Progress on the Development of a Look-up Table for Trans-critical Heat Transfer in Water-cooled Heated Tubes

Abstract

A skeleton table has been constructed from the best prediction methods. This table describes the convective heat transfer coefficient as a function of pressure, mass flux, wall superheat (i.e., the difference between wall and bulk temperatures) and fluid enthalpy. The table has been updated by including all experimental data available to date in suitably normalized forms. Discontinuities in the variations in heat transfer coefficient with the table parameters have been removed. The parametric trends of the skeleton table, the updated table and the smoothened table have been assessed and compared to experimental data. The results of statistical error analyses are presented in this paper. It was found that the uncertainty in predicting the heat transfer coefficient using the present trans-critical look up table is much lower than that of the assessed correlations for all trans-critical sub-regions.