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Related Experiment Videos

Visualisation of structure and flow in packed beds

A J Sederman1, M L Johns, P Alexander

  • 1Department of Chemical Engineering, University of Cambridge, UK.

Magnetic Resonance Imaging
|November 6, 1998
PubMed
Summary
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Magnetic resonance imaging reveals significant flow heterogeneity in packed beds. A small fraction of pores carry a disproportionately large volume of fluid, impacting overall flow dynamics.

Area of Science:

  • Fluid dynamics
  • Biomedical engineering
  • Materials science

Background:

  • Understanding fluid flow through porous media is crucial in various scientific and engineering fields.
  • Packed beds are common in chemical reactors, filters, and biological systems.
  • Characterizing the relationship between pore structure and flow behavior is essential for process optimization.

Purpose of the Study:

  • To investigate structure-flow correlations within the interparticle space of a packed bed using advanced Magnetic Resonance Imaging (MRI) techniques.
  • To quantify the heterogeneity of fluid flow and identify pores with anomalous flow characteristics.

Main Methods:

  • Utilized MRI volume and velocity-measurement techniques to obtain 3D flow data.
  • Acquired images of three orthogonal velocity components in axial and radial slices.

Related Experiment Videos

  • Analyzed 3D volume images to partition interparticle space into pores and identify pore necks.

    • Main Results:

    • Observed significant heterogeneity in fluid flow within the packed bed.
    • Identified that approximately 8% of pores carried 40% of the total volume flow.
    • Characterized the specific features of pores exhibiting anomalously high flow rates and velocities.

    Conclusions:

    • The study demonstrates the power of MRI in elucidating complex flow patterns in packed beds.
    • Findings highlight the critical role of specific pore structures in driving bulk flow behavior.
    • Results provide valuable insights for designing and optimizing systems involving fluid flow through porous media.