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Related Experiment Videos

Hydrodynamics in two-phase flow within porous media.

Laura D Anadon1, Matthew H M Lim, Andrew J Sederman

  • 1University of Cambridge, Department of Chemical Engineering, Pembroke Street, Cambridge CB2 3RA, UK.

Magnetic Resonance Imaging
|April 19, 2005
PubMed
Summary

Ultra-fast magnetic resonance imaging visualizes air-water flow in porous media. This study captures dynamic pulsing events during flow transitions, revealing instabilities as liquid velocity increases.

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Area of Science:

  • Chemical Engineering
  • Fluid Dynamics
  • Imaging Science

Background:

  • Understanding multiphase flow in packed beds is crucial for chemical processes.
  • Previous imaging techniques lacked the speed and resolution to capture dynamic flow instabilities.
  • Air-water co-current down flow in porous media exhibits complex flow regimes like trickle and pulsing flow.

Purpose of the Study:

  • To visualize and analyze liquid distribution in 2D and 3D during air-water co-current down flow in a packed bed.
  • To investigate the local pulsing events and instabilities occurring during the trickle-to-pulse flow transition.
  • To study the evolution of these instabilities as a function of increasing liquid velocity.

Main Methods:

  • Utilized ultra-fast magnetic resonance imaging (MRI) techniques.

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  • Acquired 2D and 3D images with spatial resolutions of 1.4 mm x 2.8 mm and 3.75 mm x 3.75 mm x 1.87 mm, respectively.
  • Employed data acquisition times of 20 ms (2D) and 280 ms (3D) during air-water flow through a fixed bed of porous pellets.

    • Main Results:

    • Successfully imaged local pulsing events within the packed bed during the trickle-to-pulse flow transition.
    • Observed the dynamic evolution of flow instabilities with increasing liquid velocity at a constant gas velocity.
    • Provided detailed 2D and 3D visualizations of liquid distribution under different flow regimes.

    Conclusions:

    • Ultra-fast MRI is effective for capturing transient flow phenomena in packed beds.
    • Local instabilities and pulsing events are key features of the trickle-to-pulse flow transition.
    • Liquid velocity significantly influences the development and evolution of flow instabilities in this system.