The heat transfer of supercritical water flow is deemed to be
normal when 0:3 6 R 6 1, deteriorated when R < 0.3, and improved
when R > 1. Based on this criterion, the 5366 experimental data
points are divided into three regimes as shown in Fig. 1, from
which it can be seen that 3430 points (63.9%) are in the normal
heat transfer regime, 1267 points (23.6%) in the improved heat
transfer regime, and 669 points (12.5%) in the deteriorated heat
transfer regime. As can be seen in Fig. 1, a peak in heat transfer
coefficients near the critical and pseudo-critical points was
recorded and most of the improved and deteriorated data points
appeared near the pseudo-critical points.