The three isentropic exponents of dry steam

Kouremenos, DA; Kakatsios, XK

dc.contributor.author	Kouremenos, DA	en
dc.contributor.author	Kakatsios, XK	en
dc.date.accessioned	2014-03-01T01:06:29Z
dc.date.available	2014-03-01T01:06:29Z
dc.date.issued	1985	en
dc.identifier.issn	0015-7899	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9416
dc.subject	Specific Heat	en
dc.subject.classification	Engineering, Multidisciplinary	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.other	GAS DYNAMICS	en
dc.subject.other	STEAM TABLES AND CHARTS	en
dc.subject.other	DRM STEAM	en
dc.subject.other	ISENTROPIC EXPONENTS	en
dc.subject.other	STEAM	en
dc.title	The three isentropic exponents of dry steam	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/BF02558416	en
heal.identifier.secondary	http://dx.doi.org/10.1007/BF02558416	en
heal.language	English	en
heal.publicationDate	1985	en
heal.abstract	The isentropic change of an ideal gas is described by the well known relations pvk=const, Tv(k-1) =const and p(1-k)Tk=const, where the exponent k is defined as the ratio of the constant pressure to the constant volume specific heat, k=cp/cv. The same relations are also used for real gases if small or differential isentropic changes are considered. A better examination of the differential isentropic change shows that for p, v, T systems, there are three different isentropic exponents corresponding to each pair formed out of the variables p, v, T. These three exponents noted kT,p, kT,v, kp,v after the corresponding pair of variables used, are interconnected by one relation, and accordingly only two out of the three are independent. The analysis of the present paper leads to the conclusion that calculations encountered in real gas isentropic change, with the exponent k taken as the ratio of the local specific heat values may lead to incorrect results. The numerical values of these exponents for steam, have been calculated and are presented. It can be seen that the deviations obtained, in comparison to the use of conventional k=cp/cv values are considerable. © 1985 VDI-Verlag GmbH.	en
heal.publisher	Springer-Verlag	en
heal.journalName	Forschung im Ingenieurwesen	en
dc.identifier.doi	10.1007/BF02558416	en
dc.identifier.isi	ISI:A1985APY5200005	en
dc.identifier.volume	51	en
dc.identifier.issue	4	en
dc.identifier.spage	117	en
dc.identifier.epage	122	en