A new heat transfer correlation for supercritical water flowing in vertical tubes

General Assessment of Convection Heat Transfer Correlations for Multiple Geometries and Fluids at Supercritical Pressure

“…Using regression analysis software, the number of dimensionless groups was further reduced, and numerical coefficients and exponents of the general form of the correlation were found and optimized based on the experimental data using the least squares method. Chen and Fang [10] reported that their correlation had the best agreement with the data and was superior to Mokry et al [27]. Chen and Fang [10] did not present parametric trends of the correlation; also the conducted error analysis (though in terms of HTC), in general, did not include a measure of correlation precision error.…”

“…The modified correlation was evaluated; however, error analysis was performed in terms of Nu number not HTC. Chen and Fang [10] compiled 5366 data points from 13 sources. The data were for water flowing vertically upward in a round tube.…”

“…The data were for water flowing vertically upward in a round tube. They calculated the ratio of experimental to predicted HTC by Dittus-Boelter [16]; based on the value of this ratio, Chen and Fang [10] classified each experimental data point in 1 of 3 heat transfer modes: normal, enhanced, or deteriorated heat transfer. Then, the categorized data were used for assessing each of the 20 Nusselt number correlations.…”

“…Then, the categorized data were used for assessing each of the 20 Nusselt number correlations. Chen and Fang [10] also developed a new correlation: they reviewed functional dependence of known correlations and proposed a general form for a SCHT correlation. The proposed form comprised 8 dimensionless groups.…”

“…Several reviews of convective heat transfer correlations at SC pressure have been published, for example, overviews and assessments of supercritical heat transfer (SCHT) correlations against both SC water and SC CO 2 data for tube [2][3][4][5][6][7], an assessment of correlations [8][9][10], and an updated assessment of correlations based on rod bundle water data [11].…”