Understanding the heat transfer features of supercritical water is one of the most critical issues in the development of Supercritical Water-Cooled Reactors (SCWRs). This review article provides a state-of-the-art description of the thermal-hydraulics performance of water flowing at supercritical pressures in tubes with wire-wrapped rod bundles and attempts to gain a fundamental understanding of the unique characteristics. Experimental and numerical research relevant to the supercritical water heat transfer in sub-channels with wire-wrapped rod bundles is reviewed. Supercritical pressure, thermo-physical properties of water, and relevant parametric effects (e.g., effects of mass flux, heat flux, pressure) are outlined on heat transfer performance. The reliability of turbulence models and the simulation of the buoyancy and turbulent heat flux remain major challenges. Therefore, the transfer of heat of supercritical water under SCWR operating conditions with helical wire as a spacer requires further research.
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