Advanced European Infrastructures for Detectors at Accelerators News

Pressure drop database 3 Inner Diameters 9 Saturation Temperatures 5 Heat Fluxes 11 Mass

Heat transfer database 3 Inner Diameters 9 Saturation Temperatures 5 Heat Fluxes 11 Mass

Models: Pressure Drop 28 existing models for the prediction of the Pressure Drop checked

Models: Heat Transfer 33 existing models for the prediction of the Heat Transfer Coefficient

“Best Dp models”: behavior EXAMPLE: eﬀect of Saturation Temperature on the applicability of prediction

“Best HTC models”: behavior EXAMPLE: eﬀect of Saturation Temperature on the applicability of prediction

Outreach D. Hellenschmidt, P. Petagna, Eﬀects of saturation temperature on the boiling properties of

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Advanced European Infrastructures for Detectors at Accelerators News from CERN: CO 2 boiling in mini-pipes April 2 nd 2019 FINAL AIDA-2020 Annual Meeting Apr 28 th – 30 th 2020 Paolo Petagna & Desiree Hellenschmidt This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 654168.

Pressure drop database 3 Inner Diameters 9 Saturation Temperatures 5 Heat Fluxes 11 Mass Fluxes Combined effect of mass flux, heat flux and saturation temperature on pressure drop for the 3 Inner Diameters (only Max and min are shown for heat flux and temperature) 26 May 2021 FINAL AIDA-2020 Annual Meeting Oxford, Apr 28 th – 30 th 2020 2

Heat transfer database 3 Inner Diameters 9 Saturation Temperatures 5 Heat Fluxes 11 Mass Fluxes Example of the effect of the Saturation temperature on the Heat Transfer Coefficient as a function of vapour quality for the 3 Inner Diameters (one Mass flux and Max heat flux are shown for example) 26 May 2021 FINAL AIDA-2020 Annual Meeting Oxford, Apr 28 th – 30 th 2020 3

Models: Pressure Drop 28 existing models for the prediction of the Pressure Drop checked against an experimental database of 900 points 325 Dp values for ID nominal = 2. 15 mm 405 Dp values for ID nominal = 1 mm 180 Dp values for ID nominal = 0. 5 mm 26 May 2021 FINAL AIDA-2020 Annual Meeting Oxford, Apr 28 th – 30 th 2020 4

Models: Heat Transfer 33 existing models for the prediction of the Heat Transfer Coefficient checked against an experimental database of 10, 800 points 3780 HTC values for ID nominal = 2. 15 mm 4860 HTC values for ID nominal = 1 mm 2160 HTC values for ID nominal = 0. 5 mm 26 May 2021 FINAL AIDA-2020 Annual Meeting Oxford, Apr 28 th – 30 th 2020 5

“Best Dp models”: behavior EXAMPLE: eﬀect of Saturation Temperature on the applicability of prediction methods at ≈ 35 k. W/m 2 for the 3 Inner Diameters 26 May 2021 FINAL AIDA-2020 Annual Meeting Oxford, Apr 28 th – 30 th 2020 6

“Best HTC models”: behavior EXAMPLE: eﬀect of Saturation Temperature on the applicability of prediction methods at ≈ 35 k. W/m 2 for the 3 Inner Diameters 26 May 2021 FINAL AIDA-2020 Annual Meeting Oxford, Apr 28 th – 30 th 2020 7

Outreach D. Hellenschmidt, P. Petagna, Eﬀects of saturation temperature on the boiling properties of carbon dioxide in small diameter pipes at low vapour quality: pressure drop Submitted to Int. J. Heat Mass Transf. D. Hellenschmidt, P. Petagna, Eﬀects of saturation temperature on the boiling properties of carbon dioxide in small diameter pipes at low vapour quality: heat transfer coefficient In preparation for submission to Int. J. Heat Mass Transf. ALL DETAILS: Desiree Hellenschmidt, Experimental studies on small diameter carbon dioxide evaporators for optimal silicon pixel detector cooling Ph. D Thesis, defence being prepared (Available on CDS after defence) 26 May 2021 FINAL AIDA-2020 Annual Meeting Oxford, Apr 28 th – 30 th 2020 8