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Related Concept Videos

Energy Considerations in Open Channel Flow01:27

Energy Considerations in Open Channel Flow

Open channel flow, where a fluid flows with a free surface exposed to the atmosphere, is primarily governed by gravitational and surface effects, distinguishing it from closed conduit or pipe flow. In open channels such as rivers, canals, and artificial channels, energy analysis provides valuable insights into flow behavior and the relationship between depth, velocity, and slope.Specific Energy and Flow DepthIn open channel flow, the specific energy, E, combines the gravitational potential...
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Pressure of Fluids01:14

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Fluid Pressure01:14

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Laminar and Turbulent Flow01:07

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Rapidly Varying Flow01:24

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Updated: Jun 3, 2026

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
08:32

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

Pressure-driven flow in open fluidic channels.

Nicholas Davey1, Adrian Neild

  • 1Department of Mechanical & Aerospace Engineering, Monash University, Clayton VIC 3800, Australia.

Journal of Colloid and Interface Science
|March 12, 2011
PubMed
Summary
This summary is machine-generated.

Researchers created high-speed fluid flow in confined channels using contact angle hysteresis. This technique enables efficient fluid handling for applications like contaminant detection and microfluidic interfacing.

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Last Updated: Jun 3, 2026

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels
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High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices
10:22

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices

Published on: September 2, 2009

Area of Science:

  • Fluid dynamics
  • Surface science
  • Microfluidics

Background:

  • Large contact angle hysteresis occurs at boundaries between hydrophilic and hydrophobic surfaces, enabling fluid retention.
  • Similar fluid retention effects are observed at the edges of solid surfaces.

Purpose of the Study:

  • To investigate pressure-driven fluid flow through a volume confined to a narrow strip.
  • To explore the achievable flow rates and velocities in such confined systems.
  • To analyze the fluid volume shapes under static and dynamic conditions within the strip.

Main Methods:

  • Utilizing pressure-driven flow to induce movement in a fluid volume confined to a 1 mm wide glass strip.
  • Measuring flow rates and determining maximum flow velocity through experimental data and modeling.
  • Analyzing fluid volume shapes by considering minimum energy states for static fluids and observing dynamic flow patterns.

Main Results:

  • Achieved very high flow rates, reaching up to 500 μL/min over a 30 mm length.
  • Maximum flow velocity was determined to be 0.13 m/s through modeling.
  • Demonstrated fluid flow through two characteristic shapes: a cylindrical section and a pronounced bulge, corresponding to static fluid configurations.

Conclusions:

  • The combination of fluid confinement via high contact angle hysteresis and induced flow enables novel applications.
  • Potential applications include airborne contaminant detection and real-time fluid composition analysis.
  • Facilitates straightforward interfacing between microfluidic systems and external devices.