Simultaneously estimating the thermal conductivity and thermal diffusivity of a poorly conducting solid material...

Area of Science:

• Materials Science
• Thermodynamics
• Experimental Physics

Background:

• Accurate measurement of thermal properties is crucial for material selection and performance prediction.
• Existing methods for determining thermal conductivity and thermal diffusivity often require separate experiments or complex sample preparation.

Purpose of the Study:

• To present a novel experimental method for the simultaneous determination of thermal conductivity and thermal diffusivity.
• To introduce a new surface probe designed for efficient thermal property measurement.

Main Methods:

• A new surface probe incorporating a resistance heater, thermocouples, and a heat flux sensor was developed.
• The method involves heating a portion of the sample surface and analyzing temperature measurements at two distinct regions.
• Two distinct functions, based on surface temperature measurements and different thermal concepts, are minimized to extract thermal properties.

Main Results:

• The developed technique allows for the simultaneous acquisition of thermal conductivity and thermal diffusivity.
• Thermal diffusivity is determined by minimizing a function based on the gain ratio of surface temperatures.
• Thermal conductivity is estimated by minimizing the square quadratic error between experimental and theoretical surface temperatures.

Conclusions:

• The presented experimental method offers a streamlined approach to characterizing solid materials.
• This technique provides a reliable means for simultaneously obtaining key thermal transport properties.
• The innovative surface probe design facilitates efficient and accurate thermal property measurements.