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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is purely axial,...
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Steering liquid metal flow in microchannels using low voltages.

Shi-Yang Tang1, Yiliang Lin, Ishan D Joshipura

  • 1School of Electrical and Computer Engineering, RMIT University, Melbourne, Australia. khashayar.khoshmanesh@rmit.edu.au.

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|August 18, 2015
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Summary

This study introduces a novel, low-voltage method to control the flow of liquid metal (eutectic gallium indium) in microfluidic systems. This technique acts as a valve, directing liquid metal through complex networks without mechanical parts.

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Area of Science:

  • Materials Science
  • Microfluidics
  • Electrochemistry

Background:

  • Liquid metals like eutectic gallium indium (EGaIn) are used in microfluidics for applications such as soft electrodes and stretchable electronics.
  • Controlling the dynamic flow of liquid metals in complex microfluidic networks is challenging.

Purpose of the Study:

  • To develop a simple, voltage-controlled method for directing the flow of liquid metal in microfluidic networks.
  • To enable shape-reconfigurable metallic structures using dynamic liquid metal flow control.

Main Methods:

  • Applying low voltage to eutectic gallium indium (EGaIn) liquid metal within microchannels.
  • Utilizing electrocapillarity to lower interfacial tension and electro-oxidation to create mechanical impediments.
  • Employing voltage polarity to direct liquid metal flow towards specific outlets.

Main Results:

  • Demonstrated a novel valving system for directional liquid metal flow control in complex microfluidic networks.
  • Achieved proof-of-concept control over liquid metal flow to single or multiple directions simultaneously.
  • Showcased a method that operates without mechanical moving parts.

Conclusions:

  • A simple, low-voltage method effectively directs liquid metal flow in microfluidics, acting as a dynamic valve.
  • This technique offers a new route for controlling liquid metal pathways in microfluidics, optics, electronics, and microelectromechanical systems.