EnglishThe development of a novel approach to the well-known Angstrom´s method for the measurement of the thermal diffusivity is reported. In this method, the diffusivity is determined from the damping and the phase shift of a periodic thermal signal during its propagation along the specimen. The propagation can be easily monitored by infrared thermography. In general, a non-contact source is used to apply the signal. In the present work, however, a direct-contact source is employed, with a temperature-oscillation signal supplied on a portion of one of the two main surfaces of the specimen, where a homogeneous contact can be yielded by using a proper contact pressure. Such practice implies that the measures of surface temperature can be used to estimate the diffusivity only beyond a certain distance from the source, where the wave-front of the temperature oscillation within the specimen becomes plane and perpendicular to the main surfaces. This distance is investigated here, to establish a general rule for the performance of the experiments. A thermoelectric device based on the Peltier effect is employed as the thermal source. The main difficulty about its use is to obtain a perfectly harmonic and well-balanced thermal signal. This is necessary to avoid a complex processing of the experimental data, and it can be achieved by supplying a current with a properly-chosen time-evolution pattern. Such an approach, which is built upon previous work, is here enhanced by improving the underlying analytical model.
Thermal diffusivity measurement in slabs using harmonic and one-dimensional propagation of thermal waves / Muscio, Alberto; P. G., Bison; S., Marinetti; E., Grinzato. - In: INTERNATIONAL JOURNAL OF THERMAL SCIENCES. - ISSN 1290-0729. - STAMPA. - 43:5(2004), pp. 453-463.
| Data di pubblicazione: | 2004 |
| Titolo: | Thermal diffusivity measurement in slabs using harmonic and one-dimensional propagation of thermal waves |
| Autore/i: | Muscio, Alberto; P. G., Bison; S., Marinetti; E., Grinzato |
| Autore/i UNIMORE: | |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.1016/j.ijthermalsci.2003.10.005 |
| Rivista: | |
| Volume: | 43 |
| Fascicolo: | 5 |
| Pagina iniziale: | 453 |
| Pagina finale: | 463 |
| Codice identificativo ISI: | WOS:000221386700003 |
| Codice identificativo Scopus: | 2-s2.0-2442495270 |
| Citazione: | Thermal diffusivity measurement in slabs using harmonic and one-dimensional propagation of thermal waves / Muscio, Alberto; P. G., Bison; S., Marinetti; E., Grinzato. - In: INTERNATIONAL JOURNAL OF THERMAL SCIENCES. - ISSN 1290-0729. - STAMPA. - 43:5(2004), pp. 453-463. |
| Tipologia | Articolo su rivista |
File in questo prodotto:
| File | Descrizione | Tipologia | |
|---|---|---|---|
| 2004-05_Int. J. of Thermal Sciences 43 (5) (2004) 453–463.pdf | Articolo pricnipale | Versione dell'editore (versione pubblicata) | Administrator Richiedi una copia |
http://hdl.handle.net/11380/306751
I documenti presenti in Iris Unimore sono rilasciati con licenza Creative Commons Attribuzione - Non commerciale - Non opere derivate 3.0 Italia, salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris
Copyright © 2020