Bibliographic Citation
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| Title | Thermal-conductivity measurement of a two-dimensional anisotropic heat conductor using steady-state point heat source and sink |
| Creator/Author | Nemoto, Eiji ; Kawashimo, Kensuke |
| Publication Date | 1995 Dec 31 |
| OSTI Identifier | OSTI ID: 451990 |
| Other Number(s) | Journal ID: HTJPAU; ISSN 0096-0802; TRN: TRN: IM9715%%22 |
| Resource Type | Journal Article |
| Resource Relation | Journal Name: Heat Transfer - Japanese Research; Journal Volume: 24; Journal Issue: 6; Other Information: PBD: 1995 |
| Subject | 36 MATERIALS SCIENCE; HIGH-TC SUPERCONDUCTORS; THERMAL CONDUCTIVITY; BARIUM OXIDES; COPPER OXIDES; YTTRIUM OXIDES; STEADY-STATE CONDITIONS; MEASURING METHODS |
| Description/Abstract | A new measuring method for the principal thermal conductivities of a two-dimensional anisotropic heat conductor using a steady-state point heat source and sink is proposed here. The theory of this new thermal-conductivity measurement is based on a congruent matrix transformation from the nonuniform space of an anisotropic heat conductor to the uniform space of an isotropic one. Introduction of the hypothesis of symmetry in the heat conduction law leads to an equivalent relationship of the thermal conductivity tensor between an anisotropic space tensor {Lambda}{sub {mu}} and a uniform space tensor {Lambda}{sub {nu}}. This new measuring method can provide the two principal thermal conductivities {lambda}{sub 1,2} and the principal rotation angle {phi} from the temperature detecting axis. The temperature dependence of two principal thermal conductivities {lambda}{sub 1,2} and the principal rotation angle {phi} of Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}y} have been measured. Anomalies of the two principal thermal conductivities and the principal rotation angle are clearly observed at the superconductivity transition temperature {Tc}. |
| Country of Publication | United States |
| Language | English |
| Format | Medium: X; Size: pp. 491-503 |
| System Entry Date | 2009 Dec 16 |
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