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DT Training Seminars
Two-phase micro-channel cooling R&D at CERN
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Europe/Zurich
32/1-A24 (CERN)
Description
Thermal management needs of future silicon detectors are steadily increasing. Yet, the mass and volume minimization of all ancillaries in a detector is more and more demanding: this calls for highly effective active cooling in very small channels.
Due to its many favourable thermo-physical properties, CO2 in boiling state has been adopted as preferred refrigerant for the future generations of silicon detectors at LHC. However, available data about CO2 boiling in channels of Inner Diameter (ID) below 3 mm are too limited – and often affected by too large measurement uncertainties – to allow for developing reliable predictive models of Heat Transfer Coefficient and pressure drop in the conditions of interest for the thermal management of LHC silicon detectors.
After a brief introduction providing the audience with basic definitions, the fundamental issues of general research on boiling flows at mini- and micro-scales will be discussed. The EP-DT R&D programme on state-of-the-art characterization of the properties of CO2 boiling in small diameter channels, ranging from 2 mm to 100 microns ID, will be introduced, and the objectives of the new ad-hoc developed experimental test set-up will be presented. Finally, an example of the first results being produced will be shown and briefly discussed.