Numerical Simulation of Gas-Liquid-Reactors with Bubbly Flows using a Hybrid Multiphase-CFD Approach Hybrid Interface Resolving Two-Fluid Model (HIRES-TFM) by Coupling of the Volume-of-Fluid (VOF) method and the Two-Fluid model (TFM) using . Dipl.-Ing. Holger Marschall Chair of Chemical Engineering Technische Universität München TFM TFM VOF VOF
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Numerical Simulation of Gas-Liquid-Reactors with Bubbly Flows
using a Hybrid Multiphase-CFD Approach
Hybrid Interface Resolving Two-Fluid Model (HIRES-TFM)by Coupling of the Volume-of-Fluid (VOF) method
and the Two-Fluid model (TFM)
using .
Dipl.-Ing. Holger MarschallChair of Chemical Engineering
Technische Universität München
TFMTFM
VOFVOF
CFD in Chemical Reaction Engineering V – June 15-20, 2008 2
Outline
Background & Motivation • Problem Statement • Governing Equations • Numerical Results • Outlook
• background & motivation
• problem statement§ state-of-the-art (VOF & TFM)§ hybrid approach (HIRES-TFM)
CFD in Chemical Reaction Engineering V – June 15-20, 2008 3
BackgroundPhenomenology of Multiphase-Flows – Process Technology
Background & Motivation • Problem Statement • Governing Equations • Numerical Results • Outlook
spray
droplet flow
churn flow
stratified flow
dense bubbly flow
dilute bubblyflow
smoke flow
dust flow
dilute particle flow
dense particle flow
granular flow
fluidized bed
sedimentation
fixed bed
solid fixed
solid in motion
gas/liquid flow
gas/solid flow
liquid/solidflow
porous medium
liquid solid
gas
solid fixedsolid in motion
[Laurien, 2004]
CFD in Chemical Reaction Engineering V – June 15-20, 2008 4
MotivationPhenomenology of Multiphase-Flows – Bubble Column Reactors
Background & Motivation • Problem Statement • Governing Equations • Numerical Results • Outlook
&GV
[Fan, 1990], [Mudde, 2003]
CFD in Chemical Reaction Engineering V – June 15-20, 2008 5
MotivationPhenomenology of Multiphase-Flows – Bubble Column Reactors
Background & Motivation • Problem Statement • Governing Equations • Numerical Results • Outlook
[Fan, 1990], [Mudde, 2003]
§ fluid dynamics of two-phase flow systems in process apparatus and chemical reactors with transient flow structures
§ fluid dynamics, reaction andmass transfer at gas-liquidinterfaces of two-phase flow systems with spatial and/ortemporal scales over more than 6 orders of magnitude
CFD in Chemical Reaction Engineering V – June 15-20, 2008 6[Deckwer, 1985], [Fan, 1990]
reactor inletmodelling, empiricism
reactor interiorflow structure n reactor performance
requirements§ Higher Accuracy, Cutback of Conservatisms & Uncertainties§ Portability to New Geometries and Range of Parameters§ Enhanced Scale-Up Options
Problem Statement State-of-the-Art – Current Frontiers
Background & Motivation • Problem Statement • Governing Equations • Numerical Results • Outlook
- porous plates, perforated plates, single orifice nozzles
CFD in Chemical Reaction Engineering V – June 15-20, 2008 20
Thanks for your attention…
Background & Motivation • Problem Statement • Governing Equations • Numerical Results • Outlook
• Acknowledgements
– Prof. Dr.-Ing. Olaf Hinrichsen & Prof. Wolfgang Polifke (TU München)– Dr. Henry G. Weller (OpenCFD Ltd.)– Prof. Dr. Hrvoje Jasak (FSB Zagreb, Wikki Ltd.)
• Contact
Dipl.-Ing. Holger MarschallLehrstuhl I für Technische ChemieTechnische Universität MünchenLichtenbergstr. 4D-85747 Garching