14th August 2012 1E. Da Riva, A.L. Lamure
CFD thermal simulationsIBL
Enrico Da Riva, Anne-Laure Lamure
14th August 2012
14th August 2012 2E. Da Riva, A.L. Lamure
A. Geometry, materials and boundary conditions
1. Beam Pipe and insulation
2. IBL staves
3. Boundary conditions
4. CFD simulations settings
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1. Beam Pipe, insulation and IPT
Elements MaterialThickness [mm]
Outer Diameter [mm]
Thermal conductivity [ W K-1 m-1]
beam pipe berylium 0.8 48.6
Heaterspolyimide with stainless steel 0.2 49 0.1
kapton 2 layers polyimide 0.12 49.24 0.1
aerogel silicat aerogel 0,2,4 0.025
kapton 2 layers polyimide 0.12 0.1
aluminium foil aluminum 0.05 222
Gap nitrogen 58 0.0242
SectionInner Diameter
Thickness
Thermal conductivity [W K-1 m-1]
mm mmPixel Area 58 0.325
2.2Services area 58 0.5
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2. IBL stavesCARBON FIBER CARBON FOAM TITANIUM PIPE 200 μm GLUE CARBON-FOAM/OMEGA
CARBON-FOAM/PIPE
GLUECHIP
BONDING
SENSOR
MATERIALS
Thickness
[μm]
Thermal Conductivity
[W m-1 K-1] OMEGA (Carbon Fiber) 150 2.2*
CARBON FOAM (K9) - 25 TITANIUM PIPE (i.d. 1.5 mm) 100 7.2 CARBON-FOAM/CARBON-FIBER GLUE 200 1**
CARBON-FOAM/PIPE GLUE 200 1**
CHIP/CARBON-FIBER GLUE 70 1***
CHIP (silicon) 250 148 BONDING (tin + 3.5% argent) 300 6.32 SENSOR (silicon) 200 148 INNER SUPPORT TUBE – IST (Carbon fiber)
1000 2.2*
* Assumed as isotropic** Stycast 2850FT, manufacturer declared value: 1.02 W m-1 K-1
*** Electrolub HTCP, manufacturer declared value: 2.5 W m-1 K-1
- Perfect thermal contact between different layers in the CFD simulations
E. Da Riva, A.L. Lamure 5
-40 °C
250°C
17th July 2012
Convection
3. Boundary Conditions
�̇�=h (𝑇 −𝑇 ∞)
with :
. .
Bake-out case
𝑇 ∞=30 °𝐶
E. Da Riva, A.L. Lamure 6
-40 °C
Adiabatic
17th July 2012
Convection
3. Boundary Conditions
with :
. .
Nominal case
�̇�=h (𝑇 −𝑇 ∞)
𝑇 ∞=30 °𝐶
100W / stave
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4. CFD simulations settings
- Nitrogen flow rate =0kg/s
- Natural convection of nitrogen taken into account
- Radiative heat transfer transfer taken into account (emissivity
of 0.05 for the Beam Pipe, 1 for other surfaces)
- Dependence of nitrogen properties on temperature taken into
account
- Laminar natural convection flow
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B. CFD Simulations
1. Bake-out case
2. Nominal case
3. Summary table
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1. Bake-out
Insulation : 0mm
-36°C
76°C
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1. Bake-out
Insulation : 2mm
-36°C
53°C
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1. Bake-out
Insulation : 4mm
-36°C
47°C
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2. Running nominal
Insulation : 0mm
-17°C
-26°C
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2. Running nominal
Insulation : 2mm
-17°C
-26°C
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2. Running nominal
Insulation : 4mm
-17°C
-26°C
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3. Summary table
Geometry Case Insulation Temperature
Tsensor max T IPT max
convect
mm °C °C
IBL Only Bake-Out 0 -36 76
IBL Only Bake-Out 2 -36 53
IBL Only Bake-Out 4 -36 47
IBL Only Nominal 0 -17 -26
IBL Only Nominal 2 -17 -26
IBL Only Nominal 4 -17 -26
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C. Comparison with previous results
1. Bake-out case
2. Nominal case
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Summary table
Geometry Case InsulationT∞ T IPT max
convect + IPT convect adiabmm °C °C °C
IBL Only Bake-Out 0 30 -36 76IBL Only Bake-Out 2 10 -37 -36IBL Only Bake-Out 2 30 -36 -37 -36 53IBL Only Bake-Out 2 60 -37 -36IBL Only Bake-Out 4 30 -36 47IBL Only Nominal 0 30 -17 -26IBL Only Nominal 2 10 -24 -25IBL Only Nominal 2 30 -17 -23 -25 -26IBL Only Nominal 2 60 -22 -25IBL Only Nominal 4 30 -17 -26Services Bake out 2 10 -30 -31Services Bake out 2 30 -28 -31Services Bake out 2 60 -25 -31Services Bake out safe 2 10 46 48Services Bake out safe 2 30 51 48Services Bake out safe 2 60 60 48Services Nominal 2 10 7 8Services Nominal 2 30 22 8Services Nominal 2 60 41 8
TemperatureTsensor max
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Thank you for your attention !