Speaker
Description
Supercritical carbon dioxide (sCO2) is characterised by low viscosity and a peak in specific heat capacity near the pseudo-critical point, making it a promising fluid for electronics cooling in the temperature range 31–50°C. However, systematic heat transfer data at the millimetre scale remain scarce, limiting the applicability of existing predictive correlations. The CO2-SASS experimental setup built at CERN enables the measurement of relevant data, expanding the knowledge regarding cooling with carbon dioxide at ambient temperature in compact geometries. Further, connections between supercritical and near-critical subcritical heat transfer (>25 °C) have been previously reported in literature, but are poorly characterised experimentally.
This study will present and discuss a systematic dataset of heat transfer coefficients and pressure drops for both sCO2 and warm subcritical CO2 in a 1 mm diameter pipe across conditions relevant to future detector cooling and electronics thermal management. The dataset provides physical insight into the similarities and differences between the two regimes. In addition, representative practical application cases illustrating the use of carbon dioxide in such conditions will be presented.