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SPH Simulation of an Air-Assisted Atomizer Operating at High Pressure : Influence of Non-Newtonian Effects

Chaussonnet, Geoffroy; Koch, Rainer; Bauer, Hans-Jörg; Saenger, Alexander; Jakobs, Tobias; Kolb, Thomas

Abstract:
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 (µ = 200 mPa.s) obtained with a glycerol/water mixture and a viscous non-Newtonian liquid (µ ~ 150 mPa.s) 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 l ... mehr


Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie (ITC)
Institut für Thermische Strömungsmaschinen (ITS)
Publikationstyp Proceedingsbeitrag
Jahr 2017
Sprache Englisch
Identifikator KITopen ID: 1000071110
HGF-Programm 34.14.02; LK 01
Erschienen in Proceedings of ASME Turbo Expo 2017 : Turbomachinery Technical Conference & Exposition, Charlotte, USA, 26-30 June 2017
Seiten Art.Nr. GT2017-63033
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