Parametric Study on the Effect of Radiation Heat Loss and Non-Constant Heating in the Electrothermal Technique for Thermal Property Measurement of Micro/Nanoscale Fibers

C. Xing, T. Munro, C. Jensen, H. Ban
Utah State University, US

Keywords: electrothermal technique, thermophysical property, fiber measurement


This paper presents a parametric study of the effects of radiation heat loss and non-constant heating on the measurement accuracy of thermal properties of micro/nanoscale fibers using the Transient Electrothermal technique. In the original derivation, assumptions were made to neglect the two effects to simplify the solution. However, they were experimentally found to become significant as the sample diameter is reduced. To establish criteria for applicability of the reduced model, numerical “experiments” were used to yield analysis data while parametrically varying material properties, geometries, and working conditions. The documented and our full models were then used to extract thermal conductivity and diffusivity from the numerical data. Measurement deviation was found to have linear relationships to both the radiation loss and the non-constant heat generation. For practical use, an experimental designer/user can estimate the error associated with these sources from the resulting diagrams. The findings of this study are beneficial for the accurate measurement of thermal properties of micro/nanoscale filament-like samples, including electrical conductors and nonconductors. These results are especially important in the current development of synthetic spider silk for quantifying and improving its thermal properties.