Analysis and Optimization of Paper Machine Clothings by Computer Simulation Dr. Stefan Rief Fraunhofer Institute for Industrial Mathematics (ITWM) Kaiserslautern, Germany Papermaking Research Symposium 2009 Papermaking Research Symposium 2009 Papermaking Research Symposium 2009 Papermaking Research Symposium 2009 Department of Physics, University of Kuopio June 2, 2009 Finland
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Analysis and Optimization of Paper Machine Clothings by Computer Simulation
Dr. Stefan Rief
Fraunhofer Institute for Industrial Mathematics (ITWM)
Kaiserslautern, Germany
Papermaking Research Symposium 2009Papermaking Research Symposium 2009Papermaking Research Symposium 2009Papermaking Research Symposium 2009
Simulation of Pore Size DistributionsSimulation of Pore Size DistributionsSimulation of Pore Size DistributionsSimulation of Pore Size Distributions
Seite 14
Structure Characterization
Maximum Through PoreMaximum Through PoreMaximum Through PoreMaximum Through Pore
2coscp
r
σβ=
YoungYoungYoungYoung----Laplace EquationLaplace EquationLaplace EquationLaplace Equation Bubble PointBubble PointBubble PointBubble Point
Seite 15
Structure Characterization
Flow Solver is based on NavierFlow Solver is based on NavierFlow Solver is based on NavierFlow Solver is based on Navier----StokesStokesStokesStokes----BrinkmannBrinkmannBrinkmannBrinkmann equationsequationsequationsequations
Henry Darcy (1803-1858)
Seite 16
Structure Characterization
Darcy's law: K p
Qlµ
∆= ⋅
∆
Air / Water PermeabilityAir / Water PermeabilityAir / Water PermeabilityAir / Water Permeability
Seite 17
Structure Characterization
Seite 18
Paper Forming
R. Rundqvist: Microstructure simulations of early paperforming (PRS 2009)
Seite 19
Press Nip Simulation
Paper MachinePaper MachinePaper MachinePaper Machine Press SectionPress SectionPress SectionPress Section
100µm
10m
TomographyTomographyTomographyTomography
30 cm
Seite 20
Press Nip Simulation
Modeling and Simulation of the Pressing Section of a Paper Machine
GeoDict provides input parameters for macro simulations:
• Image processing (filters, cut-outs)
• Analysis of porosity distribution
• Computation of layer wise permeability
• Porosity and permeability variations under virtual compression
• Pressure-saturation curves by pore morphology method