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A Microfluidic System with Surface Patterning for Investigating Cavitation Bubble(s)–Cell Interaction and the Resultant Bioeffects at the Single-cell Level
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Cavitation bubble dynamics in microfluidic gaps of variable height.

Pedro A Quinto-Su1, Kang Y Lim, Claus-Dieter Ohl

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, Singapore.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|November 13, 2009
PubMed
Summary

Laser-induced cavitation bubbles in narrow gaps show increased lifetime and slower, planar flows as gap size decreases. These findings impact microfluidic applications like cell lysis.

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Area of Science:

  • Fluid dynamics
  • Laser-induced phenomena
  • Microfluidics

Background:

  • Laser-induced cavitation bubbles are crucial in various microfluidic applications.
  • Understanding bubble dynamics in confined geometries is essential for controlling these applications.

Purpose of the Study:

  • To experimentally investigate the dynamics of laser-induced cavitation bubbles within narrow gaps.
  • To compare bubble behavior in confined gaps versus semi-unbounded fluids.

Main Methods:

  • Cavitation bubbles were generated using pulsed laser light at a constant energy.
  • Bubble dynamics were captured using high-speed imaging across varying gap heights (15–400 microm).
  • Experimental results were compared with potential flow models.

Main Results:

  • Bubble lifetime increased by up to 50% as gap height decreased.
  • Maximum projected bubble radius remained constant regardless of gap size.
  • Flows induced by bubbles in smaller gaps became essentially planar, exhibiting reduced shear.

Conclusions:

  • Narrow gaps significantly alter laser-induced cavitation bubble dynamics.
  • Reduced gap height leads to longer bubble lifetimes and planar, slower flows.
  • Findings offer insights for tuning microfluidic interactions in applications like cell lysis and poration.