Živić, Marija and Galović, Antun (2014) Entropijska produkcija pri stacionarnom provodenju topline kroz stijenku cilindra s toplinskim izvorom. = Entropy generation in steady heat conduction through a cylinder wall with internal heat generation. Tehnički vjesnik : znanstveno-stručni časopis tehničkih fakulteta Sveučilišta u Osijeku, 21 (5). pp. 1103-1108. ISSN 1330-3651. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q4 (2015). Točan broj autora: 2.
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Abstract (Croatian)
U radu je detaljno analiziran problem minimizacije entropijske produkcije za model stacionarnog provođenja topline u stijenci cilindra s toplinskim izvorom i nametnutim izotermnim rubnim uvjetima. Problem je riješen uvođenjem relevantnih bezdimenzijskih varijabli: bezdimenzijske izdašnosti toplinskog izvora, omjera vanjskog i unutrašnjeg polumjera cilindra, kao i omjera rubnih temperatura. Pomoću tih veličina i bezdimenzijskog polumjera izvedeni su analitički izrazi za temperaturno polje, te lokalnu i ukupnu entropijsku produkciju te je postavljen kriterij za postojanje minimuma entropijske produkcije. Rezultati provedene analize su obrazloženi te je prikazano područje vrijednosti omjera polumjera cilindra, te omjera rubnih temperatura, za određene vrijednosti izdašnosti toplinskog izvora, u kojem postoji minimum entropijske produkcije.
Abstract
Minimization of the entropy generation in steady heat conduction through a cylinder wall with an internal heat generation and isothermal boundary conditions is considered in a detail. The problem is solved analytically by introducing the relevant dimensionless variables: the dimensionless rate of internal heat generation, the ratio of the outside to the inside radius, and the ratio of the boundary temperatures. By means of these values and the dimensionless radius, the analytical expressions for the temperature distribution, and the local and total entropy generation are derived. A necessary condition for the existence of a minimum of the entropy generation is presented and the results of the analysis are explained. The field of the values of the ratio of the outside to the inside radius and the ratio of the boundary temperatures, for certain values of the internal heat generation, in which minimum of the entropy generation exists is presented.
| Item Type: | Article (["eprint_fieldopt_article_type_article" not defined]) |
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| Keywords (Croatian): | entropy generation, cylinder wall, internal heat generation, isothermal boundary conditions |
| Subjects: | TECHNICAL SCIENCE > Mechanical Engineering |
| Divisions: | 300 Department of Thermodynamics, Thermal and Process Engineering > 310 Chair of Technical Thermodynamics |
| Indexed in Web of Science: | Yes |
| Indexed in Current Contents: | No |
| Quartiles: | Q4 (2015) |
| Citations SCOPUS: | 0 (02.02.2017.) |
| Date Deposited: | 25 Apr 2016 07:49 |
| Last Modified: | 02 Feb 2017 13:59 |
| URI: | http://repozitorij.fsb.hr/id/eprint/5759 |
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