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Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
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Related Experiment Video

Updated: Feb 19, 2026

Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Bubble propagation on a rail: a concept for sorting bubbles by size.

Andrés Franco-Gómez1, Alice B Thompson, Andrew L Hazel

  • 1Manchester Centre for Nonlinear Dynamics & School of Physics & Astronomy, The University of Manchester, Manchester M13 9PL, UK. anne.juel@manchester.ac.uk.

Soft Matter
|November 11, 2017
PubMed
Summary
This summary is machine-generated.

Researchers developed a passive fluidic sorting device using a simple rail in a channel. This device separates air bubbles in silicone oil based on size, offering a new method for two-phase flow control.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Two-phase flow

Background:

  • Two-phase fluid flows are common in industrial processes.
  • Efficient separation of components in multiphase flows is crucial.
  • Passive sorting devices offer simple and robust solutions.

Purpose of the Study:

  • To investigate the use of a rail as a passive sorting device for air bubbles in silicone oil.
  • To understand the bubble size-dependent segregation mechanism.
  • To develop a theoretical model for the observed phenomena.

Main Methods:

  • Experimental demonstration of bubble transport in a channel with a rail.
  • Varying flow rates and rail dimensions to observe bubble behavior.
  • Theoretical analysis using a depth-averaged fluid dynamics model.

Main Results:

  • A rail effectively sorts air bubbles by size in a two-phase flow.
  • A critical flow rate determines the onset of size-dependent segregation.
  • Bubble size selection is tunable by adjusting rail width and flow rate.

Conclusions:

  • The rail acts as a robust passive sorting device for two-phase flows.
  • The sorting mechanism involves a dynamic interplay of capillary and viscous forces.
  • The developed theory qualitatively matches experimental observations.