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The Frequency Domain Thermoreflectance Technique for Thermal Property Measurements
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Optical probe for high-temperature local void fraction determination.

M A Vince1, H Breed, G Krycuk

  • 1Rensselaer Polytechnic Institute, Troy, New York 12181, USA.

Applied Optics
|April 8, 2010
PubMed
Summary
This summary is machine-generated.

This study optimized an optical void fraction device using light ray tracing simulations. The improved design enhances the measurement of void fraction in high-temperature and pressure environments.

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Area of Science:

  • Optical physics
  • Fluid dynamics
  • Materials science

Background:

  • Void fraction measurement is crucial in multiphase flow systems.
  • Existing methods face challenges in high-temperature and pressure conditions.
  • Optical probes offer a non-intrusive measurement technique.

Purpose of the Study:

  • To optimize the optical response of a void fraction device for high-temperature and pressure applications.
  • To develop a robust and accurate optical void fraction measurement system.

Main Methods:

  • Utilized 2-D light ray tracing computer simulations.
  • Incorporated Snell's law, Beer's law (absorption), and Fresnel laws (reflection/refraction).
  • Designed and constructed a diamond-tipped optical void probe based on simulation results.

Main Results:

  • Achieved an optimized optical design through simulation.
  • Successfully constructed and tested a diamond-tipped optical void fraction device.
  • Demonstrated device functionality in low-pressure air/water flows.

Conclusions:

  • Computer simulation is effective for optimizing optical void fraction devices.
  • The diamond-tipped optical probe shows potential for void fraction measurement in demanding conditions.
  • Further testing is warranted to validate performance at high temperatures and pressures.