Termodinâmica e propriedades termofísicas: vol.1 termodinâmica das fases

Lobo, Lélio Quaresma; Ferreira, Abel Gomes Martins

doi:10.14195/978-989-26-0487-9

Cited by 3 publications

(2 citation statements)

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“…This equation can be easily derived from first principles and classical thermodynamics equations (e.g. Lobo & Ferreira 2006). The Helmholtz free energy is generally used in statistical thermodynamics to express EoS, since most properties of interest can be obtained by proper differentiation of it.…”

Section: Estimation Of the Speed Of Sound In A Ternary Mixture Of Nit...mentioning

confidence: 99%

How speed-of-sound measurements could bring constraints on the composition of Titan's seas

Cordier¹

2016

Mon. Not. R. Astron. Soc.

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The hydrocarbons seas of Titan, discovered by Cassini/Huygens mission are among the most mysterious and interesting features of this moon. In the future, a possible dedicated planetary probe, will certainly measure the speed of sound in this cryogenic liquid, as it was planned in the case of a Huygens landing into a sea. Previous theoretical studies of such acoustic measurements were based on rather simple models, leading in some cases to unphysical situations. Employed in a vast body of chemical engineering works, the state of the art PC-SAFT model has been recently introduced in studies aimed at Titan. Here, I revisit the issue of the speed of sound in Titan's liquids, in the light of this theory. I describe, in detail, the derivation of the speed of sound from the chosen equation of state and the potential limitations of the approach. To make estimations of the composition of a ternary liquid mixture N 2 :CH 4 :C 2 H 6 from speed of sound measurements an original inversion algorithm is proposed. It is shown that 50 measures between 90 K and 100 K are enough to ensure an accuracy of the derived compositions better than 10%. The influence of the possible presence of propane is also investigated.

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Section: Estimation Of the Speed Of Sound In A Ternary Mixture Of Nit...mentioning

confidence: 99%

How speed-of-sound measurements could bring constraints on the composition of Titan's seas

Cordier¹

2016

Mon. Not. R. Astron. Soc.

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“…Regarding VLE of mixtures, homogeneous and heterogeneous methods can be used. The former are based on the VDW EoS family and the second use the UNIFAC method to predict liquid coefficient activities( γ i ) and the virial equation to calculate the coefficient fugacities( ϕ i ) of the gaseous phase 16. The VLE simulator carries out calculations of BUBL P , BUBL T , DEW P , DEW T , and isothermal flash for mixtures from a database with 25 substances which includes hydrocarbons, alcohols and water, at the moment.…”

Section: Description Of the Area Unit Operations And Separation Procementioning

confidence: 99%

A virtual platform to teach separation processes

Granjo¹,

Rasteiro²,

Gando-Ferreira³

et al. 2012

Comp Applic In Engineering

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In this article the Unit Operations and Separation Processes area of a virtual platform called LABVIRTUAL (http://labvirtual.eq.uc.pt) is presented aiming to support the autonomous study of undergraduate students engaged in a Chemical Engineering degree, especially in Portuguese-speaking countries. The main features, subjects, computational applications, and examples in the platform are described, as well as a first assessment by the students. ß

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