多孔介质内的层流中扩散。在这种情况下，文献包括许多模拟溶质运动的方法，但据报道，很少有实验性地测量它的技术。为了解决这个空白，本研究描述了新颖的实验方法，该方法可以在充满折射率匹配的多孔的50 cm×50 cm×4 cm准二维仪器中，使用激光诱导的荧光，测量达西规模的溶质羽流扩散。媒体。罗丹明染料提供荧光；甘油中的硼硅酸盐玻璃可提供折射率匹配。使用新型光学方法确定多孔介质的深度平均孔隙率分布，其结果用于研究溶质在两个时空变化的流场中的运移，（1）推挽泵送序列和（2）诱导溶质羽流伸展和折叠的序列。重复实验的定量分析显示，基于空间矩，反应堆比率和相关系数，可重复性极高。