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 0.1aerogel 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

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-40 °C

250°C

17th July 2012

Convection

3. Boundary Conditions

�̇�=h (𝑇 −𝑇 ∞)

with :

. .

Bake-out case

𝑇 ∞=30 °𝐶

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-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 !