Abstract
An experimental investigation on heat transfer deterioration and the discussion of visualized flow states for supercritical CO2 flow in a non-circular channel were here proposed. A significant blurred shadow, induced by local density variations, was photographed in near heated wall region as heat transfer deterioration occurred. The blurred shadow qualitatively showed the special flow changes of supercritical fluids. The effects of system parameters were studied and the heat transfer correlations were evaluated by obtained experimental data. Three Dittus-Boelter type correlations showed better predictions, while the semi-empirical correlation with physical meaning showed the worst. Combined with the analysis of buoyancy, a modified heat transfer correlation for present experiments was suggested and it was compared with that for tube flows. The experimental findings and visualized flow state may further strengthen the understanding on supercritical heat transfer and extend the researches of supercritical fluids in non-circular channels.
Published Version
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