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Effect of humidity on the thermodynamic behaviour of atmospheric air

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dc.contributor.author Kouremenos, DA en
dc.contributor.author Kakatsios, XK en
dc.contributor.author Krikkis, RN en
dc.date.accessioned 2014-03-01T01:48:32Z
dc.date.available 2014-03-01T01:48:32Z
dc.date.issued 1999 en
dc.identifier.uri http://hdl.handle.net/123456789/25515
dc.relation.uri http://www.scopus.com/inward/record.url?eid=2-s2.0-0033300753&partnerID=40&md5=ab3e09b4c3f6df47139b08f5baa662e8 en
dc.subject.other Atmospheric density en
dc.subject.other Atmospheric humidity en
dc.subject.other Earth atmosphere en
dc.subject.other Pressure effects en
dc.subject.other Specific heat en
dc.subject.other Thermal effects en
dc.subject.other Atmospheric air en
dc.subject.other Mach number en
dc.subject.other Vapour liquid equilibrium en
dc.subject.other Thermodynamics en
dc.title Effect of humidity on the thermodynamic behaviour of atmospheric air en
heal.type journalArticle en
heal.publicationDate 1999 en
heal.abstract The present work considers the thermodynamic behaviour of moist air as a function of the state variables temperature, density and humidity ratio. Moist air is treated as an ideal mixture which is composed of two real gases, air and steam. The state functions of the mixture are expressed using the corresponding explicit relations of the two species from which the three isentropic exponents describing the real gas isentropic change are calculated. Saturated conditions are determined by solving the Vapour Liquid Equilibrium problem for real water. Numerical results show the effect of humidity as well as the effect of pressure on the thermodynamic behaviour of atmospheric air (such as the three isentropic exponents kpρ,kTp,kTρ, the classical isentropic exponent k and the velocity of sound) for a wide range of temperatures and pressures. Furthermore the isentropic change is approximated by explicit relations having mathematical forms similar to those of the ideal gas but with different constants and exponents. The obtained accuracy is remarkable, being better than 0.32%. In this way the isentropic change, of moist air can be computed by simple explicit relations having as independent variable the Mach number and the humidity ratio. The effects of humidity are examined on certain cases of practical interest such as the critical state (M = 1), the impulse function and the mass flow rate. en
heal.publisher ASME, Fairfield, NJ, United States en
heal.journalName American Society of Mechanical Engineers, Advanced Energy Systems Division (Publication) AES en
dc.identifier.volume 39 en
dc.identifier.spage 275 en
dc.identifier.epage 284 en


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