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Related Experiment Videos

Frequency-dependent transversal flow control in centrifugal microfluidics.

Thilo Brenner1, Thomas Glatzel, Roland Zengerle

  • 1IMTEK-University of Freiburg, Laboratory for MEMS Applications, Georges-Koehler-Allee 106, D-79110 Freiburg, Germany. tbrenner@imtek.de

Lab on a Chip
|January 27, 2005
PubMed
Summary

This study introduces a novel Coriolis flow switch for centrifugal microfluidic platforms. The switch uses rotational force to direct fluid flow, demonstrating a new method for microfluidic control.

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Area of Science:

  • Microfluidics
  • Mechanical Engineering
  • Fluid Dynamics

Background:

  • Centrifugal microfluidic platforms require precise fluid control.
  • Existing flow switching mechanisms can be complex or require external actuation.

Purpose of the Study:

  • To present a novel, solely Coriolis force-actuated flow switch for centrifugal microfluidic devices.
  • To characterize the performance and threshold frequency of this Coriolis switch.

Main Methods:

  • Design of an inverse Y-structure microfluidic channel on a rotating disk.
  • Experimental measurement of flow switching at varying rotational frequencies.
  • Computational Fluid Dynamics (CFD) simulations to validate experimental findings.

Main Results:

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  • The Coriolis switch successfully diverted flow into one of two outlets above a threshold frequency.
  • The measured threshold frequency was 350 rad/s (approx. 55.7 Hz) for specified channel dimensions.
  • CFD simulations corroborated the experimental results, confirming Coriolis force dominance.

Conclusions:

  • The Coriolis force can be effectively utilized as the sole actuation mechanism for flow switching in centrifugal microfluidics.
  • This novel switch offers a simple, reliable, and potentially cost-effective solution for microfluidic control.
  • The demonstrated principle opens avenues for advanced automated fluid handling in micro-devices.