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Couette Flow

Couette Flow

Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...

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Laminar and Turbulent Flow

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Related Experiment Video

Updated: May 18, 2026

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO₂ Foam Transport in Fractured Unconventional Reservoirs

Published on: July 2, 2020

Anomalous coalescence in sheared two-dimensional foam.

Hadi Mohammadigoushki¹, Giovanni Ghigliotti, James J Feng

¹Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, British Columbia, V6T 1Z3 Canada.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|September 26, 2012

Summary

This summary is machine-generated.

Bubble rafts in a Couette device only coalesce above a critical shear rate, defying conventional theories. This anomalous bubble coalescence depends on bubble size and liquid viscosity, suggesting inertial forces play a key role.

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Area of Science:

Fluid dynamics
Colloid science
Rheology

Background:

Conventional understanding suggests bubbles and drops coalesce at lower shear rates.
Bubble rafts, monolayers of bubbles on liquid, present unique coalescence behaviors.

Purpose of the Study:

To investigate the coalescence of bubbles in a narrow-gap Couette device.
To identify the critical shear rate for bubble coalescence in a bubble raft.
To explore mechanisms behind anomalous coalescence behaviors.

Main Methods:

Experimental study using a narrow-gap Couette device.
Shearing a monolayer of monodisperse bubbles floating on liquid.
Visualization and scaling arguments to analyze coalescence.

Main Results:

Bubble coalescence in a bubble raft occurs only above a threshold shear rate.
The threshold shear rate increases with bubble size and liquid viscosity.
Observed behaviors contradict predictions based on capillary number.

Conclusions:

The study reveals anomalous bubble coalescence in a shear flow.
Inertial forces, causing radial compression and accelerating film drainage, are a promising explanation for the observed phenomena.