multiphase flow - chalmers · 2005. 5. 24. · multiphase flow projects at am, chalmers...
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Applied Mechanics Multiphase Flow
Multiphase Flow
Alf-Erik Almstedt
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Multiphase Flow Group:
Alf-Erik Almstedt, professor
Berend van Wachem, docent
Rasmus Hemph
Joakim Svensson (ind. PhD. stud.)
Vinay Gopala
Aldo Benavides
Andreas Mark
Stina Karlsson (KAT)
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Multiphase flow:
the simultaneous flow of gas,
liquid and/or solid phases in
different combinations
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Participants:
Chalmers
The Royal Institute of Technology (KTH)
Lund Institute of Technology (LTH)
Swedish Industry
SIAMUF: Swedish Industrial Association for
Multiphase Flows
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Target areas:
Chemical Processes
Paper and Pulp
Metallurgy
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Courses arranged by the Graduate School:
The theory of multiphase flow
The phenomenology of
multiphase flow
Experimental methods in
multiphase flow
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1. An experimental study of aerated stirred bio-
reactors. (LTH) FFFiiinnniiissshhheeeddd
2. Modeling of two-phase dense dispersed (bubbly) turbulent flow with application to aerated stirred
bioreactors. (LTH)
3. Fluidization for chemical and process technology. (Chalmers) FFFiiinnniiissshhheeeddd
4. Transport of particles in gas flow. (Chalmers)
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5. Modeling column packing for chromatography (Chalmers)
6. Modelling the rheological properties and
consolidation of suspensions. (KTH) FFFiiinnniiissshhheeeddd
7. Separation of pulp fibers in a centrifugal field with special application to a hydrocyclone. (KTH)
8. A novel metal spray-forming process. (KTH)
FFFiiinnniiissshhheeeddd
9. Numerical methods for dispersed two-phase flow equations of Eulerian type. (KTH) FFFiiinnniiissshhheeeddd
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1. An experimental study of aerated stirred bio-reactors. (LTH)
Simultaneous measurements of concentration, liquid and gas-bubble
velocities
Particle image velocimetry (PIV) Planar laser induced fluorescence (PLIF)
Test cases: bubbles in grid-generated turbulence
stirred aerated reactor
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2. Modeling of two-phase dense dispersed (bubbly) turbulent flow with application to
aerated stirred bioreactors. (LTH)
Large-Eddy Simulations (LES) Lagrangian tracking of bubbles
Effects of bubble volume fraction and size on flow field and scalar concentration field
Effects of scale-up
Comparisons with Eulerian calculations
Bubble deformation (VOF)
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3. Fluidization for chemical and process
technology. (Chalmers)
In collaboration with AstraZeneca Study of a fluidization process for coating
of pellets (Losec)
Wurster bed
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3. Fluidization for chemical and process
technology (contd.)
Eulerian two-fluid model for gas and particle motion
Kinetic theory of granular flow
Experimental validation vs optical and capacitance probe measurements
Overall flow pattern Particle residence times
Particle dispersion
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4. Transport of particles in gas flow.
(Chalmers)
In collaboration with SCA Hygiene Products
Horizontal pipe flow
Eulerian two-fluid modelling
Hot-film measurements of gas-phase turbulence in dilute suspensions
Optical probe measurements of particle
concentration
Turbulence modification Particle dispersion
Flocculation
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5. Modeling column packing for
chromatography. (Chalmers)
In collaboration with Amersham Biosciences
Particles in liquid
Lagrangian particle tracking
Soft-sphere / hard-sphere models
Eulerian two-fluid modeling
Experiments
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6. Modelling the rheological properties and consolidation of suspensions. (KTH)
In collaboration with STFI
Coating of paper
Two-phase model based on “Stokesian
Dynamics” for studying rheological properties and consolidation of coating
colours
Validation vs rotational viscometer and oscillatory measurements
Brownian
Hydrodynamic
Colloidal
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7. Separation of pulp fibers in a centrifugal field with special application to a
hydrocyclone. (KTH)
In collaboration with STFI
CFD modelling of internal flow
Fiber suspension rheology
Experimental validation
Feed
Fine fraction
Coarse fraction
vr
vθθθθ va
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8. A novel metal spray-forming process. (KTH)
In collaboration with Sandvik
The OSPREY process
Lagrangian particle tracking
Thermal and thermodynamic behaviour of
droplets
Experimental validation
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9. Numerical methods for dispersed two-phase flow equations of Eulerian type.
(KTH)
Development of a robust and efficient numerical method for Euler/Euler
equations
Well-posedness Artificial dissipation
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Background:
great industrial need
weak academic tradition
Experiments
• PIV• PLIF• ...
• hot-film• optical probe• ...
Sub-models
• turbulence• (bio-) chemical reactions• dispersion• particle interaction•...
Numerical methods
Eulerian two-fluid Lagrangian
Industrial Design Tool
Experiments
• PIV• PLIF• ...
• hot-film• optical probe• ...
Sub-models
• turbulence• (bio-) chemical reactions• dispersion• particle interaction•...
Numerical methods
Eulerian two-fluid Lagrangian
Industrial Design Tool
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Results after six years:
seven PhDs
three Licentiates
50 publications
SIAMUF
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Multiphase Process Design
MPD
Vision: create a multidisciplinary research centre with a balance between fundamental and applied research in order to increase expertise in multiphase process and product design Objectives: to do fundamental research in multiphase processes and develop design tools for industry, facilitating the use of simulation tools to develop new products and processes to shorten the time from idea to production
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Multiphase Flow Projects at AM, Chalmers
Fluidization for chemical and process technology (SSF, AstraZeneca)
Transport of particles in gas flow
(SSF, SCA Personal Care)
Modeling column packing for chromatography (SSF, General Electric Healthcare)
Characterization of Beds for Chromatography
(General Electric Healthcare)
Fluidization for Energy Production: Fluid Dynamics and Erosion Corrosion (HTC)
Modelling of turbulent gas-particle flows (STEM,
joint project Dept Mechanics, KTH)
Fundamental modelling and experimental validation of liquid-liquid flows (VR, joint project
Chemical Reaction Engineering, Chalmers)
Fluidized bed coating (SSF CPDC, AstraZeneca, joint project Chemical Engineering Design, Chalmers)
Direct numerical simulation of turbulent gas-solid flow (VR)