Deriving Thermophysical Properties of Undercooled Liquid Zr from Radiative Cooling Curves Measured by Containerless Electrostatic Levitation : Instrumentation, Measurement, and Fabrication Technology

概要

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An analytical way of deriving constant pressure specific heat c_P(T) and hemispherical total emissivity ε_T(T) of materials in the undercooled liquid state is presented. A t(T) function in a time-temperature profile was analytically determined from the radiative cooling curves of Zr measured by electrostatic levitation (ESL) in which a bulk sample was electrostatically charged and levitated then melted by laser irradiation in high vacuum. The cooling behavior of liquid Zr was found to be well described by an inverse bi-quadratic polynomial of t(T). The c_P(T)/ε_T(T) ratio was then estimated, and ε_T(T) and c_P(T) were calculated; they were found to be consistent with the reference data in the literature. This implies that the rationale behind the analytical approach taken in this study is reasonable and can be applied to estimating the c_P(T)/ε_T(T) ratio, thus further facilitating derivation of ε_T(T) and c_P(T) of various materials.
社団法人応用物理学会の論文
2002-08-01