Implications of surfactant-induced flow for miscible-displacement estimation of air-water interfacial areas in unsaturated porous media.

@article{CostanzaRobinson2012ImplicationsOS,
  title={Implications of surfactant-induced flow for miscible-displacement estimation of air-water interfacial areas in unsaturated porous media.},
  author={Molly S. Costanza-Robinson and Zheng Zheng and Eric J. Henry and Benjamin D. Estabrook and Malcolm H. Littlefield},
  journal={Environmental science & technology},
  year={2012},
  volume={46 20},
  pages={
          11206-12
        }
}
Surfactant miscible-displacement experiments represent a conventional means of estimating air-water interfacial area (A(I)) in unsaturated porous media. However, changes in surface tension during the experiment can potentially induce unsaturated flow, thereby altering interfacial areas and violating several fundamental method assumptions, including that of steady-state flow. In this work, the magnitude of surfactant-induced flow was quantified by monitoring moisture content and perturbations to… CONTINUE READING
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