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Three-dimensional SPH simulation of a twin-fluid atomizer operating at high pressure [in press]

Chaussonnet, Geoffroy; Braun, Samuel; Dauch, Thilo; Keller, Marc; Kaden, Johannes; Jakobs, Tobias; Schwitzke, Corina; Koch, Rainer; Bauer, Hans-Joerg


In the context of biofuel production, a twin-fluid atomizer is investigated by the means of the Weakly-Compressible Smoothed Particle Hydrodynamics (WCSPH) method.
This configuration consists of a round liquid jet discharging at low velocity into a quiescent cavity. The liquid is atomized by a high-speed turbulent co-flow. This configuration has been studied experimentally as well. In order to reflect the experimental conditions, the liquid is a mixture of Glycerol and water and a constant viscosity is set to 200 mPa s. The ambient pressure is 11 bar and the gas velocity is 58.3 m/s, leading to a gas Reynolds number of 137 000 and a Weber number of 1375.
The three-dimensional numerical domain consists of the twin-fluid nozzle and a cavity of 30 mm length and 17.4 mm diameter. The spatial resolution is 33 \textmu m, which leads to 208 million of particles. The simulation is run for 45 ms of physical time using 2000 CPU.
The results show that the fiber-mode breakup is well captured by the method. The shape and the dynamics of the fragmented liquid lumps are in very good qualitative agreement with the experimental observations. Further quantitative analyses are performed in terms of time average of the liquid phase, and time evolution of the spray characteristics at the exit of the cavity. ... mehr

Postprint §
DOI: 10.5445/IR/1000084437
Veröffentlicht am 02.08.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie (ITC)
Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2018
Sprache Englisch
Identifikator urn:nbn:de:swb:90-844370
KITopen-ID: 1000084437
HGF-Programm 34.14.02 (POF III, LK 01) Vergasung
Erschienen in Proceedings of the 14th International Conference on Liquid Atomization & Spray Systems (ICLASS2018), Chicago, IL, July 22-26, 2018
Vorab online veröffentlicht am 01.08.2018
Schlagwörter air-assisted atomization, smoothed particle hydrodynamics, spray characteristics, fragmentation spectrum
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