Numerical method for simulating high pressure CO2 flows with nonequilibrium condensation

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)


A numerical method for compressible flows withnonequilibrium condensation is reconstructed for simulatingsupercritical CO2 flows with nonequilibrium condensationunder high pressure conditions. Thermophysical propertiesare interpolated from pressure-temperature look-up tables anddensity-internal energy look-up tables, which are generatedusing the polynomial equations in REFPROP. We employ thehigh pressure nonequilibrium condensation model in which thecritical radius of a liquid droplet is modified by consideringnon-ideal gas. We simulate high pressure CO2 flows through aLaval nozzle, which was experimentally investigated byLettieri et al. High-pressure CO2 passes through the nozzle,leading to a decrease in its pressure and temperature. It reachesthe supercooled condition near the throat. Nucleation and thesubsequent growth of droplets lead to an increase in thecondensate mass fraction in the diverging area. The proposedmethod for real gas reproduced the peak of pressuredistribution owing to the release of latent heat, whereas thenumerical result assuming ideal gas is different from theexperimental result. The nucleation region obtained using thepresent method is earlier and narrower than that in the case ofideal gas. The early and rapid nucleation leads to the high masscondensate rate at the outlet. These results show thatconsidering the real gas effect and nonequilibriumcondensation is crucial for developing the impeller of acompressor for the supercritical CO2 Brayton cycle.

Original languageEnglish
Title of host publicationOil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Print)9780791851180
Publication statusPublished - 2018 Jan 1
EventASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018 - Oslo, Norway
Duration: 2018 Jun 112018 Jun 15

Publication series

NameProceedings of the ASME Turbo Expo


OtherASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition, GT 2018

ASJC Scopus subject areas

  • Engineering(all)

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