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Related Experiment Video

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Combining Fluidic Devices with Microscopy and Flow Cytometry to Study Microbial Transport in Porous Media Across Spatial Scales

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Enhanced Reaction Kinetics in Stationary Two-Phase Flow through Porous Media.

Xueyi Zhang^1,2, Zhi Dou¹, Mayumi Hamada^3,4

¹School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China.

Environmental Science & Technology

|January 8, 2025

Summary

Multiphase flow dynamics significantly impact mixing-driven reactions in porous media. Product formation accelerates beyond diffusive time and depends on nonwetting phase flow rates, unlike previous unsaturated flow findings.

Keywords:

mixing dynamics multiphase flow pore-scale reactive transport

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Area of Science:

Environmental science
Chemical engineering
Geophysics

Background:

Understanding multiphase flow and reactive transport in porous media is crucial for environmental and industrial applications.
Nonwetting immiscible phases can be immobile (unsaturated flow) or mobile (multiphase flow).
Previous studies show varying reaction product trends based on flow rate or Péclet number under unsaturated conditions.

Purpose of the Study:

To investigate the impact of multiphase flow dynamics on mixing-driven reactions.
To address experimental and numerical challenges in studying these interactions.
To assess how product formation is affected by stationary two-phase flow conditions.

Main Methods:

Utilized an optimized chemiluminescence reaction.
Employed an experimental setup for separate reactant injection.
Maintained a stationary two-phase flow system.

Main Results:

Reaction product mass increased faster than Fickian beyond diffusive time.
Global kinetics initially rose, then decreased with fluctuations due to nonwetting phase displacement.
Product formation was dependent on the nonwetting phase flow rate for a given wetting phase flow rate.

Conclusions:

Multiphase flow significantly alters reactive transport compared to unsaturated flow.
Nonwetting phase flow rate is a critical parameter influencing reaction product formation.
Experimental insights into complex porous media flow and reaction dynamics were gained.