CFD thermal simulations IBL Enrico Da Riva AnneLaure

CFD thermal simulations IBL Enrico Da Riva, Anne-Laure Lamure 14 th August 2012 E. Da Riva, A. L. Lamure 1

A. Geometry, materials and boundary conditions 1. Beam Pipe and insulation 2. IBL staves 3. Boundary conditions 4. CFD simulations settings 14 th August 2012 E. Da Riva, A. L. Lamure 2

1. Beam Pipe, insulation and IPT Thickness [mm] Outer Diameter [mm] Thermal conductivity [ W K-1 m-1] Elements Material beam pipe berylium 0. 8 48. 6 Heaters polyimide with stainless steel 0. 2 49 0. 1 kapton 2 layers polyimide 0. 12 49. 24 0. 1 aerogel silicat aerogel kapton 2 layers polyimide 0. 12 0. 1 aluminium foil aluminum 0. 05 222 Gap nitrogen 0. 025 58 Section 14 th August 2012 0, 2, 4 0. 0242 Thermal Inner Diameter Thickne conductivity ss [W K-1 m-1] mm mm Pixel Area 58 0. 325 Services area 58 0. 5 E. Da Riva, A. L. Lamure 2. 2 3

2. IBL staves MATERIALS OMEGA (Carbon Fiber) CARBON FOAM (K 9) TITANIUM PIPE (i. d. 1. 5 mm) CARBON-FOAM/CARBON-FIBER GLUE CARBON-FOAM/PIPE GLUE CHIP/CARBON-FIBER GLUE CHIP (silicon) BONDING (tin + 3. 5% argent) SENSOR (silicon) INNER SUPPORT TUBE – IST (Carbon fiber) Thickness [μm] 150 100 200 70 250 300 200 Thermal Conductivity [W m-1 K-1] 2. 2* 25 7. 2 1** 1*** 148 6. 32 148 1000 2. 2* Assumed as isotropic Stycast 2850 FT, 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 14 th August 2012 E. Da Riva, A. L. Lamure 4

3. Boundary Conditions Bake-out case -40 °C Convection with : 250°C 5 17 th July 2012 E. Da Riva, A. L. Lamure

3. Boundary Conditions Nominal case -40 °C Convection with : Adiabatic 100 W / stave 6 17 th July 2012 E. Da Riva, A. L. Lamure

4. CFD simulations settings - Nitrogen flow rate =0 kg/s - Natural convection of nitrogen taken into account - Radiative heat 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 14 th August 2012 E. Da Riva, A. L. Lamure 7

B. CFD Simulations 1. Bake-out case 2. Nominal case 3. Summary table 14 th August 2012 E. Da Riva, A. L. Lamure 8

1. Bake-out Insulation : 0 mm 14 th August 2012 E. Da Riva, A. L. Lamure 9

1. Bake-out Insulation : 2 mm 14 th August 2012 E. Da Riva, A. L. Lamure 10

1. Bake-out Insulation : 4 mm 14 th August 2012 E. Da Riva, A. L. Lamure 11

2. Running nominal Insulation : 0 mm 14 th August 2012 E. Da Riva, A. L. Lamure 12

2. Running nominal Insulation : 2 mm 14 th August 2012 E. Da Riva, A. L. Lamure 13

2. Running nominal Insulation : 4 mm 14 th August 2012 E. Da Riva, A. L. Lamure 14

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 14 th August 2012 E. Da Riva, A. L. Lamure 15