A Procedure for Application of the Three-Omega Method to Measurement of Gas Thermal Conductivity

被引：9

作者：

Yusibani, Elin ^{[1
]}

Woodfield, Peter Lloyd ^{[2
]}

Moroe, Shogo ^{[1
]}

Shinzato, Kanei ^{[2
]}

Kohno, Masamichi ^{[1
]}

Takata, Yasuyuki ^{[1
]}

Fujii, Motoo ^{[2
]}

机构：

[1] Kyushu Univ, Dept Mech Engn, Nishi Ku, Fukuoka, Japan

[2] AIST, Res Ctr Hydrogenius, Nishi Ku, Fukuoka, Japan

来源：

JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY | 2009年 / 4卷 / 01期

关键词：

Air; Thermal Conductivity; Curve Fitting; Three-Omega; Heat Capacity; HOT-WIRE METHOD; DIFFUSIVITY; TRANSPORT; HYDROGEN;

D O I：

10.1299/jtst.4.146

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

A non-linear least-squares curve-fitting procedure is proposed to analyze three-omega voltage data from a fine wire in a gas sample using the three-omega method. The method uses both three-omega components of the voltage arising from a sinusoidal heating current to determine the thermal conductivity of the surrounding medium. The proposed procedure is tested against simulated data and some experimental data for air at atmospheric pressure. Treating the technique as an absolute method and assuming a known sample heat capacity, the thermal conductivity of air has been measured at room temperature to within 11% of a reference value. Practical application of the method may require a calibrated effective wire length and wire diameter. An average wire temperature rise of around 10 K to ensure the three-omega components is enough for accurate measurement.

引用

页码：146 / 158

页数：13

共 12 条

[11] End Effects in the Three-Omega Method to Measure Gas Thermal Conductivity [J].