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This study investigates the spatiotemporal behaviour of laminar plumes in a porous medium, focusing on Darcy regime with \(Pe\gg \!\mathcal {O}(1)\) . The objective is to identify the plume morphology and analyze the dilution of injected fluid mimicking contaminant concentration. Laboratory experiments were conducted using dyed saltwater to visualize the flow. This was achieved through the dye attenuation technique, which involved establishing a relationship between dye concentration and light intensity through calibration experiments. With the help of this relationship and image processing in MATLAB, we found the interface between the injected fluid and the surrounding medium in our plume experiments. The parameters of interest, namely the length and volume, were then used to derive semi-empirical correlations, which exhibited power-law behaviour and showed a good agreement with the experimental values. These findings can contribute to understanding geological plumes, such as those resulting from \(CO_2\) injection in deep saline aquifers for carbon sequestration and the spread of contaminated fluid through real geological formations, particularly in cases of groundwater contamination.

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Experimental Investigation of the Evolution of Dense Plumes in Porous Media Using Dye Attenuation Technique

  • 会议论文

  • 发表日期：

    2025年

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  • Chetan Raturi,
  • Sibasish Panda,
  • Chunendra K. Sahu

摘要

This study investigates the spatiotemporal behaviour of laminar plumes in a porous medium, focusing on Darcy regime with \(Pe\gg \!\mathcal {O}(1)\) . The objective is to identify the plume morphology and analyze the dilution of injected fluid mimicking contaminant concentration. Laboratory experiments were conducted using dyed saltwater to visualize the flow. This was achieved through the dye attenuation technique, which involved establishing a relationship between dye concentration and light intensity through calibration experiments. With the help of this relationship and image processing in MATLAB, we found the interface between the injected fluid and the surrounding medium in our plume experiments. The parameters of interest, namely the length and volume, were then used to derive semi-empirical correlations, which exhibited power-law behaviour and showed a good agreement with the experimental values. These findings can contribute to understanding geological plumes, such as those resulting from \(CO_2\) injection in deep saline aquifers for carbon sequestration and the spread of contaminated fluid through real geological formations, particularly in cases of groundwater contamination.