Dependence of the Density of Entropy Production on the Rate of Changes in Temperature in the Linear Mode of Thermodynamics on the Examples of Graphite and Aluminum and Boron Nitrides

Abstract

We analyze the experimental thermograms of specimens in the form of plates of aluminum and boron nitrides heated by a laser and a freely cooled graphite sphere. It is shown that all thermograms can be referred to the linear law of thermodynamics. The linear dependence of density of the entropy production on the rate of changes in temperature is established. It is proposed to consider the rate dT/dτ as an additional variable for the density of entropy production in the linear thermodynamic law and apply this rate for the representation of the properties determined in the nonstationary thermal mode.