The general supercritical heat transfer correlation for vertical up-flow tubes: K number correlation

Heat Transfer Prediction of Supercritical Carbon Dioxide in Vertical Tube Based on Artificial Neural Networks

“…The heat transfer model also changes from NHT to HTD. Supercritical fluid behaves pseudo-boiling instead of single phase heat transfer [26]. Thus, the traditional correlation model by Morky et al [34] has poor prediction performance in the low enthalpy region.…”

“…The experimental loop mainly includes vacuum/injection system, refrigeration system, CO 2 circulation loop, cooling loop, electric heating system and data acquisition system. A detailed description of the experimental system has been given in our previous paper [26]. It is not repeated here.…”

“…T w,in is calculated from the outer wall measurement temperature T w,out by using one-dimensional thermal conduction equation [26]:…”

Insights into the dynamics of supercritical water flow using a two-phase approach

“…It is to be noted that if one can show the existence of pseudoflow boiling, then the concepts and understanding of the extensively explored (Analytically, experimentally, and numerically) boiling physics can be directly employed for SF flow. This implication can be clearly illustrated by the recent work, 23,24 where criteria for the onset of HTD and heat transfer correlations are developed for supercritical FIG. 1.…”

Thermodynamics of supercritical carbon dioxide mixtures across the Widom line

“…The middle temperature of the pseudo-boiling transition corresponds to the Widom line temperature. This concept, originally introduced by Ackerman 45 half a century ago, has been employed recently to quantitatively analyze the liquid-like to gas-like transition of several pure fluids, such as argon 46 , nitrogen 47 , carbon dioxide 48 and water 22,49 .…”