Entropy generation and exergy efficiency in adiabatic mixing of nitrogen and oxygen streams of different temperatures and environmental pressures

Galović, Antun and Ferdelji, Nenad and Mudrinić, Saša (2010) Entropy generation and exergy efficiency in adiabatic mixing of nitrogen and oxygen streams of different temperatures and environmental pressures. = Entropy generation and exergy efficiency in adiabatic mixing of nitrogen and oxygen streams of different temperatures and environmental pressures. Strojniški Vestnik/Journal of Mechanical Engineering, 56 (12). pp. 817-822. ISSN 0039-2480. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q3 (2010). Točan broj autora: 3.

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Abstract

The paper presents a non-dimensional model of entropy generation and exergy efficiency in the adiabatic mixing of a nitrogen stream and oxygen stream with different temperatures and environmental pressure. The resulting mixture has the same, i.e. environmental, pressure. Non-dimensional variables in the model represent the ratio of thermodynamic stream temperatures u, the ratio between the thermodynamic temperature of one stream and the environmental temperature u1, and the mole fraction y1 of one of the streams. The model comprises irreversibility due to different temperatures of streams because of the mixing of different gases, while exergies of streams also comprise their mole fractions in the ambient air (atmosphere). In this respect, the model takes the standard values of mole fractions of oxygen and nitrogen of yO2 = 0.21 and yN2 = 0.79. The values of stream mole fractions at which maximum values of entropy generation and minimum values of exergy efficiencies occur are given. Calculation results are given in respective diagrams. © 2010 Journal of Mechanical Engineering. All rights reserved.

Item Type:	Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian):	Ambient air; Analytic models; Entropy generation; Environmental pressures; Environmental temperature; Exergy efficiencies; Exergy efficiency; Maximum values; Minimum value; Mole fraction; Non-dimensional models; Non-dimensional variable; Standard values; Stream temperatures; Thermodynamic temperature; Entropy; Exergy; Hydraulics; Mixing; Nitrogen; Oxygen; Atmospheric temperature
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:	Q3 (2010)
Citations SCOPUS:	1 (01.02.2017.)
Date Deposited:	17 Apr 2015 08:00
Last Modified:	01 Feb 2017 09:32
URI:	http://repozitorij.fsb.hr/id/eprint/3581

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