Second law analysis of non-equilibrium fluid streams

Kouremenos, DA

dc.contributor.author	Kouremenos, DA	en
dc.date.accessioned	2014-03-01T01:07:20Z
dc.date.available	2014-03-01T01:07:20Z
dc.date.issued	1989	en
dc.identifier.issn	0015-7899	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9934
dc.subject	Binary Mixture	en
dc.subject	Equilibrium State	en
dc.subject	Heat and Mass Transfer	en
dc.subject	Heat Exchanger	en
dc.subject	Mass Transfer	en
dc.subject	Second Law	en
dc.subject	Thermodynamics	en
dc.subject.classification	Engineering, Multidisciplinary	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	Chemical Equipment--Condensers	en
dc.subject.other	Evaporators	en
dc.subject.other	Flow of Fluids	en
dc.subject.other	Heat Exchangers--Thermodynamics	en
dc.subject.other	Mass Transfer	en
dc.subject.other	Absorbers	en
dc.subject.other	Binary Mixture Streams	en
dc.subject.other	Dephlegmators	en
dc.subject.other	Resorbers	en
dc.subject.other	Second Law Analysis	en
dc.subject.other	Heat Transfer	en
dc.title	Second law analysis of non-equilibrium fluid streams	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF02559011	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF02559011	en
heal.language	German	en
heal.publicationDate	1989	en
heal.abstract	A methode for obtaining second law analysis, of heat and mass transfer unit operations between two fluid streams, is presented. For single phase heat exchangers, the heat exchanger temperature characteristic Th =Th (Tc ) is introduced where Th and Tc stands for the stream temperature of the hot and cold stream along the heat exchanging surface. If the two streams involve two-phase fluids, additional information is needed to define the vapour content and the existing deviations from the equilibrium. This can be given by the vapour/liquid ratio and the relevant fluid temperature characteristic Tv =Tv (Tl ) connecting the vapour and the liquid temperature of the corresponding phases of each stream. A non-equilibrium vapour-liquid mixture can be represented by its corresponding equilibrium state and a non-equilibrium-equilibrium deviation (NED) measured by the corresponding entropy difference. It is shown, how the two streams of the heat exchanger can be combined to form an equivalent single stream representing the behaviour of the heat exchanger. The same approach is extended further to include the mass transfer operations between two-phase binary mixture streams. In this case in addition to the temperature characteristic mentioned above, the mass fraction characteristic for the liquid-vapour coexisting phases are needed or, instead of that, the temperature characteristics of liquid and vapour as a function of the local equilibrium temperature. It is shown how the equivalent single stream can be obtained and the special cases of evaporator, absorber, rectificator, condenser and dephlegmator are considered in brief. Combination of such equivalent single streams, compose the description of complex thermodynamic cycles as for instance is the cycle of non-equilibrium absorption refrigeration. © 1989 VDI Verlag GmbH.	en
heal.publisher	Springer-Verlag	en
heal.journalName	Forschung im Ingenieurwesen	en
dc.identifier.doi	10.1007/BF02559011	en
dc.identifier.isi	ISI:A1989T121000003	en
dc.identifier.volume	55	en
dc.identifier.issue	1	en
dc.identifier.spage	10	en
dc.identifier.epage	15	en