Activities of UPB
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Transcript of Activities of UPB
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Chair of Fluid Process EngineeringUniversity of Paderborn
INTHEAT, Veszprém, July 08, 2011
Dipl.-Ing. Mark Piper
Activities of UPB
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011
Research tasks of UPB
Investigation of velocity and temperature fields with CFD
Determination of HTC and specific pressure loss
Development of design methods: Nu=f(Re,Pr,geometry.); ξ=f(Re,geometry)
Geometry optimisation with regards to heat transfer and pressure loss
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011
Spacer geometry: characterisation
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filfil
Filament diameter: 0.5 mmAngle: 65°, 115°Mergence: 0.1 mm
Filament diameter: 1.3 mmAngle: 45°, 135°Mergence: 0.6 mm
5 degrees of freedom
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011
Computational domain
Selection of a characteristic representative element Geometry approximation with CAD (NX Unigraphics 6.0 - Siemens PLM Software): Initial assumptions: plane channel (curvature neglected), wall temperature asymmetry neglected (external boundaries are adiabatic)Surface and volume meshing with Star-CCM+ (5.04.006)Grid refinement in near wall boundary layer regions
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Surface and volume meshing
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011
Simulation plan for several spacer geometries
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Configuration 1 Configuration 2 Configuration 3 Configuration 4Double 1 Double 2
Length
fil
Type
Figure
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011
Boundary conditions
Characteristic representative simulation element
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011
First simulation results
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CFD-visualisation for double configuration 4: Temperature field on spacer walls and velocity streamlines on the cold side
CFD-visualisation for double configuration 4: Temperature field on the cold side
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011
First simulation results
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Volume flow [l/min]
Volume flow [l/min]
specific pressure loss comparison for the different configurations
Configuration 1
Configuration 2
Configuration 3
Configuration 4
simulated vs. experimental pressure loss for Configuration 1
Discrepancies thatneed to be clarified
Pre
ssur
e lo
ss (m
bar) Experiment Makatec
Calculated with pressureloss equation
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011
Future work
Grid independency study and optimisation Reduction of numerical errors Reduction of cell number (coarse grid where possible)
Simulation studies Variation of spacer geometrical parameters Variation of process parameters: inlet velocities and temperatures
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Chair of FluidProcess Engineering
INTHEAT, 08.07.2011 - 10 -
Thank you