A twin-fluid atomizer configuration is predicted by means of the 2D weakly-compressible Smooth Particle Hydrodynamics (SPH) method and compared to experiments. The setup consists of an axial liquid jet fragmented by a co-flowing high-speed air stream (Ug ≈ 60 m/s) in a pressurized atmosphere up to 11 bar (abs.). Two types of liquid are investigated: a viscous Newtonian liquid (μl = 200 mPas) obtained with a glycerol/water mixture and a viscous non-Newtonian liquid (μl, apparent. ≈ 150 mPas) obtained with a carboxymethyl cellulose (CMC) solution. 3D effects are taken into account in the 2D code by introducing (i) a surface tension term, (ii) a cylindrical viscosity operator and (iii) a modified velocity accounting for the divergence of the volume in the radial direction. The numerical results at high pressure show a good qualitative agreement with experiment, i.e. a correct transition of the atomization regimes with regard to the pressure, and similar dynamics and length scales of the generated ligaments. The predicted frequency of the Kelvin-Helmholtz instability needs a correction factor of 2 to be globally well recovered with the Newtonian liquid. The simulation of the non-Newtonian liquid at high pressure shows a similar breakup regime with finer droplets compared to Newtonian liquids while the simulation at atmospheric pressure shows an apparent viscosity similar to the experiment.
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ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
June 26–30, 2017
Charlotte, North Carolina, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5083-1
PROCEEDINGS PAPER
SPH Simulation of an Air-Assisted Atomizer Operating at High Pressure: Influence of Non-Newtonian Effects
G. Chaussonnet,
G. Chaussonnet
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
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R. Koch,
R. Koch
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
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H.-J. Bauer,
H.-J. Bauer
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
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A. Sänger,
A. Sänger
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
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T. Jakobs,
T. Jakobs
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
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T. Kolb
T. Kolb
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
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G. Chaussonnet
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
R. Koch
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
H.-J. Bauer
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
A. Sänger
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
T. Jakobs
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
T. Kolb
Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany
Paper No:
GT2017-63033, V003T03A001; 12 pages
Published Online:
August 17, 2017
Citation
Chaussonnet, G, Koch, R, Bauer, H, Sänger, A, Jakobs, T, & Kolb, T. "SPH Simulation of an Air-Assisted Atomizer Operating at High Pressure: Influence of Non-Newtonian Effects." Proceedings of the ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. Volume 3: Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration Applications; Organic Rankine Cycle Power Systems. Charlotte, North Carolina, USA. June 26–30, 2017. V003T03A001. ASME. https://doi.org/10.1115/GT2017-63033
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