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Megapie Project. CRS4 report CEA, Cadarache February, 26 th 2002. Pin-cooler simulation. Spiral effect study on a simplified 3D simulation. Geometrical characteristics. Pass (h) 85 mm Height (H) 510 mm Spiral diameter (Sd) 1.5 mm Oil annulus internal diameter D 47 mm

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megapie project

Megapie Project

CRS4 report

CEA, Cadarache

February, 26th 2002

pin cooler simulation

Pin-cooler simulation

Spiral effect study on a simplified 3D simulation

geometrical characteristics
Geometrical characteristics
  • Pass (h) 85 mm
  • Height (H) 510 mm
  • Spiral diameter (Sd) 1.5 mm
  • Oil annulus internal diameter D 47 mm
  • Oil annulus width (dr1) 2.1 mm
  • Steel wall width (dr2) 1.5 mm
  • PbBi annulus width (dr3) 4.25 mm
  • Spiral angle over horizontal plane () 30o
flow characteristics
Flow characteristics
  • PbBi inlet: 4/12 l/s at 360 C
  • Diphyl THT oil: 10/12 l/s at 100 C
pin cooler simulation1

Pin-cooler simulation

Full 3D simulation with spiral separator in the rising oil channel.

flow characteristics1
Flow characteristics
  • PbBi inlet: 4 l/s at 360 C
  • Diphyl THT oil: 10 l/s at 100 C
  • Power exchanged: 64 kW
  • PbBi: DP=108 kPa for Dz=1.382 m
  • Diphil THT Oil (rising column): 170 kPa for Dz=1.402 m
simulation features
Simulation features
  • About 2 millions cells, 1.3 million for Oil
  • Spiral: 15 loops with 85 mm gap
  • Non matching regions inside oil region and in solid.
  • Chen variant of k-e model
  • Wall functions for PbBi
  • Two layers for Oil
ultimate changes
Ultimate changes
  • Spiral diameter from 1.5 to 1.6mm
  • Spiral orientation (indirect triad)
  • Spiral in-lining
  • Partial account for the 1mm diameter thermo-couple wires
  • Thermo-couples positioning
  • Separation of upper LBE region
  • Main non-matching transition from steel to LBE
run features
Run features
  • Parallel execution on 7 SP3 processors
  • Typical runtime: 12 hours
  • Steady state solutions
  • Variable turbulent Prandtl number
  • Modification of LBE wall functions
wall function and pr modifications effect
Wall function and Pr modifications effect
  • Modified wall functions increase heat exchange
  • Modified Prt decrease heat exchange
conclusions
Conclusions
  • Numerical simulation led to individuate a problem in proximity of the LBE inlet gap.
  • Total heat exchange is controlled by the global mass flow rates independently of small geometrical perturbations and is extremely well reproduced.
  • The spiral wire seems to introduce a strong sensibility of the Oil pressure losses to small geometrical perturbations.
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