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Related Experiment Video

Updated: Mar 26, 2026

Window on a Microworld: Simple Microfluidic Systems for Studying Microbial Transport in Porous Media

Window on a Microworld: Simple Microfluidic Systems for Studying Microbial Transport in Porous Media

Published on: May 3, 2010

Upstream Swimming in Microbiological Flows.

Arnold J T M Mathijssen¹, Tyler N Shendruk¹, Julia M Yeomans¹

¹The Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, United Kingdom.

Physical Review Letters

|January 30, 2016

Summary

This summary is machine-generated.

Microswimmers in non-Newtonian fluids exhibit unique upstream migration patterns. Viscoelastic normal stresses reorient swimmers, enabling centerline migration and offering a novel microbe sorting mechanism based on swimming speed.

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Published on: November 25, 2020

Area of Science:

Fluid dynamics
Microbiology
Biophysics

Background:

Microorganism interactions with fluid environments are crucial.
Understanding microswimmer behavior in complex flows is essential for biological systems.

Purpose of the Study:

To model microswimmer dynamics in non-Newtonian Poiseuille flows.
To investigate the effects of fluid rheology on microswimmer migration and orientation.

Main Methods:

Development of a theoretical model for microswimmer dynamics.
Simulation of microswimmer behavior in shear-thickening and shear-thinning fluids.
Analysis of viscoelastic normal stress effects on swimmer orientation and migration.

Main Results:

Microswimmers migrate upstream faster in shear-thickening fluids and slower in shear-thinning fluids compared to Newtonian fluids.
Viscoelastic normal stresses reorient swimmers towards the centerline.
Centerline migration is observed, contrasting with boundary accumulation in quiescent Newtonian fluids.

Conclusions:

Non-Newtonian fluid properties significantly alter microswimmer migration dynamics.
Viscoelastic normal stresses provide a mechanism for centerline accumulation.
A potential sorting mechanism for microbes based on swimming speed is proposed.