Two alternative methods to evaluate thermophysical properties (heat capacity and hemispherical total emissivity) directly from the experimental data in pulse-heating experiments without the need to compute explicitly the heating and cooling rates are presented. The methods can be applied to a set of data originating from different experiments, providing with a single computation an estimate of the thermophysical property as a function of temperature. The first method is based on an integration of the basic equations of the pulse technique. In the second method a stochastic approach (the Kalman filter) is applied to the set of experimental data. The mathematical formulation of these computational methods is presented and the methods are intercompared by the use of a 'set of experimental measurements on niobium in the temperature range 1200-2600 K.
Computational Methods for the Determination of Thermophysical Properties in Pulse-Heating Experiments
SCARPA, FEDERICO
1997-01-01
Abstract
Two alternative methods to evaluate thermophysical properties (heat capacity and hemispherical total emissivity) directly from the experimental data in pulse-heating experiments without the need to compute explicitly the heating and cooling rates are presented. The methods can be applied to a set of data originating from different experiments, providing with a single computation an estimate of the thermophysical property as a function of temperature. The first method is based on an integration of the basic equations of the pulse technique. In the second method a stochastic approach (the Kalman filter) is applied to the set of experimental data. The mathematical formulation of these computational methods is presented and the methods are intercompared by the use of a 'set of experimental measurements on niobium in the temperature range 1200-2600 K.
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