Publicou 12 edições por ano
ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684
Indexed in
A GIBBS ENERGY RELAXATION (GERM) MODEL FOR CAVITATION SIMULATION
RESUMO
In this paper, a comprehensive highly compressible and turbulent two-fluid multispecies model is presented. It involves an equation for the transport of the liquid volume fraction in addition to two different sets of partial differential equations for the gas and the liquid phase. The multicomponent gas phase is governed by an ideal gas equation of state (EOS) while the stiffened gas EOS is specified to the single-component liquid phase. In this work, a Reynolds averaged Navier-Stokes (RANS) formulation is adopted. For the turbulence, a standard k − ε model is used for the gas phase while a turbulent viscosity-based model is used for the liquid phase in order to improve the laminar-turbulent transition computation through the nozzle. In addition, the model equations include different relaxation terms for mass, momentum, and energy exchanges at the liquid-gas interfaces. For the present cavitation modeling, an instantaneous relaxation procedure is used for the velocity, pressure, and temperature; while a slower procedure is adopted for the Gibbs free-energy relaxation model (GERM) at the interfaces. These models have been applied for the simulation of the cavitation inside a transparent single-hole nozzle. The obtained cavitation pocket has a similar shape as the experiments. Moreover, two different cavitation regimes have been identified. A gaseous cavitation regime appears in a region in which the static pressure is close to but above the liquid saturation pressure; a second cavitation regime may happen when the static pressure goes below the liquid saturation pressure. In the latter case, the liquid become superheated and leads to a vaporous cavitation regime. Also, the cooling of the fuel and the density variation due to the expansion of compressible liquid through the nozzle is among the more interesting findings of this paper.
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Battistoni Michele, Xue Qingluan, Som Sibendu, Large-Eddy Simulation (LES) of Spray Transients: Start and End of Injection Phenomena, Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles, 71, 1, 2016. Crossref
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Habchi Chawki, Bohbot Julien, Schmid Andreas, Herrmann Kai, A comprehensive Two-Fluid Model for Cavitation and Primary Atomization Modelling of liquid jets - Application to a large marine Diesel injector, Journal of Physics: Conference Series, 656, 2015. Crossref
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Bode Mathis, Falkenstein Tobias, Davidovic Marco, Pitsch Heinz, Taniguchi Hiroyoshi, Murayama Kei, Arima Toshiyuki, Moon Seoksu, Wang Jin, Arioka Akira, Effects of Cavitation and Hydraulic Flip in 3-Hole GDI Injectors, SAE International Journal of Fuels and Lubricants, 10, 2, 2017. Crossref
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Rachakonda Sampath K., Wang Yue, Grover Ronald O., Moulai Maryam, Baldwin Eli, Zhang Gaoming, Parrish Scott, Diwakar Ramachandra, Kuo Tang-Wei, Schmidt David P., A computational approach to predict external spray characteristics for flashing and cavitating nozzles, International Journal of Multiphase Flow, 106, 2018. Crossref
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Yi Ping, Yang Songzhi, Habchi Chaouki, Lugo Rafael, A multicomponent real-fluid fully compressible four-equation model for two-phase flow with phase change, Physics of Fluids, 31, 2, 2019. Crossref
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Yang Songzhi, Yi Ping, Habchi Chaouki, Real-fluid injection modeling and LES simulation of the ECN Spray A injector using a fully compressible two-phase flow approach, International Journal of Multiphase Flow, 122, 2020. Crossref
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Habchi Chaouki, Real-fluid phase transition in cavitation modeling considering dissolved non-condensable gas, Physics of Fluids, 32, 3, 2020. Crossref
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Gaballa Hesham, Jafari Sajad, Habchi Chaouki, de Hemptinne Jean-Charles, Numerical investigation of droplet evaporation in high-pressure dual-fuel conditions using a tabulated real-fluid model, International Journal of Heat and Mass Transfer, 189, 2022. Crossref
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Szewczak Andrzej, Łagód Grzegorz, Zaburko Jacek, Pavlik Zbyšek, Influence of cavitation on changes in the viscosity of epoxy resins used in composite materials production, Thermophysics 2021: 26th International Meeting of Thermophysics 2021, 2488, 2022. Crossref
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Wloka Johann, Klaua Thomas, Weber Armin, Kern Stefan, Hauschild André, Wagner Wolfgang, Maier Ludwig, Continuous development of common rail injection technology for medium-speed 4-stroke diesel engines, in Heavy-Duty-, On- und Off-Highway-Motoren 2015, 2018. Crossref
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Szewczak Andrzej, Łagód Grzegorz, Adhesion of Modified Epoxy Resin to a Concrete Surface, Materials, 15, 24, 2022. Crossref