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In-plane thermal diffusivity measurement of thin plates by the transient fin method.

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The transient fin method now measures thermal diffusivity in low-diffusivity plastics. Accurate results require low gas pressure (below 10⁻² mbar) to minimize heat conduction errors.

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Area of Science:

  • Materials Science
  • Thermal Analysis
  • Heat Transfer

Background:

  • The transient fin method is established for measuring in-plane thermal diffusivity in highly diffusive materials like thin plates.
  • Existing methods face challenges when applied to low-diffusivity materials, such as plastics.

Purpose of the Study:

  • To extend the transient fin method for accurate thermal diffusivity measurements in low-diffusivity materials.
  • To develop a new analytical model in real space, bypassing potentially inaccurate Laplace transforms of experimental data.

Main Methods:

  • Utilized a new analytical model in real space for temperature analysis.
  • Conducted experiments on plastic materials at varying gas pressures (10⁻² mbar to 1 bar).

Main Results:

  • Identified significant influence of surrounding air's heat conduction on measurements, causing up to 30% error at atmospheric pressure.
  • Demonstrated that accurate thermal diffusivity measurements are achievable at pressures below 10⁻² mbar.

Conclusions:

  • The modified transient fin method is suitable for low-diffusivity materials.
  • Controlling gas pressure is critical for accurate thermal diffusivity measurements, with low pressures (< 10⁻² mbar) being essential.