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Further examination of the transient hot-wire method for the simultaneous measurement of thermal conductivity and thermal diffusivity
| Content Provider | Scilit |
|---|---|
| Author | Watanabe, H. |
| Copyright Year | 2002 |
| Description | Journal: Metrologia The transient hot-wire technique is re-investigated in order to measure, simultaneously and accurately, the thermal conductivity λ and thermal diffusivity κ of a liquid. Newly derived effective temperatures $T_{λ}$ and $T_{κ}$ that are associated with the measured values of the thermal conductivity and thermal diffusivity are introduced and replace the previously used temperatures $T_{0}$ and $T_{m}$. Higher-order corrections due to the thermal properties of the wire material are also re-investigated; these may be significant for experiments on lower-density substances or when using a hot-wire sensor with a thicker wire. The radiation (photons) emitted from or absorbed into the medium is discussed, and its contribution is taken to be part of the ordinary heat-conduction phenomenon exhibited by carriers such as phonons, electrons and molecules. The new system was tested by measuring the thermal conductivity and thermal diffusivity of n-heptane, n-pentane and iso-pentane, and values for their volumic heat capacities were calculated from the ratios λ/κ. The relative combined expanded uncertainties of the measured values (coverage factor k = 2) were 0.38 % for λ, and 1.7 % for κ and $c_{p}$ρ. |
| Related Links | http://iopscience.iop.org/article/10.1088/0026-1394/39/1/9/pdf |
| Ending Page | 81 |
| Page Count | 17 |
| Starting Page | 65 |
| ISSN | 00261394 |
| e-ISSN | 16817575 |
| DOI | 10.1088/0026-1394/39/1/9 |
| Journal | Metrologia |
| Issue Number | 1 |
| Volume Number | 39 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2002-02-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Metrologia Nuclear Energy and Engineering Thermal Diffusivity Thermal Conductivity |
| Content Type | Text |
| Resource Type | Article |
| Subject | Engineering |
