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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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Uniform Depth Channel Flow01:27

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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Gradually Varying Flow01:29

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Gradually varying flow (GVF) in open channels describes situations where water depth changes slowly along the channel due to factors like non-uniform bed slope, channel shape variations, or obstructions. This flow type occurs when the depth adjusts gradually to balance gravitational forces, shear forces, and energy requirements, resulting in a low rate of depth change.Characteristics of Gradually Varying FlowGVF is commonly observed in natural streams, rivers, and canals, where flow depth...
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Multi-directional bubble generated streaming flows.

Tamsin A Spelman1, Olivier Stephan2, Philippe Marmottant2

  • 1School of Mathematics and Statistics, University of Glasgow, Glasgow G12 8QQ, United Kingdom; DAMTP, University of Cambridge, Cambridge CB3 0WA, United Kingdom.

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Summary
This summary is machine-generated.

Multiple holes on Armoured Microbubbles (AMBs) enhance microfluidic streaming flow. More holes create stronger circulations, but too many lead to source-sink flow, with independent activation possible for multi-directional propulsion.

Keywords:
MicrobubbleMixingSelf-propulsionStreaming

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Acoustic manipulation

Background:

  • Armoured Microbubbles (AMBs) are hollow partial spheres containing a bubble, previously used for microfluidic mixing and self-propulsion.
  • Ultrasound-induced bubble oscillations in AMBs generate streaming flows with velocities ranging from 1-100 mm/s.

Purpose of the Study:

  • To investigate the effect of multiple surface holes on the hydrodynamic behavior of Armoured Microbubbles (AMBs).
  • To explore the potential of multi-holed AMBs for advanced microfluidic applications and controlled propulsion.

Main Methods:

  • Fabrication of AMBs with varying numbers and sizes of surface holes, inspired by C60 fullerene geometry.
  • Experimental analysis of fluid flow patterns generated by oscillating multi-holed AMBs under ultrasound.
  • Investigation of independent hole activation for controlled microbubble manipulation.

Main Results:

  • Increasing the number of holes on AMBs generates additional pairs of fast circulations.
  • Beyond an optimal number, circulations diminish, and in-plane flow transitions to a source or sink-dominated regime.
  • AMBs with two distinct hole sizes demonstrated independent activation of each hole.

Conclusions:

  • The number and arrangement of holes significantly influence the flow dynamics around AMBs.
  • Multi-holed AMBs offer tunable hydrodynamic properties for microfluidic applications.
  • Independent hole activation presents a pathway for developing multi-directional microswimmers.