General Correlation for Heat Transfer to Gas-Liquid Flow in Vertical Channels

摘要

A general correlation is presented for heat transfer during flow of gas-liquid mixtures flowing in vertical channels prior to dry out. It has been verified with a wide range of data that include upward and downward flow in heated and cooled tubes, annuli, and rectangular channels. The data are from 19 studies and include 14 gas-liquid mixtures with a wide range of properties. The parameters include pressure 1-6.9 bar, temperature 16-115 degrees C, liquid Reynolds number from 2 to 127,231, superficial gas and liquid velocities up to 87 and 13 m/s, respectively, and ratio of superficial gas and liquid velocities 0.03-1630. The 1022 data points are predicted by the new correlation with mean absolute deviation (MAD) of 18.1%. Several other correlations were also compared to the same data and had MAD of 28.6-45.5%.