A modified Angstrom’s method for the measurement of the thermal diffusivity of solid materials is presented, aimed at overcoming the limits of ordinary one-side techniques. The method requires a periodic thermal input, alternating heating and cooling stages, to be supplied to the specimen. The thermal diffusivity is estimated by monitoring the temperature oscillations on the free surface of the specimen.The conditions for which a real three-dimensional test-system can be studied by means of a one-dimensional thermal model are investigated by analytical and numerical methods. The algorithms for the estimate of thermal diffusivity are determined for the one-dimensional thermal system and are verified by numerical simulation. The applicability of the algorithms to multi-dimensional configurations is finally explored.
Numerical investigation of a one-side measurement technique for thermal diffusivity / Barozzi, Giovanni Sebastiano; Corticelli, Mauro Alessandro; Muscio, Alberto; Tartarini, Paolo. - STAMPA. - I:(1999), pp. 421-434. (Intervento presentato al convegno XVII Congresso Nazionale sulla Trasmissione del Calore tenutosi a ferrara nel 30 giugno-2 luglio 1999).
Numerical investigation of a one-side measurement technique for thermal diffusivity
BAROZZI, Giovanni Sebastiano;CORTICELLI, Mauro Alessandro;MUSCIO, Alberto;TARTARINI, Paolo
1999
Abstract
A modified Angstrom’s method for the measurement of the thermal diffusivity of solid materials is presented, aimed at overcoming the limits of ordinary one-side techniques. The method requires a periodic thermal input, alternating heating and cooling stages, to be supplied to the specimen. The thermal diffusivity is estimated by monitoring the temperature oscillations on the free surface of the specimen.The conditions for which a real three-dimensional test-system can be studied by means of a one-dimensional thermal model are investigated by analytical and numerical methods. The algorithms for the estimate of thermal diffusivity are determined for the one-dimensional thermal system and are verified by numerical simulation. The applicability of the algorithms to multi-dimensional configurations is finally explored.
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