Abstract
The convective heat transfer characteristics of sCO2 in a horizontal U-tube are numerically investigated in this work. Considering the special geometry design of U-tube and the great variation of the supercritical fluid (SCF) properties, the reliability of four turbulence models is verified. Effects of operation parameters, buoyancy, flow acceleration and centrifugal force on the heat transfer characteristics are further investigated. Results show that, the position where the Tb is close to the Tpc has an important influence on the heat transfer. Centrifugal force mainly enhances the heat transfer coefficient (HTC) in the U-section and the outlet-section, and restrains the buoyancy and flow acceleration effect. The competition between buoyancy and centrifugal force leads to the enhancement of secondary flow and heat transfer. Finally, new heat transfer correlations which can be used in U-section and outlet-section are proposed in this paper.
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