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Activities of UPB

Activities of UPB. Dipl.-Ing. Mark Piper. 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)

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Activities of UPB

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  1. Activitiesof UPB Dipl.-Ing. Mark Piper

  2. 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

  3. Spacer geometry: characterisation fil fil Filament diameter: 0.5 mm Angle: 65°, 115° Mergence: 0.1 mm Filament diameter: 1.3 mm Angle: 45°, 135° Mergence: 0.6 mm  5 degrees of freedom

  4. 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 Surface and volume meshing

  5. Simulation plan for several spacer geometries Configuration 1 Configuration 2 Configuration 3 Configuration 4 Double 1 Double 2 Type Figure Length fil

  6. Boundary conditions • Characteristic representative simulation element

  7. First simulation results  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

  8. First simulation results  specific pressure loss comparison for the different configurations Configuration 1 Configuration 2 Configuration 3 Configuration 4 Calculated with pressure loss equation Volume flow [l/min] Experiment Makatec • simulated vs. experimental • pressure loss • for Configuration 1 Pressure loss (mbar) Discrepancies that need to be clarified Volume flow [l/min]

  9. 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

  10. Thank you

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