Experimental Study on Heat Transfer to Supercritical Water Flowing in Circular Tubes

The experimental studies on heat transfer to supercritical water flowing upward and downward in circular tubes were carried out at the SWAMUP test facility, and the phenomena of normal heat transfer, heat transfer deterioration (HTD) and enhancement heat transfer were recorded. Test results show that HTD caused by buoyancy effect only appears in upward flow and HTD caused by acceleration effect appears both in upward flow and downward flow. In addition, several dimensionless numbers which widely apply in heat transfer correlations are assessed. It is concluded that the dimensionless number Bu and π_A show unique effect on heat transfer coefficient.