Author(s):
1. Mitar Perušić, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
2. Branko Pejović, Republic of Srpska, Bosnia and Herzegovina
3. Mirko Radic, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
4. Radislav Filipovic, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
5. Zoran Obrenovic, Faculty of Technology - University of East Sarajevo, Republic of Srpska, Bosnia and Herzegovina
6. Dragiša Đorđić, Alumina doo, , Republic of Srpska, Bosnia and Herzegovina

Abstract:
Starting from the fact that changes of specific entropy of semi-perfect gas can not be determined using the medium specific heat capacity as other thermodynamic properties, the paper proposed one suitable approximate logarithmic function, also it is possible to apply and other relevant functions. The function is determined by mathematical transformation and application of differential calculation and the computer program. It allows the determination of changes of entropy for arbitrary temperature interval. Verification of the suggested method is provided for carbon-dioxide semi perfect gas, but in the context of wide analysis verified for a particular group of semi-perfect gases, and results were compared with the classical integral method. Based on the proposed, it is possible to solve problems in technical practice in a more efficient manner.

Key words:
Entropy, logarithmic function, semi-perfect gas.

Thematic field:
SYMPOSIUM A - Science of matter, condensed matter and physics of solid states

Date of abstract submission:
20.05.2015.

Conference:
Contemporary Materials 2015 - Savremeni Materijali

Final paper