A New Method for Simultaneous Determination of Anisotropic Thermal Conductivities Based on Two-Dimensional Analysis

概要

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A new experimental setup and analysis method for simultaneous determination of the anisotropic thermal conductivities ($\kappa_{x}$, $\kappa_{y}$) is proposed for materials with uniaxial anisotropy or a layered structure. By applying heat power diagonally through the sample from a heater to a cold finger, temperature differences ($\Delta T_{x}$, $\Delta T_{y}$) along the two directions were monitored. The monitored temperature differences were compared with $\Delta T_{x}^{\prime}$ and $\Delta T_{y}^{\prime}$, which were calculated by solving a two-dimensional heat diffusion equation. Calculations were repeated until $\Delta T_{x}^{\prime}$ and $\Delta T_{y}^{\prime}$ agreed with $\Delta T_{x}$ and $\Delta T_{y}$, to determine $\kappa_{x}$ and $\kappa_{y}$. This technique was applied to a carbon-fiber-reinforced plastic (CFRP) from 40 K to 200 K and a satisfactory agreement was achieved with the $\kappa_{x}$ and $\kappa_{y}$ values and those determined from independent measurements of $\kappa_{x}$ and $\kappa_{y}$.
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
2001-01-15