Investigation reports improved heat transfer in vertical mini square channels using supercritical carbon dioxide, suggesting new predictive correlations.
Key Points
This work aims to investigate the heat transfer characteristics of supercritical carbon dioxide in vertical mini square channels.
Conducted experiments using a 1.6 × 1.6 mm2 vertical square channel.
Analyzed the effects of varying pressure, mass flux, and heat flux on heat transfer.
Divided sCO2 flow heat transfer into liquid-like, two-phase-like, and vapor-like regions.
Upward flow of sCO2 showed a higher heat transfer coefficient compared to downward flow.
Buoyancy and thermal acceleration had minor effects on heat transfer.
Established a new predictive heat transfer correlation for vertical mini square channels with a deviation of within -20% to +30% from experimental data.