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Related Concept Videos

Laminar Flow01:27

Laminar Flow

2.6K
Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
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Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

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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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Related Experiment Video

Updated: Mar 31, 2026

Combining Fluidic Devices with Microscopy and Flow Cytometry to Study Microbial Transport in Porous Media Across Spatial Scales
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Using confined bacteria as building blocks to generate fluid flow.

Zhiyong Gao1, He Li, Xiao Chen

  • 1Department of Physics and Astronomy and Institute of Natural Sciences, Shanghai Jiao Tong University, Shanghai, China. hepeng_zhang@sjtu.edu.cn.

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|October 27, 2015
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Summary

Researchers used confined bacteria as microscopic pumps to transport materials at the micro/nanoscale. This novel approach leverages bacterial flagella to generate controlled fluid flow for bio-hybrid devices.

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Area of Science:

  • Biophysics
  • Microfluidics
  • Bio-hybrid systems

Background:

  • Material transport at micro/nanometer scales is crucial for technological applications.
  • Conventional methods often rely on macroscopic pumps like syringe pumps, which are unsuitable for micro-scale operations.

Purpose of the Study:

  • To investigate the potential of using motile bacteria as microscopic pumps for material transport.
  • To develop a bio-hybrid system capable of controlled micro-scale fluid manipulation.

Main Methods:

  • Micro-fabricated structures were used to confine smooth-swimming bacteria in specific configurations.
  • Bacterial flagella rotation was harnessed to collectively generate fluid flow.
  • Different micro-structures were combined to achieve functions like particle collection and dispersion.
  • Experimental results were validated using numerical simulations.

Main Results:

  • Confined bacteria collectively generated fluid flow through flagellar rotation.
  • The generated flow could transport materials along designed trajectories.
  • Complex functions such as particle collection and dispersion were successfully realized.
  • Numerical simulations accurately reproduced the experimental findings.

Conclusions:

  • Motile bacteria can be effectively utilized as microscopic pumps for controlled material transport.
  • This method offers a novel approach for generating micro-scale transport flow.
  • The developed technique opens possibilities for driving bio-hybrid devices.