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Related Experiment Video

Updated: Jan 27, 2026

Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature

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Published on: November 26, 2019

Fluid flow through packings of elastic shells.

Pawel Gniewek¹, Oskar Hallatschek²

¹Biophysics Graduate Group, University of California, Berkeley, California 94720, USA.

Physical Review. E

|April 3, 2019

Summary

Fluid flow in compacted granular materials abruptly stops below a critical porosity, behaving like a percolation transition. This study models liquid transport in deformable shells, revealing insights into porous media flow.

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Area of Science:

Physics
Materials Science
Geophysics

Background:

Fluid transport in porous materials is well-studied in geological and idealized systems.
However, fluid flow through compacted, deformable granular materials remains underexplored.

Purpose of the Study:

To investigate liquid transport in packings of deformable elastic shells.
To understand the critical porosity threshold for fluid flow cessation.

Main Methods:

Utilized finite-element and lattice-Boltzmann methods for numerical simulations.
Developed a simplified permeability model using disordered capillaries.

Main Results:

Identified an abrupt vanishing of fluid flow below a critical porosity.
Observed flow obstruction characteristics of a percolation transition.
Showcased that hydraulic tortuosity diverges and hydraulic radius decreases near the percolation threshold.

Conclusions:

Fluid flow in compacted granular materials exhibits percolation transition phenomena.
A simplified model of disordered capillaries effectively captures flow behavior.
Results align with scaling predictions from percolation theory for random sphere packings.