Solutions Scientific and Technical Solutions Optimization ... · SiCo–Solutions 3 Examples of...
Transcript of Solutions Scientific and Technical Solutions Optimization ... · SiCo–Solutions 3 Examples of...
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Optimization of an Extrusion Process for
Non-Newtonian high-viscous Fluids with
Wall Slip and Shear Thinning Effect
Wolfgang Hoffmann, Monika Scholz
SiCo-Solutions, Stuttgart, Germany
COMSOL Conference, Rotterdam, October 2013
SiCo – Solutions Scientific and Technical Solutions
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SiCo–Solutions
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Agenda: Visco-plastic materials
Measurement of material parameters
Simulation of the flow in a forming die
Conclusions
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SiCo–Solutions
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Examples of visco-plastic materials Silly putty
Heavy clay
Technical ceramics
Noodles, ketchup, food
Aluminum
Blood
Plastics
Rubber
Polymers
.....................
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SiCo–Solutions Viscoplastic Materials
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Heavy clay industry
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SiCo–Solutions Technical Ceramics
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SiCo–Solutions Die with pressure head
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Pressure sensor
strainer
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SiCo–Solutions Characteristics of fluids
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Bingham-Fluid: yield stress
FF ,
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SiCo–Solutions Wall slip
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HG
y
x
Low viscosity lubricating film
G
G
H
U ),( WGW kuf
Non-segregated clay material
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SiCo–Solutions Material Parameters
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PSM developped for visco-plastic materials
4 characteristic parameters
expansion flow rheometer
kfactorwall
stressslipwall
osityvisBingham
stressyield
G
B
F
c
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SiCo–Solutions Laboratory
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Screw extruder
Piston extruder
Measurement of material parameters
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SiCo–Solutions Verifikation
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Reliabilty of the material modell, PSM
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SiCo–Solutions Forming device
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Die with pressure head and fluid volume
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SiCo–Solutions Velocity
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Velocity profile
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SiCo–Solutions Velocity
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Velocity profile
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SiCo–Solutions Pressure
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Pressure profile
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SiCo–Solutions Viscosity
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Viscosity profile
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SiCo–Solutions Shear rate
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Shear rate distribution
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SiCo–Solutions wall slip velocity
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Wall slip velocity
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SiCo–Solutions Conclsions
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Simulation of viscoplastic fluids needs wall slip computation for correct simulation Simulation and procedure technology is based on a Bingham modell with 4 parameters Determination of the characteristic material parameters including wall slip is possible with expansion flow rheometer COMSOL with extension PSM is an efficient tool for the analysis of the wide range of viscoplastic fluids