The cooling efficiency of s‐CO₂ microchannel heat sink compared with a water‐based design

High-pressure drops characteristic of microchannel heat sinks (MCHS) is an issue that needs to be addressed reduce the size heat-removing devices in compact electronic devices. Supercritical carbon dioxide (s-CO₂) a suitable candidate being proposed as alternative coolant enhance cooling sink (MCHS), with high flux, due its favorable thermophysical properties near critical point. In this study, numerical simulations are conducted evaluate thermal and hydraulic performance channel for designed s-CO₂ (at constant P = 8 MPa $$ P=8\ \mathrm{MPa} ) compare it conventional liquid (water). The effect coolants mass flow rate ( m ̇ \dot{m} ), aspect ratio (AR), inlet temperatures on one studied by varying from 0.004 0.03 kg/s AR 0.33 10. results show that, same ratio, geometry, offers higher overall transfer coefficient (32%) lower friction factor (pumping power) compared water at temperature (T 32°C). pumping power comparison between two reveal CO₂ supercritical conditions , T 32°C), consumed varies change which 1.85 times than 3.6 However, subcooled state, reverse seen.