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Upgrade Thermal Management Workshop September 6 th 2006 Bdg 40 Sara Eicher, Michele Battistin

Investigate moisture removal and CO2 circulation in LHC detectors through CFD simulations. Evaluate drying and flushing processes with nitrogen and CO2. Analyze temperature and flow distributions for optimal performance.

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Upgrade Thermal Management Workshop September 6 th 2006 Bdg 40 Sara Eicher, Michele Battistin

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  1. CFD Calculations for the ATLAS Upgrade Upgrade Thermal Management WorkshopSeptember 6th 2006Bdg 40Sara Eicher, Michele Battistin 6th September 2006

  2. CFD Projects on the Inner Detectors of Experiments • CMS Tracker Outer Barrel • ATLAS Inner Tracker • ALICE Inner Tracking System 6th September 2006

  3. Moisture Removal in the CMS TOB with Nitrogen(Nicola Gatti, EDMS 503499) 6th September 2006

  4. Moisture Removal in the CMS TOB with Nitrogen(Nicola Gatti, EDMS 503499) The Problem - TOB contains silicon sensors which are very delicate and deteriorate rapidly with temperatures above -10°C; - CMS must undergo a drying and cooling process before starting to work; - Drying phase serves to avoid condensation of steam and possible ice formation; nitrogen, which has a dew point of -70°C is used; Objective: To evaluate the effect of number and location of inlet/outlet conditions on the overall drying time 6th September 2006

  5. Moisture Removal in the CMS TOB with Nitrogen(Nicola Gatti, EDMS 503499) The CFD Model • Transient, 2D Model • 10 kcells • Isothermal • Laminar flow • Constant molecular properties • Nitrogen taken as dry air Geometry and Mesh 6th September 2006

  6. Moisture Removal in the CMS TOB with Nitrogen(Nicola Gatti, EDMS 503499) Results Drying time: 5.5 hrs Preferential flow distribution Drying time: 3 hrs Good flow distribution Drying time: 2.2 hrs Bad flow distribution 6th September 2006

  7. Analysis of the CO2 Circulation in the ATLAS Inner Tracker(I. Wichrowska-Polok, EDMS 591951) ATLAS 6th September 2006

  8. Analysis of the CO2 Circulation in the ATLAS Inner Tracker(I. Wichrowska-Polok, EDMS 591951) The Problem - TRT operates in a Xe-CO2-O2 mixtureat room temperature; - SCT and Pixel operate in a nitrogen environment at -7°C temperature; - The remaining ID volume is flushed with 10m3/h of dry CO2; - Dry CO2 serves to keep relative humidity below 1% and avoid nitrogen leakages from SCT and Pixel enclosures into the ID volume Objective: To evaluate the effect of location of inlet conditions on the overall flushing time To estimate the evolution in time of CO2 concentration in the ID volume 6th September 2006

  9. Analysis of the CO2 Circulation in the ATLAS Inner Tracker(I. Wichrowska-Polok, EDMS 591951) The CFD Model • Transient, 3D Model • 1800 kcells • Isothermal • Turbulent k-ε model 6th September 2006

  10. Analysis of the CO2 Circulation in the ATLAS Inner Tracker(I. Wichrowska-Polok, EDMS 591951) The CFD Model 4 3 3a 6 TRT barrel 1 TRT endcap 2 • 6 inlets per half geometry TRT barrel SCT endcap SCT barrel 5 Pixel 6th September 2006

  11. 120 minutes 14 minutes Analysis of the CO2 Circulation in the ATLAS Inner Tracker(I. Wichrowska-Polok, EDMS 591951) Results CO2 Distribution 6th September 2006

  12. Analysis of the CO2 Circulation in the ATLAS Inner Tracker(I. Wichrowska-Polok, EDMS 591951) Results Dew point variation with CO2 concentration in the ID volume Average concentration of CO2 in the ID volume during flushing period 6th September 2006

  13. CFD Study of the ALICE Inner Tracking System Thermal Behaviour(Anna Mueller, EDMS 592558) TPC T0 ALICE FMD FMD SPD SDD SSD 6th September 2006

  14. CFD Study of the ALICE Inner Tracking System Thermal Behaviour(Anna Mueller, EDMS 592558) The Problem - ALICE Inner Tracking System (ITS) is made up of 3 different detectors: SPD, SDD, and SSD; - ITS sits in a very confined area which also contains the Forward Muon (FMD) and T0 detectors; - There is heat dissipation from cables and electronics in the ITS area; - Around the ITS will be placed the Time Projection Chamber (TPC) which is very sensitive to temperature variations; Objective: To determine a suitable ventilation configuration able to remove the heat generated in the ITS surroundings 6th September 2006

  15. CFD Study of the ALICE Inner Tracking System Thermal Behaviour(Anna Mueller, EDMS 592558) The CFD Model • Steady-state, 3D Model • 700 kcells • Mixed convection • Heat dissipation from SPD, SDD, SSD cables and FMD, T0 detectors • Inlets positioned on C side Geometry and Mesh detail 6th September 2006

  16. CFD Study of the ALICE Inner Tracking System Thermal Behaviour(Anna Mueller, EDMS 592558) Results Case 2 No Dissipation FMD, T0 147 W Case 1 Full Dissipation 250 W 6th September 2006

  17. Summary • CFD have been applied to study the inner tracker detectors of LHC experiments (CMS, ATLAS, ALICE); • Main investigations deal with determination of temperature, flow and concentration distributions; • 2 and 3D models under transient and steady-state conditions were used 6th September 2006

  18. Conclusions • Large improvement of CFD in accuracy and performance • CFD can provide insight into fluid flow and heat transfer problems when no resources are available for experimental techniques and prototypes 3D 3000 kcells Year 2006 2D 100 kcells Year 2000 6th September 2006

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