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

[+] Author and Article Information
Geoffroy Chaussonnet

Institut für Thermische Strömungsmaschinen, Karlsruher Institut für Technologie (KIT), Kaiserstr. 12, 76131 Karlsruhe, Germany
geoffroy.chaussonnet@kit.edu

Rainer Koch

Institut für Technische Chemie, Karlsruher Institut für Technologie (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
rainer.koch@kit.edu

Hans-Jörg Bauer

Institut für Technische Chemie, Karlsruher Institut für Technologie (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
hans-joerg.bauer@kit.edu

Alexander Sänger

Institut für Technische Chemie, Karlsruher Institut für Technologie (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
alexander.saenger@kit.edu

Tobias Jakobs

Institut für Technische Chemie, Karlsruher Institut für Technologie (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
tobias.jakobs@kit.edu

Thomas Kolb

Institut für Technische Chemie, Karlsruher Institut für Technologie (KIT), P.O. Box 3640, 76021 Karlsruhe, Germany
thomas.kolb@kit.edu

1Corresponding author.

ASME doi:10.1115/1.4038753 History: Received August 07, 2017; Revised November 09, 2017

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 reactor up to 11 bar (abs.). Two types of liquid are investigated: a viscous Newtonian liquid (µl = 200 mPa s) obtained with a glycerol/water mixture and a viscous non-Newtonian liquid (µl,apparent ~ 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 propagation velocity of the Kelvin-Helmholtz instability is well predicted, and its frequency needs a correction factor to be globally well recovered with the Newtonian liquid. The Sauter Mean Diameter, calculated from the spray size distribution shows similar trends versus the reactor pressure. The simulation of the non-Newtonian liquid at high pressure shows the same breakup regime with finer droplets compared to Newtonian liquids while the simulation at atmospheric pressure shows an apparent viscosity similar to the experiment.

Copyright (c) 2017 by ASME
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