Entropy production in ac-calorimetry

Details Entropy production in ac-calorimetry Entropy production in ac-calorimetry

2007-06-28

arxiv.org/abs/0706.4216v1

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

In calorimetry and particularly in heat capacity measurements, different characteristic relaxation time constants may perturb the experiment which cannot be considered at thermodynamic equilibrium. In this case, thermodynamics of irreversible processes has to be taken into account and the calorimetric measurements must be considered as dynamic. In a temperature modulated experiment, such as ac-calorimetry, these non-equilibrium experiments give rise to the notion of frequency dependent complex heat capacity. In this paper, it is shown that for each irreversible process an experimental frequency dependent complex heat capacity can be inferred. Furthermore, we demonstrate rigorously that a same equality connects the imaginary part of these different complex heat capacities with the entropy produced during these irreversible processes. Finally, we claim that the presence of an imaginary part in the measured heat capacity always indicates that a certain amount of heat does not participate to the classical equilibrium heat capacity of the sample when measured over the observation time scale.

Affiliated with

Also associated with

No associations

Rating

Entropy production in ac-calorimetry does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Entropy production in ac-calorimetry, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Entropy production in ac-calorimetry will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-456609