A Review of Supercritical Carbon Dioxide Heat Transfer and Flow Properties in Pipes

Supercritical carbon dioxide (s‐CO 2 ) has the characteristics of highly efficient and has been used in the engineering field. This article reviews the research progress on the heat transfer and flow properies in s‐CO 2 tubes. To obtain the most accurate heat transfer and friction factor correlations, new correlations derived from experimental data are proposed, and the accuracy of the published correlations is assessed in conjunction with the experimental data. The results show how important variables such as mass flow, inlet temperature, and tube size relate to the properties of pressure drop and heat transfer in pipes that use s‐CO 2 as the work material. The D‐M‐2011 heat transfer correlation had the highest accuracy, with 62.57% of the data having a relative deviation of less than ±20%, and the Wang‐2014 friction factor correlation had the highest accuracy, with 72.91% of the data having a relative deviation of less than ±20%. Considering the dimensionless number correction and segmented function correction to improve the correlation, 82.41% of the data in the new heat transfer correlation have a relative deviation less than ±20% and 83.53% of the data in the new friction factor correlation have a relative deviation less than ±20%.