Chair of Fluid Process EngineeringUniversity of Paderborn

INTHEAT, Veszprém, July 08, 2011

Dipl.-Ing. Mark Piper

Activities of UPB

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

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

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

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

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

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