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Quantification of cavitating flows with neutron imaging.

I K Karathanassis1, M Heidari-Koochi2,3, F Koukouvinis2,4

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Neutron imaging quantifies cavitation in microfluidics. This technique visualizes vapor content and flow regimes, revealing how fluid properties like viscoelasticity impact cavitation structures.

Keywords:
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Area of Science:

  • Fluid dynamics
  • Materials science
  • Neutron imaging applications

Background:

  • Cavitation quantification is crucial for understanding fluid flow in microdevices.
  • Existing methods struggle to visualize and quantify cavitation at the microscale.
  • Neutron imaging offers potential for non-invasive, high-resolution visualization.

Purpose of the Study:

  • To demonstrate neutron imaging for quantifying cavitation in microfluidic devices.
  • To visualize and differentiate cavitation regimes with high spatial resolution.
  • To investigate the effect of fluid rheology on cavitation morphology.

Main Methods:

  • Utilized neutron imaging with a 16 μm spatial resolution and a 12.9 × 12.9 mm² field of view.
  • Quantified vapor content within an orifice under abruptly constricting geometry.
  • Compared a reference liquid with a viscoelastic fluid containing a Quaternary Ammonium Salt (QAS) agent.

Main Results:

  • Successfully visualized different cavitation regimes with high fidelity.
  • Quantified subtle differences in cavitation between fluids with varying rheological properties.
  • Observed that viscoelastic additives promote localized vortical cavities over cloud-like structures.

Conclusions:

  • Neutron imaging is suitable for quantifying in-nozzle cavitating flow at the micrometer level.
  • This technique elucidates distinct forms of vaporous structures in microfluidic cavitation.
  • Established the potential of neutron irradiation for two-phase flow quantification in metallic microfluidics.