Sound velocity and isentropic exponents of real air on its compressibility chart

Kouremenos, DA; Antonopoulos, KA

dc.contributor.author	Kouremenos, DA	en
dc.contributor.author	Antonopoulos, KA	en
dc.date.accessioned	2014-03-01T01:08:33Z
dc.date.available	2014-03-01T01:08:33Z
dc.date.issued	1991	en
dc.identifier.issn	0142-727X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10562
dc.subject	compressibility chart	en
dc.subject	isentropic exponents	en
dc.subject	real air	en
dc.subject	sound velocity	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Acoustic Variables Measurement--Calculations	en
dc.subject.other	Isentropic Flow	en
dc.subject.other	Real Gas	en
dc.subject.other	Sound Velocity	en
dc.subject.other	Air	en
dc.title	Sound velocity and isentropic exponents of real air on its compressibility chart	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0142-727X(91)90040-3	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0142-727X(91)90040-3	en
heal.language	English	en
heal.publicationDate	1991	en
heal.abstract	In previous publications, three real-gas isentropic exponents k(pv), k(Tv), and k(pT) have been introduced, which, when used instead of the classical exponent k = C(p)/C(v) in the ideal-gas isentropic-change equations, may be applied with great accuracy to real gases. The first of the exponents may also be employed for calculating the real-gas sound velocity as alpha = (k(pv)pv)1/2. The purpose of this study is to present the generalized compressibility chart (of the Nelson-Obert type) of real air and place on this chart the values of the real-air isentropic exponents and sound velocity based on its virial equation of state. The usefulness of such diagrams lies in the fact that they provide in a compact and concise form information about the thermodynamic behavior and the isentropic flow of real air, and they allow straightforward comparisons between air and other real gases. Using the Redlich-Kwong-Soave correlation with acentric factor omega = 0.035, similar diagrams for the air are presented and compared successfully with the corresponding exact ones.	en
heal.publisher	BUTTERWORTH-HEINEMANN	en
heal.journalName	International Journal of Heat and Fluid Flow	en
dc.identifier.doi	10.1016/0142-727X(91)90040-3	en
dc.identifier.isi	ISI:A1991FV14500006	en
dc.identifier.volume	12	en
dc.identifier.issue	2	en
dc.identifier.spage	137	en
dc.identifier.epage	141	en