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Understanding diffusion-controlled bubble growth in porous media using experiments and simulations.

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Researchers studied gas bubble expansion in porous media using microfluidic chips. Larger pressure drops accelerate bubble growth but reduce critical gas saturation for liquid displacement.

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Area of Science:

  • Multiphase flow
  • Porous media physics
  • Geochemistry

Background:

  • Gas bubble nucleation and expansion in porous media are critical for oil recovery, carbon storage, and boiling.
  • Understanding bubble dynamics is essential for optimizing these processes.

Purpose of the Study:

  • To investigate the dynamics of single gas bubble growth within porous media.
  • To correlate pressure drop with bubble growth rate and critical gas saturation.

Main Methods:

  • Utilized microfluidic chips for controlled visualization of carbon dioxide bubble growth in supersaturated dodecane.
  • Employed a nonlinear pore-network model to simulate bubble expansion dynamics.

Main Results:

  • Observed bubble growth driven by diffusion of dissolved gas molecules to the gas-liquid interface.
  • Demonstrated that increased pressure drops enhance bubble growth velocity.
  • Found that higher pressure drops lead to lower critical gas saturations, impacting liquid displacement.

Conclusions:

  • Experimental results provide unique insights into single bubble growth dynamics in porous media.
  • Model predictions show good agreement with experimental data, highlighting the need for further theoretical refinement.
  • Further theoretical development is required to accurately model deviations from invasion-percolation under high pressure drops.