Abstract
Fluorescent particle image velocimetry (FPIV) is used in conjunction with refractive-index-matching to measure flow velocities in the interstitial regions of a porous medium. Adaptations that allow the use of conventional PIV methodology in index-matched systems are discussed, and the results of flow field measurements in a porous test bed under saturated flow conditions are presented. Preliminary analysis of these data, in which the horizontal and vertical components of the interstitial velocity vectors were averaged over a specified region within the medium, are also presented and compared with the predictions obtained from the total volumetric flow rate. The macroscopically derived and FPIV measured values are found to be in close agreement. In general, our results demonstrate the utility of the FPIV technique to determine both the point velocity and the local volume-averaged velocity within porous media.
Published Version
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