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Related Concept Videos

Joule-Thomson Effect01:21

Joule-Thomson Effect

The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...

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Characterization of Thermal Transport in One-dimensional Solid Materials
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A thermo-optical plane source method to measure thermal conductivity.

Jeffrey L Braun1, Bryan N Baines1, John T Gaskins1

  • 1Laser Thermal Analysis, Inc., 937 2nd St. SE, Charlottesville, Virginia 22902, USA.

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A new Thermo-Optical Plane Source (TOPS) technique accurately measures material thermal conductivity. This versatile method works on solids, liquids, gels, and pastes with minimal sample prep, offering a direct thermal conductivity measurement.

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Area of Science:

  • Materials Science
  • Thermal Physics
  • Analytical Chemistry

Background:

  • Accurate measurement of thermal conductivity is crucial for material characterization and performance prediction.
  • Existing methods often require extensive sample preparation, specific geometries, or prior knowledge of material properties like density and specific heat.
  • A need exists for a versatile, high-throughput technique applicable across diverse material states.

Purpose of the Study:

  • To introduce and validate a novel Thermo-Optical Plane Source (TOPS) technique for measuring thermal conductivity.
  • To demonstrate the technique's applicability to a wide range of materials, including solids, liquids, gels, and pastes.
  • To establish TOPS as a method that directly measures thermal conductivity without needing density or specific heat data.

Main Methods:

  • Utilized laser heating to induce a steady-state temperature rise in the material.
  • Employed infrared thermography to precisely measure the resultant temperature distribution.
  • Applied Fourier's law of heat conduction to directly calculate thermal conductivity from the measured temperature gradient and heat flux.

Main Results:

  • Successfully demonstrated the TOPS technique for measuring thermal conductivity.
  • Achieved accurate measurements across a broad range of thermal conductivities, from 0.03 to 60 Wm-1 K-1 at room temperature.
  • Confirmed the technique's versatility by applying it to solids, liquids, gels, and pastes without modification.

Conclusions:

  • The Thermo-Optical Plane Source (TOPS) technique provides a direct, efficient, and versatile method for determining material thermal conductivity.
  • TOPS minimizes sample preparation and geometric constraints, making it suitable for high-throughput analysis.
  • This technique eliminates the need for prior knowledge of material density and specific heat, simplifying the measurement process.